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Патент USA US2411387

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Nov. 19, 1946.
T. PAsçoE ET AL
RAILWAY TRAFFIC CONTROLLING APPARATUS
Filed Dec. 8, 1944
.
I
a
2,43 i587
2,411,387
Patented Nov. 19, 1946
UNITED STATES PATENT oFFlcE
2,411,387
RAILWAY TRAFFIC CONTROLLING
APPARATUS
Frank T. Pascoe, Carnegie, and Arthur L. Jerome,
Edgewood, Pa., assignors to The Union Switch
& Signal Company, Swìssvale, Pa., a corpora
tion of Pennsylvania
Application December 8, 1944, Serial No. 567,188
17 Claims. (Cl. 246-3)
1
Our invention relates to railway tral'lic con
2
A further object of the invention is t'o provide
circuits for use in centralized traiìc control ma
chines for remote control of tr‘aiiic in track
apparatus of the type described which operates
to prevent improper changes in the designated
trafñc direction following movement of the
stretches in which trañic may move in either Ul
switch lock lever.
trolling apparatus and particularly to improved
'
_
direction.
In Figpl of application for Letters Patent of
the United States, Serial No. 501,254 of H. S.
Young, filed September 4, 1943, there are shown
Another object of the invention is to provide
improved apparatus of the type described which
is arranged so that the operator’s control of the
traffic direction relay for; a track stretch is4 cer
track stretch, so as to prevent interference with
been sent to the central oñîce. _
interlocked circuits at the control oñice gov 10 tain to be terminated after occupancy of the
stretch even though the stretch becomes occu
erned by the signal control levers which govern
pied beiore block` clear indication codes have
train movements into the opposite ends of a
Y
Other objects of the invention and features
train movements in the event ot improper
manipulation of these levers and to prevent the 15 of novelty will be apparentfrom the following
description taken in connection with the accom
reversal of the direction of tralîlic except when
panying drawing;
the single track stretch is unoccupied and the
We shall describe one form of railway traffic
signals governing entrance oi trañic into the
controllingl apparatus embodying our invention,
stretch ane at stop.
,
An object of our invention is to provide an 20 together with a modiñcation thereof which ‘We
may employ, and shall then point out the novel
improved system of the type described which
features thereof in claims.
`
.
upon operation of the office equipment to permit
In practicing our invention- we provide a
a change in the direction of traiiic promptly
master directional relay of the polar stick type
cancels the existing block indications.
A further object of our invention is to provide 25 for designating the direction oi traii'lc in each
track stretch‘and provide circuits governed by
an improved system of the type described which
the levers controlling the signals at the entrance
upon operation of the oiiîce equipment to permit
ends of the stretch for operating the relay con
a change in the direction of traino prevents re
tacts to one position or the other providing the
sponse of selected indication relays to indication
stretch is vacant andthe signals are at stop.
codes until control codes have been sent to both ‘
Contacts oi this ‘directional relay control the
ends of the stretch to condition the equipment
polarity of the' energysupplied to a neutral
in the neld to establish traflic in the direction
auxiliary stick relay so that this relay always
determined by the oflice equipment.„`
releases on movement of the contacts of the di
Another object of our inventio‘r‘iis to‘ provide
an improved system of the type described which ‘ rectional relay. The auxiliaryl relay when re
leased energizes the block indication relays to
upon operation of the oiiicel equipment to permit
cancel the existing " indications and prevent
a `change'in the- direction oi tr‘añ‘ic promptly
registration of new indications, while the auxil
establishes circuits for the starting relays gov
iary relay when released VenergiZes a block re
erning transmission of control codes to opposite
ends of the lstretch t'oiihsure` that control codes 40 peater stick relay which establishes circuits for
will be transmitted to both ends oi the stretch
the starting relays to insure transmission of con
to thereby make `certain that the wayside ap
paratus will prepare the stretch for traffic in the
direction determined by the oñic‘e equipment.
trol codes to both ends `oi the stretch and also
provides a circuit for the directional relay to
permit the relay to be operated pending estab
rupt these circuits for the starting relays.
Another object of the invention is to' provide
improved apparatus ofthe type described for use
the‘wayside apparatus has established traffic in
A furtherA object ofthe invention is to provide 45 lishment of traiiic in the stretch. The auxiliary
relay, when released, is picked up upon ener
an improved system of the type described which
gization of the starting relays for b_oth ends of
operates to maintain the circuits for the start»
the stretch. The stick circuit for the block re
ing relays until the wayside apparatus prepares'
peater relay is interrupted on receipt of indica--Y
the stretch for traffic in the direction designated
by the o?ñce equipment and to `thereupon inter 50 tion- codes from the field stations showing that
the designated direction or on receipt of an in
dication code showing that a detector sectionV is
occupied, thus showing that a- train has entered
where there is an electrically locked switch at
55 theV stretch. The switch lock` lever governs the
an intermediate pointA in a track stretch.
3
2,411,387
block repeater relay and the block indication
relays to insure proper operation of the equip
ment on movementl of this lever.
In the drawing,
Fig. 1 shows a portion of a suitable machine
4
channels provide communication at different
times with all of the stations.
The explanation of this invention requires only
four channels employed in the transmission oi
control codes and live channels employed in the
located at a control oiiice and including control
panels for two iield stations located at opposite
ends of a single track block, as indicated by the
transmission of indication codes, and in order to
simplify the disclosure the other channels and
related apparatus have not Ibeen shown.
miniature track diagram at the top of the view,
The channels employed in the transmission oi
and
.
10 control codes are designated 2, i, 5 and l, and
Figs. 2 and 3 are fragmentary views showing y the channels employed in the transmission of in
modifications which we may employ.
dication codes are designated III, I2, it, I4 and
Similar reference characters refer to similar
l5, the numbers employed to designate ~these
parts in each of the three views.
'
lchannels being the same as are employed to
In most instances in the drawing the relay con 15 designate the' corresponding channels in the
tacts are located directly under the winding of
above-identified application of H. S. Young.
the associated relay, but in some cases, in order
, It is to be understood that the system of our
to simplify the drawing, relay contacts are sepa
invention is made up of a number of unit portions
rated from the relay winding and in these in
generally similar to the one shown in the draw
stances the relay withwhich the contacts are 20 ing, but, as the invention may be fully understood
from one such portion, only one has been illus
associated is designated by appropriate reference
trated'in the drawing.
characters placed above the contacts.
The equipment at each ñeld station includes a
The office and the field stations are each pro
starting relay, not shown, which responds to a
vided with a suitable source of direct current,
such as a storage battery, not shown, the ter 25 change in position of any of the associated indi
cating relays to provide connection from terminal
minals of lwhich are designated B and C in the
drawing.
.Referring to the drawing, there is shown in the
upper portion of Fig. 1 a diagram of a stretch of
B of a source of current to the indication chan
nels to effect delivery of indication codes over the
'line wires during the time that a delivery relay
single track railway between two passing sidings 30 D at the >ofiice is energized to thereby position a
' together with'certain of the ñeldcircuits employed
inl connection with this invention, while the lower
portion of this figure shows a portion of a suitable
machinelocated at the control oflice and incor
porating this invention; '_
In the drawing diagrammatic connections are
shown between relays at the field stations and
indication relays in the oñice but it should be
understood that communication between the ñeld
stations and the oiiice is established by a code sys
tem which may be of thetype shown in Letters
Patent of the United States No. 2,229,249, issued
January 21, 1941, to L. V. Lewis, or in application
for Letters Patent of theUnited States, Serial
No. 496,907, ñled July 31, 1943, by A. P. Jackel,
and described in Manual 506A of The Union
Switch and Signal Company, Swissvale, Pa.
Consideration of >_the detailed mode of opera
tion of the code communication Asystem is not
group of indication relays in acco-rdance with the
conditioncf energization of the indication chan
nels.
The indication relays at the ofñce governed
35 from the field station at the left-hand or west
end of the single track stretch include a relay ITK
which ,controls a lamp in the track diagram of the
control machine tc indicate the condition of sec
tion IT- containing the track switch IW, the relay
ITK being controlled by the track relay I'I‘R for
the track section; a signal indication relay `ZRILIK
governed by relay ZRRGP which repeats the stop
indications of the signalsV ZRA and ZRB; and a
block indication relay ZRBK controlled by the
relay ZRBR which in turn is governed by traffic
conditions in the single track stretch. The con
trol of the relays ZRBR and llLBR. is shown dia-`
grammatically in the drawing, but these relays
may be governed through the wayside signal sys
needed for an understanding of our invention and 50 tem, as explained in the above-identified applica
tion of H. S. Young, so as to indicate that the
it is deemed suflicient to point out that a ñeld
block
is clear only when the wayside signal appa
station is provided at each end of each track
ratus conditions the stretch for traific in one
stretch to be controlled and that coding units
direction or the other.
are provided at the office and at each field station
"_The relays at the field station at the right
and are connected by a pair of line wires, not
hand end of the singletrack stretch function in
shown, over which control codes are transmitted
a similar manner to control indication relays STK,
at-.times from the ofiice to a selected field station,
4LBK_ and GLHK at the oiñce.
while at other times indication codes are trans
'Ir'he block indicationr lamp BKE in the-track
mitted over the same line wires from the different 60
diagram of the control machine is governed by
iield stations» to the ofûce without interference,
the relays ZRBK and fiLBK, one of which in
and that the transmission of each code includes
dicates the condition of a portion of the single
the temporary establishment of a plurality of
track block and the other that of the remainder.
communication channels, as for example, seven,
The signal levers ZSIG and 4SIG are the usual
between the oflice and a station to position a 65
levers forV the code control of the signal stick
group of relays.
.
relays, not shown, at the field stations at the
Each code includes a distinctive code call by
opposite ends of the single track stretch. The
means of which a'selector relay I-2S or 3-äS
signal
levers ZSIG and 4SIG are electrically in
at the oñice and a similar relay, not shown, at one
with respect to the control of train
- station onlyis energized to eifect temporary l) terlocked
movements into the intervening single track
establishment of seven communication channels
stretch by the master directional polarized‘relay
between the oflice and the station. The diiîerent
2-4LP, as in the above-identifiedapplication of
stations havediiîerent code calls, consequently
H, S. “Young and also in his Letters Patent of the
the selector _relays for different stations or panels
United States No. 2,326,991.
» ' Y
are'not energized at the same time, and the same
The> push buttons I'-2STB anda-:1STE are
2,411,387
5
the starting buttons for operating the usual code
starting relays l--2ST and S--IiST by means of
6
operated to condition the Wayside apparatus for
Westbound traffic.
At this time the relay Z-llBKSR is released,
which control codes are .initiated and the cor
while relay 2-4LPS is energized by current sup
responding stations selected. Each starting re
lay when energized initiates a control code as Ul plied over its stick circuit including its own con
tacts 23 and 2d, normal contact 25 of relay 2--descri‘loed in Patent No. 2,229,249 including a code
4LP, Winding of relay 2-5LPS from left to right,
call for energizing a selector relay S for the
and normal polar contact 26 of relay 2-4LP,
same panel. Each selector Vrelay when ener
and the contacts of relay ‘Z-LSLPS are picked up
gizedV releases the associated starting relay and
and do not establish circuits for the relays
connects terminal B of a local source of energy
ERBK, ¿iLBK and 2--4BKSR.
to selected ones of the control channels in ac
If it is desired to clear one of the signals 4L,
cordance With the positions. of the signal levers
the lever QSIG is moved to its left-hand position
and of the contacts of the master directional
and the starting button S--ASTB is pressed to
relay 2--4LP, and at the selected station relays
establish a pick-up circuit for the starting relay
are operated in accordance with the condition
S-QST and it picks up to establish a stick cir
of energizaticn of each of the control channels.
cuit for itself and to initiate operation »of the
The equipment is arranged so that when
cnice coding unit to transmit a control code to
energy is applied to channel 2 and a control code
the field station at the right~hand end of the
is transmitted to a field station, a traflic direc
tional ccntrol relay FS, not shown, is operated 20 stretch. At the time the starting button 3-4STB
is depressed, its contact 23 is closed but as relay
to condition the wayside apparatus to make the
E-êBKSR .is released its contact 29 interrupts
end of the stretch at which this relay is located
the circuit for supplying energy to relay l--ZST
an exit or leaving end. Similarly, the equip
and it remains released and does not cause a
ment is arranged so that, when energy is not
control code to> be sent to the field station at the
applied to channel 2 and a control code is trans
left-hand or West end of the stretch.
mitted to a iield station, the traffic direction
control relay FS, not shown, is operated to con
dition the Wayside apparatus to make the end
The control code transmitted as a result of
-picking upy of relay 3~-4ST causes a selector re
lay S-áS to pick up with the result that ter
of the stretch at which this relay is located an
entrance end so that the signal at this point may 30 minal B of the battery is connected over normal
polar contact 3E! of relay 2-4LP, front contact
be controlled by the Wayside circuits on opera
3l oi’ relay ‘i5-¿3S and left-hand contact 321 of the
tion of an associated code controlled signal re
lever IÃSIG to channel 5 and a control code is
lay, not shown.
transmitted to operate a signal control relay, not
The equipment is also arranged so that, when
shown, and places one of the signals 4L under
energy is supplied to the code channel governing
the control of the Wayside circuits, the one of
a signal control relay as, for example,l channel
the signals being determined by theposition of
5 or l, and a control code is transmitted to a held
switch 3W in the Well-known manner.
station, the signal control relay at that station
When selector relay ë-QS picks up, its fro-nt
is operated to render the signal subject to the
control of the wayside circuits. When energy is 40 contact 2l is closed but as contact 35i of relay
2-¿lLP is in its normal position, the battery is
not supplied to the code channel governing a
not connected to channel 2 and the control code
signal control relay, and a control code is trans
sent to the field station at the right-hand end
mitted to a ñeld station, the signal control relay
of the stretch causes the trai’lic direction relay
at that station is operated to keep the signal at
at that location to maintain that end of the
stop irrespective of the Wayside circuits.
stretch as an entrance end.
The equipment at the. left-hand or West end
When one of the signals él. displays a permissive
of the stretch includes a relay controlled over
indication, relay.1 dLRGP releases so that energy
channel ll and operating as explained in the
is supplied to channel it and when this ñeld sta
above-identiiìed application of H. S. Young to
tion sends an indicationV code to the oñice the
at times condition this end of the stretch to be .
relay ¿iLHK is picked up and is held by its stick
an exit end and to prevent transmission of a
circuit, while on picking up of relay ALHK its
block clear indication code by the» field station
contact 33 interrupts the circuits for energizing
at this location,
relay 2-~--llLP and thus prevents movement of the
The equipment is shown in the condition which
contacts of this relay to change the designated
it assumes when the track stretch is vacant, the
trahie direction While one of the signals 4L au
signals 2R and 5L are at stop», and the Voffice
thoriaes entrance of trañic into the stretch.
equipment conditions the stretch for Westbound
Ii' a train accepts the signal and entersthe
trahie. As the stretch is vacant, the block indi
stretch, the Wayside equipment operates in the
cation relays QRBK and ¿LBK and the detector
section indication relays ITK and STK are re 60 usual manner so that the signal is put to stop
and an indication is sent to the o?hce to release
leased and the panel lamps BKE, ITKE and
relay @LI-IK, While the track and block relays
ETKE are extinguished. As the signals 2R and
control the indication codes sent to the oi’ñce
«iL are at stop, the relays ERHK and @LI-IK are
to pick up the block and detector section relays
released, While the Westbound direction indica
to light the lamps BTKE, BKE and iTKE in the
tor lamp WFE is lighted by energy supplied over
track model, and to interrupt the circuits of the
normal polar contact 2S of relay .2i-_4LP and
relay E-IILP to prevent a change in the desig
back contact 2i of relay Z-ßBKSR. As the block
nated traiiîc direction during occupancy of the
detector section and signal indication relays are
stretch. When the stretch is vacated and the sig«
all released, energy may be supplied over the cir
nals are at stop, the indication relays are re
cuit controlled by` these relays toV the relay 2-leased and extinguish the lamps STKE, BKE and
flLP, but as the signal levers 2 and 4 are both in
iTKE and establish the vcircuits of the relay
their center positions the circuits for supplying
2--4LP.
energy to the relay 2-4LP are interrupted.
When the stretch is vacant and the signals are
It is assumed that the traffic direction relays,
notA shown, at the field stations were previously
at stop, the operator may change the designated
2,411,387
7
8
trafûc directionby moving the levers ZSIG and
ASIG to supply energy to relay 2-4LP. To
«change the designated traino direction from west
bound to eastbound, the lever 4SIG must be in
ends of the stretch are certain to be energized
and control codes are certain to be transmitted
to both ends of the stretch and the wayside equip
ment is certain to be conditioned for the new di
rection of traiîic.
When relays ZRBK and 4LBK pick up, .their
contacts 36 land 35 interrupt the circuits for op
erating relay Z-rlLP, but at this -time front con
tact 39 of relay 2-4BKSR is closed and shunts
the contacts 36 and 35 of relays 2RBK and 4LBK
to thereby enable the relay 2-4LP to be operated
to restore the original tranic direction if this is
either its center or its right-hand position and
the lever 2SIG is moved to its right-hand posi~
tion. If at this time‘the switch lock lever ZWL
is in its center position, as shown, energy is sup
plied over back contact 33 of relay dLHK, back
contact 34 of relay Í¿Rl-IK, back contact 35 of
relay 4LBK, back contact 36 of relay ZRBK, back
contact 31 of relay STK, back contact 38 of relay
l'I‘Kycontacts 46 and 4| of lever ZWL, contact
I42 of lever 2SIG in its right-hand position, and
contact 43 of lever 4SIG in its right-hand or its
center position to the upper winding of relay
2-4LP. The energy supplied to this winding
moves the relay contacts from their normal to
desired.
When the starting relays l-ZST and 3-4ST
are picked up, the oii‘ice coding unit is caused to
transmit control codes to the neld stations at the
opposite ends of the stretch, While as soon as the
oiiice coding unit starts to transmit a control code,
energy is supplied to terminal 51, as explained in
their reverse position so that contact 26 inter
rupts the circuit of lamp WFE and establishes
the circuit to permit energy to be supplied to
lamp EFE.
_A
the above-identiñed application ol‘ A. P. Jackel,
With the result that energy is supplied from this
terminal over ¿front contact 52 of relay 3-4ST,
front contact 53 of relay I-ZST, front contact
'
On movement of the contacts 25 and 26 of
relay Z-fiLP to their reverse position, there is
:a reversal in the direction oi flow of energy 25 54 of relay 2-4BKSR, front contact 55 of relay
'through the winding of relay 2-4LPS and the
contacts of this relay release with the result that
contact 23 interrupts the relay stick circuit and
the relay contacts remain released. On release
of relay 2_êLPS itscontacts 45 and 46 estab 30
ZRBK, front contact 56 of relay 4LBK, contacts
58 and 24 of relay 2-4LPS, reverse polar contact
25 of relay 2-4LP, winding of relay 2-4LPS, and
reverse polar contact 26 of relay 2-4LP to ter
minal C. The energy supplied over this circuit
of lever- 2WL which is closed only in the center
to relay 2-4LP‘S picks up the relay contacts with
the result that contacts 23 and 24 establish for
the relay a stick circuit governed by contacts 25
and 26 of relay 2-4LP so that energy of the same
polarity is supplied to relay 2--4LPS over its
position of this lever.
stick circuit as Was supplied to the relay over
lish circuits for the relays ÈRBK and @LBK and
their contacts pick up While contact 47 Vof relay
2-4LPS establishes the pick-up circuit for re
lay 2-4BKSR, this circuit including contact «i8
When relay Z-ISBK‘SR
picks up, its contact 49 establishes a stick circuit
its pick-up circuit. In addition> on picking up
to keep the relay energized until relays ERBK
of the contacts of relay 2-4LPS contact v2l! is
disengaged from contact 58 so that the .pick-up
and âLBK both release, or one of the relays ITK
_or BTK pick up. In addition, when relay
2-4BKSR picks up, its contact 2i interrupts the
circuits controlled by contact 2li of relay 2-4LP
for` lighting the lamps WFE and EFE, thus pre
venting lighting of either of these lamps until
establishment of the new direction of traflic is
completed. When either of the relays ZRBK
and 4LBK is picked up, energy is supplied to the
lamp BKE and it is lighted. Lighting of lamp
BKE at a time when lampsY WFE and EFE are
both dark provides a distinctive indication of the
fact that a change in the designated traffic di
rection is in process.
circuit for relay 2-4LPS is interrupted.
When relay 2-4LPS picks up. its contacts 45
and 46 interrupt the circuits which they control
for energizing the relays ZRBK and 4LBK, but
these relays are maintained energized by current
supplied over their stick circuits until indication
codes are received from `the field stations, so the
lamp BKE remains lighted. In addition, when
relay Z-llLPS picks up, its contact 4l interrupts
the pick-up circuit for relay 2-4BKSR, but this
relay is maintained ‘picked up by energy supplied
over its stick circuit which includes back contact
92 of relay I’IÍK, back contact S3 of relay STK, its
In addi-tion, on picking up of relay 2-4BKS`R
own front contact 49, and front contacts 60 and
its contact 29 establishes the circuit controlled
6I of relays ZRBK and 4LBK, and contact 2| of
by starting button 3~-4STB for energizing re 55 relay 2-4BKSR continues -to interrupt the cir
lay l'-2ST and contact 50 of relay 2-~4BKSR
cuits o-f lamps WFE and EFE, While contacts 29
establishes a circuit controlled by starting but
and 5U maintain the circuits for the starting re
tonVl-ESTB for energizing relay 3-4ST. Ac
lays so that depression of either starting lbutton
cordingly, after picking up of relay 2--4BKSR
energizes both starting relays.
energy is supplied to the starting relays for the
When the office coding unit operates to trans
control panels for both ends of the stretch when
mit a control code to the ñeld station at the left
the starting button for the panel for either end
hand end of the stretch, front contact 64 of relay
of the stretch is depressed. As pointed out above,
|-~2S is closed, but as contact 30 of relay 2-4LP
on movement of the contacts of relay 2-4LP
there is a reversal in the polarity of the energy
supplied to relay 2-4LPS and its contacts re»
lease promptly While the relay 2-4BKSR picks
up immediately upon release of relay Z-LELPS,
with the result that the contacts of relay
2~-4BKSR are picked up and establish the cir
cuits for the starting relays before the operator
can move his hand from a signal lever toa start
is now in its reverse position, energy is not sup
plied to channel 2 and the control code sent to
.the ñeld station at the West end of the stretch
causes the trañic direction relay at that location
to change that end of the stretch from an exit to
an entrance end.
A
»
At .this time energy is supplied over reverse
polar contact 30 of relay 2--4LP, front contact
65 of relay I-ZS, and right-hand contact 65 of
ing button. Consequently, when a starting but
ton is depressed following a change in the desig
lever 2SIG to channel 'l so the control code trans
nated traihc direction, the starting relays for both
of the stretch operates the signal control relay
mitted to the ñeld station at the left-hand end
' antena
@i
l0
usual manner to control -the circuits of the lamps
at that location to permit' clearing of signal 2RA
in‘the "track model` on tha-panel `of the control
machine, While contacts vof these relays interrupt
the circuits of the relay Z-liLP to insure that the
contacts o_f this relay remain in their right-hand
position and maintain eastbound trafûc.
Because of code congestionon the C. T. C. sys
tem code’line, indication codes from the field sta
tions to the ofüce may be delayed and the east
bound train maylenter the stretch before indica
or ZRB.
When the oíûce coding unit operates to trans
mit a control code to the ñeld station at the right
hand end of the stretch, the relay 3-4S is picked
up and energy is supplied over reverse polar con
tact 30 of relay Z-ALP, and front contact 2l of
relay 3~--äS ta channel 2 so that the traflic di
rection relay at the east end oi the stretch is
operated to change that end of -the stretch from
tion codes have .been sent to the oiiice t0 release
Ian entrance to an exit end. At this time, front
relays _ZRBK and IILBK, and under these condi
contact 3l of relay 3-4S is closed but as contact
30 of relay 2-4LP is in its reverse position, energy
cannot be supplied to channel 5 and .the control
code sent at this time causes the signal control 15
maintain `the stick circuit for relay 2-4BKSR. If
relay at this ñeld station to maintain the signals
¿LA and ALB at stop-
relay Z-llBKSR remains picked up, its contact
39 maintains the connection shunting contacts
tions indication codes subsequently sent to the
oil‘ice cause relay ZRBK to remain picked up to
35 and 36 of relays 4LBK `and ZRBK in the cir
As a result of transmission of control codes, .the
cuits of relay 2-4LP, thereby permitting lthe op
starting relays l-ZST and 3--4ST are released
in the usual manner, and ltheir contacts 53 and zo erator to disestablish the designated traflic di
52 interrupt the pick-up circuit for relay 2--4LPS~
rection with resultant interference with progress
'I‘he control codes. sent to the field stations
o_f the train present in the stretch. This system
is arranged so that contacts of relays I TK and
cause the Wayside equipment to prepare the
stretch for eastbound traino While one of the sig
3'IÍK are included in the stick circuit of relay
nals 2R clears and causes relay ‘.lRRGP to re
25 yZ-,IlBlfïSlt and on entrance of an eastbound
lease. When the Wayside equipment operates to
establish eastbound trañic indication codes `are
sent to the oñ‘ice .to release relays ZRBK and
ÃLBK, While release of relay ZRRGP causes an
indication code to be sent to the oñice to pick
up relay ZRHK.
On release of relays ZRBK and ALI-,IK their
contacts 60 and VIiI interrupt the stick circuit for
relay Z-ABKSR and it releases to additionally
train into the stretch, an indication code is cer
tain to be transmitted to the oiîice to pick up
relay ITK with the result that its contact 92
interrupts the stick circuit -for relay E-ÀBKSR
30 and causes Ñit to release if it is not already re
leased.> Accordingly, if a train enters the stretch
before the block clear indication codes are trans
mitted to the oñice to release relay Z-QBKSYR
this relay will be released when an indication code
interrupt its own stick circuit .and its contacts er» is ‘sent to the office reporting occupancy of a de
tector section, and as relay 2-4BKSR is certain
29 and 5_9 interrupt the circuits governed by the
to be released after entrance of a train into the
>starting buttons for the starting relays at oppo
stretch, its Vcontact 39 is certain to interrupt the
site ends of the stretch, while contact 2| of re
connection shunting contacts 35 and 36 of relays
lay Z-dBKSR establishes the circuit including
reverse polar contact 20 of relay 2-4LP to light 40 ALBK vand ERBK in the circuits of relay 2-4LP
and thereby prevent the operator from disturb
the lamp EFE to indicate that eastbound trañic
ing the designated trañ‘ic direction l.during occu
has been established. On release of relays ZRBK
and 4LBK the circuits of lamp BKE are inter
pancy of the stretch.l
‘
i
Furthermore, as relay Z-ABKSR is certain to
rupted and this `lamp is extinguished.
When relay Z-ABKSR reelases, its contact 39 >4.5 be released during occupancy of the stretch,` its
contact ZI ,is certain to establish the circuit of
in the circuits of relay 2-4LP is openedand con
lamps WFE and EFE so that the appropriate one
trol `of `the relay 2-4LP is restored to the relays
,ofv these lamps `is lighted.
‘
ZRBK and llLBK. At this time, relay .ZRT-IK is
If, While the eastbound train under considera
picked up and its contact 34 interrupts the cir
cuits of relay 2-4LP to thereby prevent opera 50 tion is present in the stretch, the operator Wishes
to clear one of the signals >21€?. to permit a second
tion of this relay to change the designated traiiic
or following train to enter the stretch, he may
direction. 4In addition, on release of relays
do so .byimoving lever ZSIG to its right-hand po
,l 2-4BKSR, ZRBK and ALBK their contacts .54,
55 and 56 interrupt the pick-up circuit of relay
sition'and pressing the >starting button II-ZSTB
55 to pick up relay I-ZST to send a‘control code to
If an eastbound train now accepts the signal
,2R and enters the single track stretch, the signal
42R, is put to stop and the track relays of the cc
_the ñeld‘ station at the left-hand end of the
stretch. At this time, the battery is connected
to control channel ‘I over lreverse polar contact
3,0 ‘of _relay `2--4LP, vfront contact 65 of relay I-2S
sent to the oilice to release relay ZRHK and to r60 land right-hand contact 66 of lever 2SIG so the
control ,code transmitted Äat this time operates
pick up relay ITK so that contact 38v of relay
the signal control relay to clear one of the sig
ITK interrupts the circuits of relay 2-4LP `to
nalsZR if traîûc conditions are proper.
prevent a change in the designated trañic direc,
4at ,this time relay 2‘-4iBKSR is released and
tion during occupancy of the stretch. As the
train advances through the stretch, control codes 65 Lits contact 50 interrupts the circuit controlled
by starting button I-ZS‘TB so that energy is not
are sent to the office to pick up relay ERBK so
cupied sections are released and control codes are
that its contact 36 interrupts the circuits of relay
.2-4LP to prevent a change in the designated
suppliedto relay _ji-4ST when the starting »but
ton jI-¿ZSTB is depressed. Accordingly', a con.
-trol code is not »transmitted to the field station
trañic direction, While a contact of relay ZRBK
establishes a circuit for the lamp BKE. Light 70 `at the right-hand of the stretch. Since the
stretch -is `already prepared for eastbound traino,
transmission of a control code to the `east end
of the stretch is unnecessary,` and as this system
veliminates this control code When it is not re
of the _train through the stretch, the block and
detector section indication relays operate in the 75 -quired, this system reduces the total number »of
ing of this lamp accompanied by lighting of lamp
EFE provides a distinctive indication of occu
pancy of the stretch. On continued movement
,
.
11
control codes transmitted and thereby reduces
12
the stretch, the wayside equipment operates to
code congestion on the C. T. C. system code line
prepare the stretch for traffic in the direction de
wires.
termined by the positionlof` the contacts of relay
If, while the stretch is prepared for eastbound
trafûc, the operator wishes to prepare it for west
bound trame, he may do so provided the-stretch
is vacant and the signals 2R, are at stop so that
the circuits of relay 2-4LP are complete. If le
2--4LP, and here assumed to be eastbound.
If the operator now decides to restore the origi-A
nal direction of traffic, that is, westbound, and
moves lever 2SIG to its center or its left-hand
position, and moves lever 4SIG to its left-hand po
ver 4SIG is now moved to its left-hand position
sition, energy will be supplied to relay 2-4LP
and lever ZSIG is in either its center or its left 10 to move its contacts to their left-hand position,
hand position, energy is supplied over the circuit
and on this movement of the relay contacts, the
including back contacts of the various indication
polarity oi the energy supplied to the relay
relays, contacts 40 and 4l of lever ZWL, contact
2-4LPS is changed and the relay contacts re
68 of lever 4SIG, and Contact 69 of lever ZSIG to
lease to interrupt the relay stick circuit and es
the lower winding of relay 2-4LP to move the 15 tablish the pick-up circuits for relays 2-4BKSR,
contacts of relay Z-GLP to their left-hand or
ZRBK and ALBK to pick up these relays if -they
normal positions. On this movement of the con
have released or to maintain them picked up if
tacts of relay 2-4LP, the contacts25 and 2E
they have not become released.
change the polarity of the energy supplied to re
If movement of the contacts of relay 2-4LP
lay 2-4LPS over its stick circuit and the con 20 to their left-hand position occurs prior to trans
tacts of relay 2-liLPS release with the result that
mission of a control code to either end of the
contacts 23 and 24 of relay 2-4LPS interrupt
stretch, that is, while relays l-ZST and 3-4ST
the relay stick circuit and the relay contacts re
are both picked up, energy will be supplied to
main released until the starting relays l-2ST
relay 2-4LPS over its pick-up circuit as soon as
and 3-4ST are picked up to initiate transmission 25 energy is supplied to terminal 5'! of the oñice cod
of control codes to both ends of the stretch as
ing’unit and the contacts of relay 2-4LPS will
explained above. Also on release of relay
pick up to interrupt the relay pick-up circuit,
2-4LPS pick-up circuits are established for re
lays ZRBK, ALBK and 2-4BKSR and these re
establish the relay stick circuit, and interruptA the
circuits which it controls for relays 2-4BKSR„
lays pick up to light lamp BKE, prevent supply of 30 ZRBK and 4LBK.
energy to lamp WFEÍ or
and establish the
If movement of the contacts of relay 2-4LP
to their left-hand position occurs prior to trans
mission of the control codes to either end of the
is depressed.
'
stretch, the control codes which are transmitted
As the contacts of relay 2--4LP are in their 35 will cause the neld station equipment to prepare
left-hand or normal position, energy is supplied
the stretch for traine in the direction designated
over normal contact 30 of relay 2-4LP and front
by the relay 2-4LP, that is, westbound traflic,
contact E4- of relay l-ZS to channel 2 and the
and, as relay 2-4LPS is picked up, the indication
control code sent to the left-hand end of the
codes sent to the oiñce following the control codes
stretch conditions that end of the stretch to be 40 will release relays ZRBK, ALBK and 2-4BKSR
an exit end. As contact 3!) of relay 2--4LP is in
to show that traffic has been established in the
its left-hand position, energy is not supplied to
desired direction.
channel 2 on picking up of contact 21 of relay
If movement of the contacts of relay 2-4LP to
3,-4S and the control code sent to the right-hand
their normal position does not occur until after
end of the single track stretch conditions that 45 a control code has been sent to either one or both
end of the stretch to be the entrance end.
ends of the stretch, one or both of the starting
When transmission of control codes to both
relays will be released and the pick-up circuit for
ends of the stretch is initiated, energy is supplied
relay 2--~4LPS will not be established and the con
to relay 2-4LPS over its pick-up circuit and its
tacts of relay 2-4LPS remain released after re
contacts pick up to interrupt the relay pick-up 50 lease of the relay following the change in the po
circuit, establish the relay stick circuit, and in
larity of the energy supplied to the relay as a
terrupt the pick-up circuits of relays 2-4BKSR,
result of movement of the contacts of relay
circuits for the starting relays so that both of
these relays pick up when either starting button
ZRBK and 4LBK, while the equipment otherwise
2-4LP.
operates as explained above during establishment
As it is assumed that one or both of the con
of eastbound trafñc.
55 trol codes was transmitted prior to movement of
This system is arranged to insure that even
the contacts of relay 2_-4LP to their left-hand
though the contacts of relay 2-4LP are moved
or normal position, the equipment at one or both
more than once before the direction of trafûc
of the field stations will condition the wayside
ls finally determined, the direction of trafûc in
equipment for eastbound traiììc, while indica
dicated in the oñice is the same as that which is 60 tion codes may thereafter be sent to the oiñce to
established by the Wayside apparatus in the ñeld.
release relay ZRBK and/or íihBK, before control
As pointed out above, when -the contacts of
codes are transmitted to establish traffic in the
relay 2-4LP are moved from one position to the
direction now designated by relay ‘E4-4LP, that
other to change the designated traiiic direction
is, westbound'trañic. This is particularly true if
as, for example, from westbound to eastbound, 65 after returning the contacts of relay 2--4LP to
the polarity of the energy supplied to the relay
their left-hand positions, the operator delays
2-4LPS is changed and its contacts release to
pressing of a starting button and‘thus delays
pick up relays 2--4BKSR, ZRB-K and 4LBK. If
transmission of control codes for the new direc
a starting button is now depressed, the relays
tion of traiiic.
v
I-ZST and 3-4ST pick up to cause energy >to 70
However, as just explained, relay Z-L‘ILPS is
be supplied to relay 2-4LPS over its pick-up cir
released so that if an indication code is sent to
cuit and its contacts pick up to interrupt the
release relay ZRBK or @LBK the relay will re
relay pick-up circuit and establish the relay stick
lease momentarily during the picked-up period
circuit, while as soon as control codes can be
of the associated delivery relay D, but Will there
transmitted to the ñeld stations at the ends of 75 after be picked up again by energy -supplied over
"2,411,387
‘13
the circuit established by a back contact of relay
z_tL-PS. Accordingly, relays ERBK and ALBK
remain picked up and maintain the circuits oi
lamp BKH «and the stick circuits for relay
E-’QBKSI-t, with the result that relay ‘âfîiBKSR
is maintained energized by current supplied
over bot-h its pick-'up and stick circuits. As
relay `2--í5l3iäSR is picked up its contacts »29 .
and "5b maintain the circuits for the starting re
lays and ii‘ either starting :button is depressed,
both starting relays will be picked up so that
control codes will be sent to both ends of the
stretch to condition the stretch for traiiic in the
14
on hand-throw switches at intermediate points
in a track stretch. As shown in the track diagram
at the top of Fig. 1 there is a switch 2W in the
single 'track stretch between switches I'W and
3W.
rI‘his switch is equipped with an electric
.lock which is controlled by the wayside signal
circuits in the manner explained in detail in the
above-identiiied application of H. S. Young.
Knowledge of the detailed mode of operation of
the wayside signal circuits to control the electric
lock for switch 2W is not essential to the underm
standing of this invention and it is deemed suffi
cient to point out that this lock may be energized
to permit a train on the siding to enter the main
direction designated by the relay 2-4LP, that is,
track when and only when energy is'supplied from
westbound trafûc.
It will be seen `that relay E-dLPS releases
opposite ends of the stretch to line or other con
trol relays associated with the switch 2W. In
Whenever the contacts of relay 2-4LP are moved,
order to eiîect this simultaneoussupplyoi energy
and that relay É--íiLPS when released, remains
released until control codes are s_ent to both ends
from both ends of the stretch it is necessary‘to
of the stretch, while the relay î-liLPS when re
condition both ends of the stretch to be exit ends
leased prevents release of the block indication
and f or the stretch to be unoccupied.
relays ZRBK and ¿11113K and of the relay
In order to cause the C. T. C. equipment .to
2--‘âBKSR. This arrangement, therefore, pre
transmit control codes which‘will condition >both
vents registration of block indication codes un
ends of the stretch to be exit> ends it is necessary
less at the time these codes are received the con
to supply energy to channel 2, or to another chan
tacts of relay ÍZ-JZLP are still in the position
nel, such as channel 4, during transmission of
which :they occupied at the time that the control
control Ácodes to the iield stations at the ends of
codes ,producing the indication codes were trans
the stretch.
mitted. This mode of operation Vprevents indi
As shown in Fig. 1, the contacts of 0the `relay
cation codes showing that the wayside appara 30 2-4LP are in their left-hand positions to desig
tus <is prepared for one direction of trafñc being
nate west-bound traffic Vfor the stretch, the signal
recorded -at a time when the office equipment
levers ZSIG and ¿SIG are both in their center
designates the opposite direction of tra-nic and
positions, the sign-als 2R and 4L are at stop so
thereby eliminates any possibility that the direc
that relays ZRI-IK and áLHK are released, and
tion’of traffic reported in the office and that ac' .
switch lock lever 4ÍWL is in Yits «center position.
tually established in the field will be out of cor
The lever 2WL is preferably of the push-turn `type
responderme.
shown in Letters Patent of the United States No.
Thismode of Voperation also causes the relay
2,289,736 `to C. S. Snavely and R. I-I. Zet/Wo.
E-HBKSR to maintain the circuits for the start
To enable `a train to enter the main line via
ing relays to thereby insure that, until trahie is
switch 2W the central oñîce operator in response
established in `the `designated direction, control
to a'telephone call from the train -crew will move
codes will be -transmitted to both ends of the
the lever ZV/L >to the left or `right according >to
stretch when the starting button for either end
the direction the train is to move after entering
of the stretch is pressed so that the wayside -ap
the single track stretch, and if the-entering signals
paratus will operate promptly and positively to -' 0 are at stop and the block is unoccupied so that the
establish :traiiic in the designated direction re
indication relays are released, movement of the
gardless of Aunusual or irregular manipulation oi
lever 2WL to either of its positions results inthe
the control machine. If the relay Z-ÄBKSR did
supply of energy to relay 2-4LP to move >its con
not operate in this manner to maintain the cir
tacts to a position corresponding to that oi lever
cuits for the starting relays, >under some condi- ‘
2WL if the lever 2WL and the contacts of relay
tions .pressing of a starting button would ener~
Z-?lLP `are out of correspondence.
gize only the associated starting relay and cause
If lever ZW'L is moved ‘to its `left-hand position,
a'control code to be sent only to one end of the
energy is supplied over back contacts of the
stretch with the result .that the wayside yequipvarious indication relays, contacts 40 and 4l of
ment may not prepare the entire stretch for traf- lever 2WL, and contact 69 or lever `ZSIC?, to the
fic in the desired direction. Although this con
lower winding of relay 2-4LP. The energy supdition, if lit arises, can readily be corrected by
plied to this winding maintains the relay con#
pressing the starting- button ifor >the station at
tacts in their left-hand position, as shown.
the other end of the stretch to cause a control
If lever ZWL is moved to its right-hand posi
code to be transmitted to’that station to thereby 60
tion, energy is supplied over back contacts oi the
cause the wayside equipment to complete prepa
ration of the stretch for traii‘lc in the desired di
rection, the operator may not be aware of the
cause of the difñculty or be ’familiar with the
means for overcoming it, and some delay may be
experienced in‘establishing traiïlc in the desired
direction. Since this system operates to cause
relay :2-¿1BKSR ‘to maintain the circuits for the
starting relays until establishment of traftlc in
the designated traffic direction is complete, it i
makes operation of the equipment prompt and
positive and eliminates delays which might
otherwise occur.
various'indication relays, contact 40 of lever ZWL,
and contact 43 of lever QSIG to the upper winding
of relay 2-4LP to rnove the relay contacts to
their right-hand position.
vDuring turning movement of the lever ZWL,
contacts 86 and il!) are closed, and when contact
8T of lever 2WL and contact 88 of relay 2--4LP
are in correspondence, either as a result of move
ment of the lever into correspondence with the
relay contacts ormovement of the relay contacts
into correspondence with the lever, energy is sup
plied to relays ZRBK and ¿LBK and their con
tacts .pick up to establish stick circuits for the
This `system is also arranged to contro-1 the
wayside'equipment `.togovern electric switch locks 75 relays anditocause contacts B6v andßß .to interrupt
15
2,411,387
the circuits of relay 2-4LP and thus prevent a
change in the designated trañîc direction.
If the contacts of relay 2-4LP are moved as a
16
,
nel 2 over the circuit including back contact 14
of relay ALHK, back contact 75 of relay ZRHK,
contact i6 of lever BWL, contact 'Il of lever ZSIG,
contact 'i8 of lever ASIG, and front contact 82
of relay 3-4S and this end of the stretch is con
result of movement of the lever ZWL, the polarity
of the energy supplied to the relay 2-4LPS is
changed and the relay contacts release. On re
ditioned to be an exit end. As both ends of the
lease of the relay Z-ASLPS at this time, its con
stretch are conditioned to be exit vends the way
tact 41 does not establish the pick-up circuit for
side equipment operates to permit the switch 2W
relay 2-4BKSR since this circuit is interrupted
to be moved to enable the train on the siding to
by contact 48 of lever ZWL, Accordingly, relay 10 enter the main track.
2-4BKSR remains released and its contactlllS
If at the time the control codes are transmitted
does not Vestablish the relay stick circuit, while
the lever 2WL and the contacts of relay 2-4LP
its contact 39 does not establish the connection
shunting contacts 35 and 36 of relays lâLBK and
are both in their right-hand positions, energy is
not supplied to channel 2 during transmission of
ZRBK in the circuits of the relay 2-4LP. On re 15 a control code to the ñeld station at- the left~hand
lease of relay Z-llLPS its contacts 45 and 46
end of the stretch as normal polar contact 30
establish pick-up circuits for relays 4LBK and
of relay 2-4LP is open. However, during trans
_ZRBK to pick up these relays if they are not
mission of a control code to this ñeld station,
picked up by energy supplied over other circuits
energy is supplied to channel 4 over the circuit
and contacts 35 and 35 of relays 4LBK and ZRBK 20 including back contact 14 of relay 4LHK, back
interrupt the circuits of relay 2-4LP to prevent
contact 'l5 of relay ZRHK, contact 16 of lever
movement of the relay contacts to change the
ZWL, contact TI of lever ZSIG, Contact 'I8 of lever
designated trafûc direction.
ftsïG, and front contact 80 of relay l--ZS so that
Momentary closing of front contacts 1€) and TI
the relay at the ñeld station at the left-hand end
of lever ZWL during turning of lever ZWL estab 25 of the stretch and governed over channel 4 con
lishes pick-up circuits for the relays I-ZST and
ditions that end of the stretch to be an exit end
3-4ST and initiates transmission of control codes
and also operates to prevent transmission of a
to the ñeld stations at both ends of the stretch.
block clear indication code from that ñeld station.
On picking up of the starting relays 3--4ST and
When control codes are transmitted to the ñeld
l-2ST their contacts 52 and 53 permit energy to 30 station at the right-hand end of the stretch and
lbe supplied over the pick-up circuit for relay
the contacts of relay 2-4LP are in their right
2_4 LPS as soon as relays ZRBK and llLBK pick
hand positions, energy is supplied to channel 2
up to close their front contacts 55 and 56 and the
over reverse polar contact 3B of relay 2-4LP and
olîice coding unit operates to supply energy to ter~
front contact 21 of relay 3-4S and the equip
minal 5l'. At this time, as explained above, relay 35 ment at this field station conditions this end of
Z-IIBKSR'remains released so its contact 54 in
the stretch to be an exit end. As both ends of
the pick-up circuit for relay 2-4LPS is open, but
the stretch are conditioned to be exit ends the
this Contact is shunted by contact 85 of lever 2WL
Wayside equipment operates to permit the switch
so energy is supplied to relay 2-4LPS, if the
2W to be moved to enable the train on the siding
relay contacts released, and the contacts of relay 40 to enter the main track.
2-4LPS pick up to establish the stick circuit for
After transmission of control codes to the two
relay 2-4LPS and contacts 46 and 45 of relay
ends of the stretch an indication code may be
2~4LPS interrupt the pick-up circuits for re
sent from the ñeld station at the right-hand end
lays ZRBK and 4LBK.
,
of the stretch to release relay 4LBK so» that its
If at the time the control codes are transmitted 45 back contact 35 is closed. However, as previously
the lever 2WL and the contacts of relay 2--4LF
explained, the relay at the ñeld station at the left
are both in their left-hand positions, energy is
hand end of the stretch and controlled over chan
supplied to channel 2 over normal polar contact
nel 4 prevents the transmission of a block clear
3l! of relay 2--4LP and contact 64 of relay l-ZS
indication code from that station and relay ZRBK
during transmission of a control code to the west 50 is certain to remain picked up so that its contact
end of the stretch so that the west end of the
36 interrupts the >circuits for relay 2-4LP to
stretch is made an exit end. In addition, dur
thereby prevent a change in the position of the
ing transmission of a control code to the west
contacts of relay 2-4LP. If a change in the po
end of the stretch, energy is supplied to channel
sition of the contacts of relay 2-4LP could occur
4 over the circuit including back contact ’i4 of 55 following unlocking of the switch 2W and move
relay 4LHK, back contact l5 of relay ZRHK, con-_
ment of a train over this switch into the main
.tact 'I6 of lever ZWL, contact 'l1 of lever ZSIG,
track stretch, it might result in putting to stop in
contact 'I8 of lever 4SIG, and front contact 80
front of the train a signal at an intermediate
of relay l-2S so that, as explained in the abovepoint in the single track stretch with resultant
identified application of H. S. Young, a relay at 60 delay to this train and in clearing of the track
the left-hand end of the stretch conditions that
stretch for other trañìc.
end of the stretch to be an exit end if it is not
This system is arranged to eliminate this possi
so conditioned by the relay governed over chan~
bility by preventing movement of the contacts of
nel 2, while the relay governed over channel 4 pre
relay 2-4LP as the relays ZRBK and 4LBK are
vents transmission of a block clear indication code 65 picked up as a result of movement of lever 2WL,
’ from the west end of the stretch and the next
indication code sent from this field station main
tains relay ZRBK picked up so that its contact 36
interrupts the circuits of relay 2-4LP and thus
prevents movement of the contacts of this relay to 70
change the designated traflìc direction.
When control codes are transmitted to the
right-hand end of the stretch and the lever 2WL
and the contacts of relay 2-4LP are both in their
left-hand positions, energy is supplied to chan
and the relay ZRBK is thereafter maintained
picked up because a block clear indication code
cannot be transmitted from the west end of the
stretch, while on movement of lever 2WL away
from its center position, the relay 2-4BKSR, is
maintained released so that its contact 39 does
not shunt the contacts of relays ZRBK and 4LBK
in the circuits of the relay 2-4LP.
After a train has entered the main track stretch
75 over the switch 2W and the switch has been re-'
2,411,887
1’7V
.
turned to its original position and locked, the op
18
for trafElc in the direction designated by relay 2_
4LP andthe blockindication relays ERBK and
erator may convert the end of the stretch behind
4LBK thereafter function in the normal man
the train to an entrance end so that the head
ner to prevent energization of relay 2-4LP while
block signal at this location may be cleared to
the stretch is occupied but to permit this relay to
permit a following train to enter the stretch.
be energized to change the designated traiiic di
If the contacts oi relay 2-4LP are in their left
reotion‘when thestretch is vacated.~
-`
hand position, as shown, indicating that the train
Where some `forms of wayside signal circuits
was to gov
after entering the main track, the
are employed, occupancy of an entire stretch is
lever 2WL will be in its left-hand position, and
indicated at timesïfrom one end of the stretch
on movement of the lever to its center position
and at other times from the other end of the
Contact 'IB of the lever 2WL interrupts the cir
stretch instead of a portion of the 'stretch being
cuits for supplying energy to channel 4 during
indicated from one end and the remainder being
transmission of a control code to the station at
indicated from the other end. Where >this ar
the left-hand end of the stretch, and for supply
ing energy to channel 2 during transmission of a 15 rangement is employed the block indication re-`
lay at :the cnice which is governed from the exit
control code to the station at the right-hand end
end of the stretch is continuously picked 'up re
of the stretch.
gardless of trafûc conditions in the stretch, while
On this movement of lever 2WL to its center
the block indication relay at the omce which is
position, the contacts of relay 2-4LP remain
in their left«hand position so there is no change 20 governed from the entrance end of the stretch is
released or is p-icked up according as the stretch
in the energy supplied to `relay 2--4LPS over its
is Vacant or is occupied. Accordingly, where oc->
stick circuit and the relay contacts remain picked
cupancy of the entire stretch is indicated from
up. Accordingly, when lever 2WL is moved to
one end or the other, one or the other of the
its center position and its'contaot 48 is closed,
energy is not supplied to relay 2-4BKSR as con 25 relays, 4LBK or `ZRBK is released when the>- i
stretch is vacant, but both of these relays are
tact 41 of relay 2----4LPS is picked up. ` Relay
not released at the same time.` In these situa
Z-QBKSR, therefore, remains released and its
tions the stick circuit for the relay Z-IlBKSR
contact 39 does not shunt the contacts of relays
should be modified as shown in Fig. 2" so that
ZRBK and ¿LBK in the circuits of relay 2-4LP,
and the circuits of relay 2-4LP continue to be 30 the contacts 6I and'ûll of these relays'are con
nected in series instead of in multiple as shown
controlled by relays ZRBK and 4LBK so that the
in'Fig. 1. In addition, in these situations, the
designated direction of traffic cannot be changed
at this time.
shown in Fig. 3 so that contacts 35 >andt‘iì of re
During movement of the lever 2WL from its
left-hand to its center position, contacts 'l0 and 35 lays 4LBK and ZRBK are connected in multiple
instead of in series as shown in Fig. 1.
1| momentarily establish circuits for the relays
rI’he operation of the equipment when modi
I-ZST and 3-4ST and they pick up to establish
fied as shown in Figs. 2 and 3 is substantially
stick circuits for themselves and initiate the
the same as the system shown in Fig. 1 and a
transmission of control codes to the iield stations.
In addition, during movement of lever ZWL to its 40 detailed `explanation of the operation »of the
equipment is not deemed necessary,
center position, contacts 86 and 90 establish cir
cuits to supply energy to relays ZRBK and 4LBK
Although we have herein illustrated and de
and they pick up if they are not already picked up.
scribed only one form of railway `traffic control
If lever llSIG is now moved to its left-hand po
ling apparatus embodying our invention, to'
sition, energy will be supplied to channel 5 over 45 gether with modifications thereof which we may
normal polar` contact 30 of relay 2-4LP, front
employ, it is understood that various changes'
contact 3| of relay S-LlS and contact 32 of lever
and modifications may be made therein Within
tSIG, during transmission of a control code to
the scope of the appended claims without de
the iield station at the right-hand end of the
parting from the spirit and scope of our in
stretch, while energy is not supplied to channel 50 vention.
2 during transmission of a control code to this
Having thus described o-ur invention, what we`
station so the right-hand end of the stretch is
claim is:
'
l
i
converted to an entrance end and the signal con
l."`In direction selecting means for a stretch o
trol relay is operated to permit clearing of a
railway track equipped with a signaling system
signal @L if conditions are proper.
55 governed jointly by code controlled traffic direc
As pointed out above, the circuit for supplying
tion relays at opposite ends ofY the stretch so
energy to channel 4 during transmission of a
that at times the stretch is conditioned for traf
control code to the station at the left-hand end
ric in one direction >andiat other times is condi
of the stretch is interrupted so the equipment at
tioned for trafûc in the other direction, in com
that iield station is converted to a normal exit 60 bination, `electroresponsive means ata control
office including contacts movable between a iirst
end and block indication codes may bev trans
and a second position for controlling .circuits gov-`
mitted to the oñice to show trañic conditions in
the stretch.
`
erning transmission of control codes to said traf
The equipment operates in a similar manner if
íic direction relays to cause them to establish
the train entering the main track over switch
traf?ic in one direction or the other according as
2W had proceeded to the east and the operator
said contacts occupy their iirst or- their second
position, block indication means at said control
had thereafter wished to clear one of the sig
ofñce for indicating whether said stretch is oc
nals 2R behind the train and a detailed ex
cupied or is unoccupied, circuit means for oper
planation of the operation of _the equipment at
70 ating said electro-responsive means to change
such times is not deemed necessary.
When the lever 2WL is restored to its normal
the position of said contacts provided said- block
indication means indicates 'the stretch to be un-î
position and control codes `are transmitted while
occupied, an auxiliary relay having' contacts
the signal levers are in their stop positions, an
movable between a first position in which they
end of the stretch is >converted» from an exit to
permit the block indication means to indicate
an entrance end to thereby prepare the stretch
254;
1,9.:
that Vthe stretch is unoccupied and a second po-l>
1 the designated traffic direction provided said block
sitionin which they prevent said block indication'`
means from indicating that the stretch is unoc
indication means indicates that the stretch is
unoccupied or the contacts of said Eblock indi
cation repeater relay are in their second posi
tion, means responsive to operation of said Aelec
cupied,_ means operative `o_n _ movement of,v the
contacts of said electroresponsive means. between
theirtwo positions to move the contacts of saidV
auxiliary relay tol their second position,- and
means eiïective when transmission ofV control
' troresponsive means to change the designated
traffic direction i'or moving the contacts of said
auxiliary 'relay to their second position, and
codes to the trafllc direction relays at both ends
means effective whenv transmission or' control
codes to the traino direction relays at both ends
ofthe stretch is initiated for moving». the rcon
tactsY of said auxiliary Yrelay tol their ñrst
position.
\
of thev stretch‘is initiated for moving the cont-acts
of'saidauxilíary relay to their ñrst position.
'
'2.fIn direction seiecting means for a stretch
fi. In direction selecting means for a stretch
of railway track equipped with a signaling sys
tem governedrjointly lby code controlled tra?lic
direction relays at oppositeV ’ends of the stretch
ofrailway track equipped with a signaling sys
tem governed jointly by code controlled traffic
direction relays at opposite ends `of the stretch
s_othat at times the stretch is conditioned for
so that at times the stretch is conditioned for
traiiic in one direction and at other times is con
traiiîc. inA one direction and at other times is con
ditioned for traino in the other direction, in com
ditioned for traffic in the other direction, in com.
bination, electroresponsive means at a control ¿0., bination,
a polarized relay at a control o?iice hav
oiiice- capable of designating traiiic in one direc ' " ing contacts
governing transmission of control
tion or the other and controlling circuits govern
codesto said trafñc direction relays to cause them
ing transmission oi control codes to said traiiic
to’vestablish traine in one direction or the other
direction relays to cause them toI establish traf
according as the contacts of said polarized relay
‘ fic in: the directionfdesignated by said electro
occupy (their. normal or their reve-rse position,
responsive means, block indication means at said
' block indication means at said control cnice for
control oiiice for indicating whether said stretch
indicating whether said stretch is occupied or is
unoccupied, circuit means for operating the con
is occupied or is unoccupied, circuit means for
operating said electroresponsive means to change-
the designatedftrafiic direction provided said
blocl; indication means'v indicates .the stretch to
beunoccupied, an auxiliaryrrelay having con
tacts movable between a Jiirst position in whichl
they permit the blockindicationmeans to» indicate that the stretch is unoccupied and a second
position in which they prevent said block indica
tion means from. indicating that the stretch is`
unoccupied, means responsive to operation of said
electroresponsive means to change the designated
tra?lic direction "for >moving >the ,contacts of said
auxiliary relay4> to,` `their second position, and
means Yeffective when >transmission of control
codes to the‘traihc'directionrelays v,at'both ends
o_fcthestretch is `initiated for moving _the con-:f
tacts of ’said auxiliary relay to- their first posi-A
tion.
,
i
Y
.
~
tactsoil said polarizedV relay between their two
>p_ositions provided said block indication means
indicates that the stretch is unoccupied, an aux
iliary relay having contacts movable between a
iirst position in which they permit the block in
dication means_to indicate that the stretch is
unoccupied and a second position in which they
prevent said block indication means from indi
eating:- >that the stretch is unoccupied, means op
erative on movement .of the contacts of said
polarized relays between their two positions to
40 cause the contacteer said auxiliary relay to oc
cupy their second position, and means effective
when transmission of control codes to the trañic
direction relays at both ends of the stretch is ini
tiated for-causing the contacts of said auxiliary
relay to occupy their iirst position.
.
¿ 5. Inl direction selecting means for a -stretch of
3. In direction selecting ,means forl Va stretch
of railwaytrackequipped ywitl'i’ a signaling sys
tem governed jointly lby code controlled traffic>
direction relays at opposite endsl of the stretch ,»
so that at times4 the stretchis conditioned fior
traflic in one direction'and at other "times is vcon
ñc _in one direction and at other times is condi
bination, Yelectroresponsive means at a control
oiiice capable of designating traffic in one direc
tion or the other and controlling circuits gov
bination, electror‘esponsive means at v a ’ control
oñîce capable of designating traiñc in4 one direc
tion or the other‘and controlling circuits gov'-vv
erning transmission of control codes to said traf -
ñc direction relays to' cause them to establish
traiiic in' thedirection designated'by said 'elec
said,V control oflice' for indicating whether said
stretch is occupied or is unoccupied,- an auxiliary
relay having contacts movable between a vfirst
position in‘which they permit the block indica
tion means to indicate that the stretch is unoc
cupied> and a second position in which they pre
vent said block indication means from indicating
that _the stretchL is unoccupied, a block indica
tion repeater relayh'aving contacts which occupy
a 'secondposition when the auxiliary relay con
tacts are _in their second_polsition and'whi'ch when
in theirsecond vpositionfmove to their ñrst posi;
tion whenfthe block indication means indicates
, that thepstretchis unoccupied, circuit means for
operatings'aid electrorespons’ive means to 'change
n that at times 'the stretch is conditioned for traf
Y tioned for tran‘ic in the other direction, in com
ditionedfor traiiic in theother directiom'in com-v
troresponsive means', block indication means at
railway track equipped with a .signaling system
governedjointly by code controlled traiiic direc
tion relays at opposite ends of the stretch so
(i ii
erning transmission of control codes to said tra-f
fic _direction relays to cause them to establish
traffic in the direction designated by said elec
troresponsive means, circuit means for operating
said eiectroresponsive means to change the desig
nated trafñc direction, anj auxiliary relay having
contacts movable between Aa iirst and a second
position, a starting relay for each end of the
stretch adapted when actuated to initiate. trans
mission of a control code to the associated end
ofV the stretch, a starting _button foreach start
ing relay, each starting button controlling a cir
cuit for actuating the associated starting relay,
means responsive to operation of said electrore
_ v sponsive means >to change the designated traiiic
direction forcausing thecontacts of said aux
iliary. relay> to occupy their second position, means
. effective when the contactsI of said auxiliary relay
are-intheir second position to establish for the
starting relay foreach end of the stretch a cir
j
2,411,387
2l ‘
cuit controlled by the starting button associated
with the starting relay forthe other end of the
stretch, and means effective when the starting
i
22
ing a pick-up circuit established when' the start
ing relays for -both ends of the stretch are actu
ated and having a stick circuit including its own
front contact, the `pick-up and stick circuits for
relays for both ends of the` stretch are actuated
to cause the contacts of said auxiliary relay to ,i said auxiliary relay being governed by said elec
occupy their iirst position.
6. In direction selecting means for a stretch
of railway track equipped with a signaling sys
tem governed jointly byl code controlled traf?c
troresponsive means so that the energy‘supplied
to said auxiliary relay over said circuits‘develops
flux of one polarity or the other in the “relay core
according as the electroresponsive means_desig
direction relays at opposite ends of the stretch
so that at ftimes the stretch is conditioned for
trañic in one direction and at other times is con
ditioned for trañic in the other direction, in com
bination, electroresponsive means at a control
oñice capable of designating traino in one direc
tion or the other and controlling circuits govern
ing transmission of control codes to .said traffic
direction relays to cause them to establish traf
nates tra?‘lc in one Vdirection or the other, and
a starting button for each starting relay, each
to indicate that the stretch is unoccupied and a
oihce capable of designatingtraffic in one direc
tion or the other and controlling circuits govern
ing transmission> of control codes to said trañic
direction relaysto cause them to establish traiñc
in the direction designated by said electrorespon
starting button controlling a circuit for actuat
ing the associated starting relay and also control
ling a circuit foractuating `the starting relay for
the other end of the stretch provided said auxil
iary relay is released.
‘
8. In direction selecting means for a stretch
of railway track equipped with a signaling sys
teni governed jointly by code controlled traiiic
ñc in the direction designated by said electro
responsive means, block indication means at said 20 direction relays at opposite ends of the stretch
so'that at times the Stretch is conditioned for
control office for indicating whether said stretch
traiiicin one direction and at other times is con
is occupied or is unoccupied, an auxiliary relay
ditioned fortrañic in the other direction, in com
having contacts movable between a first position
bination, electroresponsive means at a control
in which they permit the block rindication means
second position in which they prevent said block
indication means from indicating that the
stretch is unoccupied, a block indication repeater i
relay having contacts which occupy a second
position when the auxiliary relay contacts are 30 sive means, circuit means for operating said elec
troresponsive means to'change the designated
in their second position and which when in their
trame direction, aneutral auxiliary relay having
second position move totheir first position when
a pick-up circuit established when` transmission
the block indication means indicates that the
of control codesto both ends of the stretch is
stretch is unoccupied, circuit means for operat
initiated and having a stick circuit including its
ing said electroresponsive means to change the
own front contact, the pick-up and stick circuits
designated traffic direction provided said block
for
said auxiliary relay being governed by said
indication means indicates that the stretch is
electroresponsive' means so that` the energy sup
unoccupied or the contacts of said block indica
plied to said auxiliary ¿relay over said circuits
tionrcpeater relay are -in their second position,
a, starting relay for each end of the stretch 40 develops flux of one polarity >or the other in the
relay according as the electroresponsive means
adapted when actuated to initiate transmission
designates trañic in one direction or the other,
of a control code to the associated end of the
and a, starting button for each end of the stretch,
stretch, a starting button for each starting relay,
each starting button controlling a circuit for ini
each starting button controlling a circuit for ac
tuating the associated starting relay and also 45 tiating transmission of a control code to the asso
ciated end of the track stretch and also control
controlling a circuit for actuating the starting
ling a circuit for initiating transmission of a con
relay for the other end of the `stretch provided
trol code tothe other end of the stretch provided
the contacts of said block indication repeater
said auxiliary relay is released.
relay are in their second position, means respon
sive to operation of said electroresponsive means 50 9. In direction selecting means for a stretch
of‘railway track equipped with a signaling sys
to change the designated traflic direction for
tem governed jointly by code'controlled traino
causing the contacts` of said auxiliary relay to
direction relays at opposite ends of the stretch so
occupy their second position, and means effective
that at times the stretch is conditioned tor trañic
when the starting relays for both ends of the
stretch are actuated to cause the contacts of said 55 in one direction and at other times is conditioned
for trañic in the other direction. in combination.
auxiliary relay to occupy their ñrst position.
electroresponsive means at a control oñ’ice ca
7. In direction selecting means for a stretch
pable of designating traflic `in one direction or
of railway track equipped with a signaling sys
the other and controlling circuits governing
direction relays at opposite ends of the stretch so 60 transmission of control codes to said traltfic` direc
tion relays to cause them to establish traffic in
that at times the stretch is conditioned for traf
the _direction designated bysaid electrorespon
fic in one direction and at other times is condi
sive means, block indication means at said con
tioned for traffic in the other direction, in com
trol oñice for indicating Whether said stretch is
bination, electroresponsive means at a control
oiñce capable of designating traflic in one direc 65 occupied or is unoccupied, a neutral auxiliary
relay having contacts effective when picked up
tion or the other and >controlling circuits govern
to permit the block indication means to indicate
ing transmission-of control codes to said traffic
that the stretch is unoccupied and effective when
direction relays to cause them to establish traffic
tem governed jointly by code controlled traffic
in the direction designated by said electrorespon
sive means, Circuit means for operating said elec
released to prevent said block indication means
70 from indicating that the stretch is unoccupied, a
troresponsive means to change theV designated
traffic direction, a starting relay for each end of
the stretch adapted when actuated to initiate
transmission of a control ,code to the associated
end of the stretch, a neutral auxiliary relay hav 75
repeaterv relay `having contacts which` occupy a
iirst position when the auxiliary relay contacts
are released and which when in their first posi
tion- move to a second position when the block
indication means; indicates that the stretch is
2,41 1,387
23
unoccupied, circuit means for operating said
electroresponsive means to change the ydesignated
traiìc direction providedL said block indication
24
nated by said electroresponsive means is changed,
the auxiliary relay contacts being effective '
when in their first position to preventl the'block
means indicates that the stretch is unoccupied
indication' means from indicating that thev
or the contacts of said repeater'relay are in their Ci stretch is unoccupied and being movable to a
iirstposition, a pick-up circuit for said auxil
iary relay established when `transmission of con
trol vcodes to both ends of the stretch is initiated,
a stick circuit for said auxiliary relay including
its own iront contact, the pick-up and stick cir
cuits for said auxiliary relay being governed by
said electroresponsive means so that the energy
supplied to said auxiliary relay` develops ilux of
one polarity or the other in the'relay according
as` said
electroresponsive
means
designates
trañic in one direction or the other, and a start
ing button for each endof the stretch, each
starting button lcontrolling a ‘circuit for-initiat
ing transmission of a control code to the asso
ciated end of the stretch and also controlling a =
circuit for initiating transmission of a control
code to the other end of the‘stretch provided
said repeater relay contacts are in their first
position.
'
'
second position in which they permit the *block
indication means to indicate that the stretch
is unoccupied, circuit means for. operating said
electroresponsive means to change the desig
nated traino direction" provided said block in
dication means indicates lthat' the stretchis un
occupied, a starting' button for each endy of the
stretch, each starting button controlling a cir
cuit ior initiating transmission of a control code
to the associated end of the stretch and also
` controlling a circuit fo1` initiating transmission
of a control code to the other end of the stretch
provided the contacts of said auxiliary relay are
in their ñrst position,` and means effective when
transmission l of control codes to both ends of
the-stretch is initiated for moving the contactsv
of said auxiliary relay from their ñrst to their
second
position.
'
.
‘
10. In direction selecting means for a'stretch .
of railway track equipped with a signaling sys
tem governed jointly by. code controlled-traffic
direction relays at opposite ends oi‘the stretch
so that at times the stretch is conditioned for
traii‘ic in one direction and at other .times is f
conditioned >for trafûc in the other direction, in
combination, electroresponsive means at a con
trol oiiicecapable of` designating traffic in one
direction or >the other and controlling circuits
governing transmission of controlV codes to said
traflic direction relays to cause them to establish
traffic in the direction designated by said electro
responsive means, circuit means for operating
said electroresponsive means to change the desig
nated'traflic direction, an auxiliary relay asso
elated with said electroresponsive means and
governed so that its contacts are moved to a first
position y'whenever the direction of- traflic desig
nated by said electroresponsiveY means is
l2. In direction selecting means fora ’stretch
of railway track equipped with a signalingsys
tem including entering signals at opposite ends
of the stretcnwhich are governed by code con
trolled relays so that at times thesignal at one
end of the stretch may be cleared and Yat other
times the signal at the other end of the'stretch
maybe cleared, in combination, electrorespon
sive means at a controloiiice capablefof'desig
nating tralri’ic in one direction Vor the other and
controlling circuits governing transmission 0f con
trol codes to said signal control relays to cause
them t'o permit clearing of the signal governing
trañic in the dii‘ectiondesignated by said electro
responsive'means, an auxiliary relay associated
with said-‘electroresponsive means and governed
so that its contactsrare moved toa ñrst position
whenever the `«direction oi- traiiic designated by
said electroresponsive means is changed, a start
ing button for each end of the stretch,` each start-'
ing button controllingra circuit for initiating
changed, a'starting button for each end of the f` 'i
transmission of a-„control code to the associated
stretch, each starting button controlling acir
end of the stretch and also controlling a circuit
cuit for initiating transmission of a control code
for initiating transmission of a control code `to
to the associated end of the stretch and also
the other end `of >the’ stretch provided the con»A
controlling a circuit for initiating’transmission
tacts oi' said auxiliary relay' are in their first
of a control code to the other end of the stretch 'to position, and ’means effective lwhen transmission
provided the contacts of said auxiliary relay are
of control codes to both ends of the stretch is
in their ñrst positionjand means effective when
initiated for moving the contacts of said auxiliary
transmission of control _codes to both ends of the
relay from their ñrst to their second position. '
stretch is initiated for moving the` contacts of
i3.Av In direction selecting means for a stretch
said auxiliary relay from their ñrst to 4their '
of railway track equipped with a signalling system
second position.
»
~
11. In direction selecting means for a stretch
of railway track equipped with a signaling sys
tem governed ljointly by code> controlled trailic
direction relays at opposite ends of the stretch
so that-at times the stretch is conditioned for
traflic in one ‘direction and at other times is con
ditioned for tra?lic in the other direction, in com
bination, electroresponsive means at a control
oiiice capable of designating trañic in one 4direc
tion or the' other and controlling circuits lgovern
ing transmissionr of control codes 'to said trafiic
direction relays to cause them to establish traffic
in the direction designated by said electrore
governed jointly by code controlled relays at op
posite ends of the stretch, the equipment at each
end of thefstretch being capable of conditioning
the associated end of the stretch to be an exit
>or an entranceA end, in combination, «electrore
sponsiveameans at a control oiiice capable of des
ignating traffic in one direction or the other and
controlling circuits governing transmission of‘
control codes to said code `controlled relaysï to
cause them to establish traffic inthe direction
designated by said electroresponsive means, >block
indication means at said control oiiice for indi-y
cating whether said stretch lis occupied or is un
occupied, an auxiliary relay having contacts mov
sponsive'means, block indication means at said 70 able between a first position in Which'they permit
control oiilce ior indicating whether said stretch
the block indication means to indicate that the
is occupied or. is‘unoocupied, an`> auxiliary relay
stretch is unoccupied and a second position in
associated with said electroresponsive means-and
governed so that its contacts are moved toa first
position Whenever the direction of traffic Vdesig
which they prevent said block indication l'means
from Aindicatingr thatV the `stretchÍ is unoccupied,
means 'for' ` governing said` auxiliary relay' t'o cause
" 2,411,387
25
I its contacts to moveto their second position when
ever the direction of traii'ic designated by said
`means effective when transmission `of control
codes to lbothends of the stretch is initiated
for moving the contacts oi said auxiliary relay
to their ñrst position.
electroresponsive means is changed, a switch lock
control member having a normal position from ,
which it is movable to an unlocked position in `
15. ‘In direction selection means for a stretch
or railroad track having at one end a first de
tector section and having at the other end a sec-`
which it controls the circuits governing trans
mission of control codes to said code controlled
relays to cause the relays at both ends of the
ond detector section, said track stretch being
equipped with signalling apparatus governed
jointly 'by code controlled traffic direction relays
stretch to condition the associated end of the ,
stretch to be an exit-end, a repeater relay having
at opposite ends of the‘stretch so that at times the
contacts which are moved to a second position
stretch is conditioned for traffic in one direction
and at other times is conditioned for traiilc in
when the auxiliary relay contacts are in their
second position provided said switch lock member
is in its normal position and which when in their
the other direction, in combination, electrore
sponsive means at a control oñice capable of des
ignating trañic in one direction or the other and
second position move to their iirst position when i
the block indication means indicates that the
stretch is unoccupied, circuit means for operat
ing said electroresponsive means to change the
designated traiiic direction provided said block
indication means indicates that the stretch is
unoccupied or the contacts of said repeater relay
are in their second position, and means effective
when transmission of control codes to both ends
of the Stretch is initiated for moving the contacts
controlling circuits governing transmission of con
trol codes to said trailic direction relays to cause
>them to establish tramo in the direction desig
nated by said electroresponsive means, block in
of said auxiliary relay to their iirst position.
14. In direction selecting means for a stretch
of railway track equipped with a signaling sys~
dication means at said control oilice for indicat
ing occupancy of said stretch, detector section in
dication means at said control office for each of
said detector sections for indicating occupancy
thereof, a block indication repeater relay having
contacts which are moved from a first to a sec
ond position on operation of said electrorespon
sive means to change the designated trafñc di
tem governed jointly by code controlled relays at
rection and which are moved from their second
opposite ends of the stretch, the equipment at
each end of the stretch being capable of condi 30 to their ñrst position when said block indication
means indicates that said stretch is unoccupied
tioning the associated end of the stretch to be
or said detector section indication means indi
an exit or an entrance end, in combination, elec
cates that a detector section is occupied, and
troresponsive means at a control oiiicè capable
circuit means for operating said electrorespon
of designating traiìc in one direction or the other
sive
means to change the designated traiîlc di
35
and controlling circuits governing transmission
rection provided said block indication means in
of control codes to said code controlled relays to
dicates that the stretch is unoccupied or -the con
cause them to establish trañic in the direction
tacts
of said repeater relay are in their second
designated by said electroresponsive means, block
position.
indication means at said control oflice for indi16. In direction selection means for a stretch
eating whether said stretch is occupied or is un 40
of railroad track having at one end a ñrst detector
occupied, an auxiliary relay having contacts mov
section and having at the other end a second de
able between a ñrst position in which they per
mit the block indication means to indicate that
the stretch is unoccupied and a second position
in which they prevent said block indication means
from indicating that the stretch is unoccupied,
means for governing said auxiliary relay to cause
its contacts to move to their second position whenn
ever the direction of trailic designated by said
electroresponsive means is changed, a switch lock
control member having a normal position from
which it is movable in either direction to positions
in Which it controls the circuits governing trans
mission of control codes to said code controlled
relays to cause the relays at both ends of the 55
tector section, said track stretch being equipped
with signaling apparatus governed jointly by code
controlled tramo direction relays at opposite ends
of the stretch so that at times the stretch is con
ditioned for traii'ic in one direction and at other
times is conditioned for traffic in the other direc
tion, in combination, electroresponsive means at
a control office capable of designating traffic in
one direction or the other and controlling circuits
governing transmission of control codes to said
trañ‘ic direction relays to cause them to establish
trañic in the direction designated by said elec
troresponsive means, block indication means at
said control ofñce for indicating occupancy of
said stretch, detector section indicationsv means
at said control office for each of said detector sec
tions for indicating occupancy thereof, a block in
stretch to condition the associated end of the
stretch to be an exit end and in which if said
block indication means indicates that the stretch
is unoccupied said member governs circuit means
to cause said electroresponsive means to desig 60 dication repeater relay having contacts which
are moved from a ñrst to a second position on
nate traffic in the direction determined by the
operation of said electroresponsive means to
direction in which said switch lock control memn
ber is moved from its normal position, a repeater
relay having contacts which are moved to a sec«
change the designated trañic direction and Which
are moved from their second to their ñrst posi
ond position when the auxiliary relay contacts 65 tion when said block indication means indicates
that said stretch is unoccupied or said detector
are in their second position provided said switch
section indication means indicates that a detector
lock member is in its normal position and which
section is occupied, and circuit means for operat
when in their second position move to their iirst
ing said electroresponsive means to change the
position when the block indication means indi
cates that the stretch is unoccupied, other circuit 70 designated traffic direction provided the detector
section indication means shows the detector sec
means for operating said electroresponsive means
tions to be unoccupied and also provided said
to change the designated traflic direction provided
block indication means indicates that the block
said block indication means indicates that the
is unoccupied or the contacts of said repeater
stretch is unoccupied or the contacts of said
relay are in their second position.
repeater relay are in their second position, and
2,411,387
17. _Direction selecting apparatus for control
lingvtrafric movements over- a stretch of single
track railway equipped with a reversible signal-_
ing system, said track stretch having at one end
a ñrst detector section and having at the other
end'a second detector section, electroresponsive
means at a control oñ'ice capable of designating
traiiic in one direction or the other, a code coin
28
'
direction for moving the contacts of said repeater
relay from their first to their second position and
for operating said block indication relays to the
positions which they assume in response to re
ceived codes indicating that the stretch is oc
cupied, means for moving the contacts of said
repeater relay from their second to their first
position when indication codes are received to
munication` system for transmitting manually in
operate the block indication relays to the posi
itiated control codes reflecting the conditionìof 10 tions which they assume when the stretch is
said electroresponsive means to stations at the
unoccupied or when an indication code is re
ends of said stretch to control said signaling sys
ceived that one of said detector sections is oc
tern and for automatically transmitting indica
cupied, and circuit means for operating said elec
_tion codes from said stations reflecting the condi
troresponsive means to change the designated di
tion of occupancy of the stretch to control block 15 rection of traiiìc provided said block indication
indication relays at the office and reflecting the
relays are in the position which theyassume in
condition of occupancy of said detector sections
response to received codes indicating that the
to control detector section indication relays at
stretch is unoccupied or the contacts of said re
the oñice, a repeater relay at said control oflice,
peater‘relay are in their second position.
means effective when said electroresponsive
FRANK T. PASCOE.
means is operated to change the designated trafñc 20
ARTHUR L. JEROME.
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