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Патент USA US2126210

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Aug. 9,1938.
N. D. PRESTON
2,126,210
CENTRALIZED TRAFFIC CONTROLLING SYSTEM FOR RAILROADS
Original Filed May 24, 1933
3 Sheets-Sheet‘ 1
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INVENTOR
Aug. v9, 1938.
N. D. PRESTON
2,126,210
CENTRALIZED TRAFFIC CONTROLLING SYSTEM FOR RAILROADS
Original Filed May 24, 1933
3 Sheets-Sheet 2
Patented Aug. 9, 1938
2,126,210.
UNITED STATES”
PATENT OFFICE
2,126,210
CENTRALIZED TRAFFIC CONTROLLING
' SYSTEM FOR RAILROADS
Neil D. Preston, Rochester, N. Y., assignor to Gen
eral Railway ,‘Signal Company, Rochester,
Application my 24, ‘1933, Serial No. 672,652
,
Renewed‘ January 3, 1938
13 Claims. (Cl. 246-—-5)
This invention relates to systems for governing tion with the transmission of inbound indications
tra?ic on railroads and it more particularly is thoroughly disclosed in the above mentioned
pertains to systems known as centralized tra?ic application No. 640,062, the present description
controlling systems.
will be directed entirely to the transmission of
In a centralized trailic controlling system of the outbound calls from a typical control o?ice to a
type contemplated by this invention, communica-‘-‘ typical ?eld station.
tion is established between a central control o?ice
In the case of a ?eld station having two track
and a number of outlying ?eld stations by means switches, for example, with the necessary signals
of a station selective coded type of communication for governing traffic thereover, there are six possi
system. In a communication system of this type, ble routes over the track switches which may be 10
a plurality of series of impulses of different'c'o‘de set up in different combinations at any one time.
combinations‘ are transmitted over the line‘ cir~ Where the number of switches and signals in a ’
cult connecting the control office and’the‘?eld track layout at one location is more than can be
stations. The ?rst portion of each different series conveniently controlled in one operating cycle, it
of code combinations is employed for selecting the
stations, while the later portion of'eacn diirer‘ent
series of code combinations is employed to con‘
trol the tra?ic controlling devices vat ‘the selected
station.
20
‘
I
'
1
.
’
A centralized trailic controlling system in which
the present invention is useful, has the switches
and signals at various stations along a railroad
becomes necessary to provide some means to pre 15
vent clearing signals over wrong routes.‘ For ex;
ample, referring to the typical arrangement of
two switches shown in Fig. 3 and assuming that
switch ITS is in its reverse position, switch 2TS
is in its normal position and that the operator de 20
sires to clear the route over both switches reversed.
Under these conditions, if a control code is trans
system placed under the control of an operator in ' mitted to clear signal IAE, this signal may show
the control office in such a ‘way’ that he‘ may
25 change the positions of the switches, subject to
automatic approach and detector locking circuits
which prevent unsafe operation of any switch.
He may also hold any of the signals “at stop” or
allow them to clear, dependent upon the positions
3.0 of the associated switches and also provided the
clear before switch ZTS- is reversed thereby dis
playing the wrong route indication." A feature of
the present invention contemplates checking the
reception of‘ switch controls before permitting
clearing of signals.
In the present invention, it is proposed to ar
range a portion of the cycle for the transmission
location of trains makes it safe for a signal to
of a message indicating whether or not a switch 30
indicate proceed.
lever in the control oiTlce has been shifted to a
new position so that transmission, proper execu
In a centralized tra?ic controlling system of the
type contemplated by this invention, various indi
cations are displayed in the control of?ce to indi
cate the presence or absence of'tr‘ains on the vari
ous track sections and to indicate the operated po
sitions of the various switches,sign_als andthe like.
In a system as above outlined, the various
tion and registration of the switch controls must
occur before a signal can clear. More speci?cally,
if a switch lever has been moved to a new position, one cycle of operations is effective to select
a particular ?eld station and to transmit a code
‘combination for preparing the proper signal clear
switches and signals at the'passing siding's or
the like which are distributed throughout the
territory are grouped in what may be conveniently
termed ?eld stations, which usually include those
ing circuit at the “selected station. Thereafter
an additional cycle is effective for controlling
traffic controlling devices located near or ‘ade
as jacent each other. The communication system
which interconnects ‘the control oilice‘ with ‘the
various ?eld stations for the transmission of
controls and indications is preferably of ‘the coded
duplex type, as disclosed for example in the pend
In many cases the signals may be cleared over
a particular route without operating any of the
switches to new positions. In this event it is
undesirable to transmit a cycle for controlling
switches and a further feature of the present in
vention contemplates the operation of the sys
40
50
ing application‘ of Judge and Bushnell, Ser. No.
640,062 ?led October 28, 1932, corresponding to
British Patent 419,399,
A communication sys
tem of this type is operable'through cycles of
operation during which a code call'is transmitted
for the selection of ‘the desired station, after which
the controls are transmitted to the individual
60
traffic controlling devices at‘that station.
Since the present invention‘is‘ particularly di
rected to the transmission of outbound controls
and since the'oper'ation of, the system in connec
the switches at the selected‘station ‘and for com
pleting the ‘signal clearing circuit.
tem through only one operating cycle if signals .50
are to be cleared without the operation of any
switch or switches. Such an operating cycle is
eifective to transmit signal controls alone.
These characteristic features of the invention
thus brie?y stated will ‘be explained more in de 55
tail in the following description of one embodi
ment and the various functions and advantages
of a system employing this invention will be in
part pointed out and in part apparent as the
description
progresses.
>
-
>
'
,
60
2
2,126,210
trol o?ice and includes a three-position polarized
biased-to-neutral line relay F in the control o?ice
and a similar relay F1 at each ?eld station.
sociated signals but it should be understood that, , H The transmission of a series of distinctive im
the invention is not limited as thus shown, since it ' pulses over the control line circuit results in the
synchronous step-by-step operation of a step
may be readily applied to all types and combina
ping relay bank at the control oi?ce and at each
tions of track layouts.
" '
'
'
In describing the invention in detail, reference ?eld station, irrespective of the polarity of the
will be made to the accompanying drawings in impulses. The polarity of the impulses deter
mines the particular. ?eld station to be selected
10 which similar parts throughout the several views
are designated by similar reference characters, during the ?rst part of the operating cycle, while
the polarity of the impulses during the later
some of which are provided with distinctive ex
ponents to indicate the location of the associated part of the operating cycle determines the con
apparatus in the system and some of which are trols to be transmitted to the selected ?eld station.
For the transmission of indications to the con 15
15 provided with distinctive ordinals to indicate the
order of operation of the particular device with trol o?ice, only one ?eld station at a time is per~
which the reference character is associated and mitted to transmit over the indication line cir-'
cuit during any particular operating cycle as
in which:-—
determined by some suitable lock-out arrange
Fig. 1 illustrates the apparatus and circuit ar
ment. This selection of a ?eld station for per 20
rangement provided as a portion of a typical con
trol o?ice equipment constructed and arranged mitting it-to transmit indications is immaterial
for an understanding of the present invention
according to the present invention.
and therefore has been omitted.
Figs. 2 and 3 when placed end to end, illus
Control oj?ce equipment-The control o?ice
trate the apparatus and circuit arrangement em
ployed at a typical ?eld station for providing the (see Fig. 1) includes a control machine having 25
a group of control levers for'each ?eld station,
control of a plurality of track switches and sig
nals at a single location in accordance with the together with suitable apparatus and circuits to
present invention and adapted to be associated accomplish proper functioning of the system.
with the apparatus employed in the control o?ice. Fig. 1 illustrates diagrammatically only a por
In considering the detailed operation of the tion of such a control machine, which is typical 30
30
of the apparatus associated with a track section
system employed in the embodiment of the pres
ent invention, Fig. 1, Fig. 2 and Fig. 3 should be comprising two track switches as illustrated in
placed end to end in the order named with corre— the upper right hand portion of Fig. 3.
The apparatus for the two track switches com
spondingly numbered lines in alignment.
prises switch machine control levers ISML and 35
For
the
purpose
of
simplifying
the
illustrations
35
and facilitating in the explanation, the various ZSML, a signal control lever SGL and a self-re
storing starting button SB. The movement of a
parts and circuits have been shown diagram
matically and certain conventional illustrations switch machine control lever to one extreme po
have been employed, the drawings having been sition or the other results in the normal or re
verse operation of the corresponding track switch
40 made more with the purpose of enabling a clear at the corresponding ?eld station through the me 40
understanding of the principles and mode of
operation to be obtained, rather than with the dium of the communication system. The move
idea of illustrating the speci?c construction and ment of the signal control lever from its interme
arrangement of parts that would be actually em— diate or full line position shown in Fig. l (which
corresponds to signals “at-stop”) to the right or
45 ployed in practice. The various relays and their left dotted positions clears a signal for tra?ic over 45
contacts are illustrated in a conventional man
In the accompanying drawings, the invention
has been shown applied to a track layout at a
single location having two track switches and as
ner and symbols are used to indicate the con
nections to the terminals of batteries or other
suitable sources of current, instead of showing
50 all of the wiring connections to these terminals.
The symbols (+) and (—) indicate the posi
tive and negative terminals respectively of suit
able batteries or other sources of direct current
and the circuits with which these symbols are
55 used always have current ?owing in the same
the associated track switch in an eastbound or a
westbound direction respectively, through the
medium of the communication system.
The movement of the signal control lever and 50
the subsequent operation of the associated start
ing button without the movement of an associ
ated switch machine lever, results in a single
cycle of operations of the communication system,
during which a code combination of one class is 55
direction. The symbols (B+) and (B——) indi
cate connections to the opposite terminals of a
transmitted and the signal is cleared at the end
suitable battery or other direct current source
chine levers is actuated and the signal lever is
positioned to clear a signal, followed by the op
which has an intermediate tap (CN) and the
6,0 circuits‘with which these symbols are used may
- have current ?owing in one direction or the other,
depending upon the particular terminal used in
combination with the intermediate tap (CN).
Communication system in generaZ.—For the
65 transmission of controls, a transmitting equip
ment is located in the control office and a re
ceiving equipment is located at each of the vari
ous ?eld stations. These receiving equipments
are connected to the transmitting equipment by
70 a suitable communicationline circuit comprising
of the cycle.
If one or both of the switch ma
eration of the starting button, then the code 60
combination is transmitted to the selected ?eld
station for preparing the signal clearing circuit
during a ?rst cycle of the communication system.
No switch machine control is transmitted during
this ?rst cycle under this condition, but the sys 65
tem goes through a second cycle during which
the transmission of a code combination of an
other class takes place which includes switch
controls. The signal clearing circuit is completed
at the end of the second cycle.
70
a control line and a return line. In the drawings,
Checking relay WCK, normally energized over
the control line is identi?ed by the reference
character I0 and the return line by the reference
character I2. The control line circuit is used
75 for the transmission of impulses from the con
its stick circuit, is dropped when a cycle is initi
ated during which switch controls are to be
transmitted as determined by a change in the
‘position of a switch machine lever. Signal
3
2,126,210
change or starting relay SGCH picks up "when
‘the associated ‘starting button is actuated and
stores‘. the condition that the associated station
is to be selected.
Switch‘change or starting re
lay SMCI-I is picked up to store the condition
that a lever has been moved from one ‘position
to another. In other words, these two starting
relays when picked up cause the communication
system to go through ‘cycles of operations, only
one cycle being effected if relay SGCH is picked
up alone, while two cycles are effected if "both
relays SGCH and SMCH are picked up to initi
ate the system.
Signal code determining relay S'GCD and switch
machinecode determining relay SMCD associated
with a particular ?eld station ‘are controlled ‘by
their respective change relays in such a way that
. the signal code determining relay determines the
code combination which is transmitted during
the ?rst cycle and the switch machine code de
termining relay determines the combination
which is transmitted during the second ‘cycle.
The interlocking ‘circuits of these two relays are
such that only one of them can be ‘picked up at
any onetime, with relay SGCD having preference.
governs 'tra?ic-overthe upper track onto the main
track by ‘way of the center track.
'
Each signal is ‘associated with a signal control
‘relay, ‘for example, ‘the signal-control relays IEG to
and ~IAEG clear signals ll‘E and IAE‘ respectively
when ‘these relays are ‘picked up and when they
are dropped *the corresponding signals 'are put to
stop. Likewise, relays :IWG, IAWG and IBWG
clear signals IW, 1 AW and lBW respectively when
these relays are picked up and the respective
signals are put tovstop when the corresponding
relays are dropped.
.
The signal control relays TIEG, ‘IAEG, IWG,
I AWG and 'IBWG are governed from the control 20
office through the medium of the communica
tion system. Each signal relay is dependent forits
energization ‘upon the tra?ic direction relay TD
being properlypositioned, as well as proper corre
spondence between the switch relays and the
Relays EP, F‘P, ZFP, SA, ZSA, PC, NC and C
switch machine repeating relays.
correspond to similar relays in the above men
When all of the signals are at stop, relay M is
energized through a circuit which includes back
contacts on each of the signal control relays.
tioned prior ‘application Ser. No. 640,062 and
since the operation of these relays, ‘as well as the
operation of the stepping relay ‘bank, has been
thoroughly explained in this prior application,
a detailed description of their functioning will
not be given here.
The ‘control office equipment also vincludes a
a
nals *I-E and sli‘lE governre'a'stbound ‘tra?ic over
the ‘track switch 'ITS over the main track and
onto the turn-out track respectively. ‘Signal IW
governs west-bound tra?ic over the main track,
signal IAW governs westbound traffic 'over the
center ‘track onto the main. track and signal ~|BW
line battery CB for supplying positive and nega
tive potential to the line circuit in accordance
‘with the positions of positive control relay PC
and negative control relay NC‘.
Field‘ station equipment-With reference to
the typical ?eld station equipment shown in Figs.
2 and 3, two turn-out tracks “have "been shown
controlled by means of track switches ITS and
2T8. These track switches are ‘suitably controlled
Checking relay CK, normally energized by means
of its stick circuit, permits clearing of signals
during a cycle for the transmission of signals
alone. rIfhis relay is dropped during a signal
control cycle if this cycle is to be followed by a
switch control cycle,- so that clearing of signals
is prevented in this case until the proper switch
controls have been transmitted.
Clearing relay CL is for the purposeof energiz
ing the signal clearing ‘circuit and when this re
lay is picked up it is stuck up until the associated 40
track section becomes occupied or until a stop
signal ‘code is transmitted for picking up stop
relay SP. Signal station relay SGST and switch
from one extreme position to! the other by suit
able switch machines (not shown) such for ex
ample, as in the patent to W. K. Howe, No.
machine station relay SMST correspond to the
1,466,903 dated September 4, 1923. These switch
office, since relay SGST is picked up during a
cycle for the transmission of signal controls and
relay SMST is picked up during a cycle for the
transmission of switch controls. Code receiving
relays IPC, 2PC and 3P0 record the positive
impulses applied to the control line and code
machines are in turn controlled by switch ma-
signal code determining‘ and switch machine code 45
determining relays respectively in the control
chine relays lS-MR and ZSMR, subject to suitable
approach locking means and since the detailed '
circuit arrangements for this control is imma
terial to ‘an understanding of the present inven—
tion, the: control of the track switches through receiving relays INC, 2N0 and 3NC record the
the medium of the switch machines has been negative impulses applied to the control line, these
merely indicated by means of dotted lines ex
relays being selected on the ?rst three steps after 55
tending from the contacts of the switch machine station selection by means of stepping relays 3V1,
relays to their associated track switches.
4V1 and 5V1. These code receiving relays record
The positions of the track switches are indi
the polarity of the code impulses and by means.
cated by the usual switch repeating relays llWP of circuits made up through their contacts, proper
and ZWP which are of the polar neutral type, selection is made of the various control relays,
energized with a particular polarity so that their all of which will be pointed out in the detailed
polar contacts are positioned to the right when description.
the associated switch machine is in its normally
Executing relay EX is picked up on the sixth
locked position and to the left when the corre-. step, which step follows the registration of the
sponding switch machine is in its reverse locked _ code which positions the code receiving relays.
position. The neutral contacts of these relays Relay EX controls certain detailed executing cir
drop to their deenergized positions when the cor-' cuits as will be more clearly explained in con
responding switch is unlocked or is in operation. nection with the detailed description.
These switch repeating relays are likewise indi
Relays FPl, SA1 and the stepping relays cor
cated as being controlled from the corresponding respond to similar relays in the above mentioned
‘ track switches by means of dotted line connec
prior ‘application Ser. No. 640,062 and since the
tions instead of showing the detail-ed circuit ar- _ operation of these relays may be the same as dis
rangements of such control.
Associated with the track section is the usual
track relay T and track repeating relay TP. Sig
closed in this prior application, a detailed dis
cussion relating to this portion of the system will
not be given here.
75
2,126,210
4.
It is to be understood that although the ?eld
station has not been shown as having indication
transmitting means nor has the control oflice
been shown as having indication receiving means,
a complete system as contemplated to be em
ployed in accordance with the present invention
would have such features. However, for the pur
pose of describing the present invention, such
10
features are considered as immaterial.
It is believed that the nature of the invention,
its advantages and characteristic features can be
best understood with further description being set
forth from the standpoint of operation.
Operation
15
The system is normally at rest but may be
initiated by the operator for the transmission of
controls in the manner fully set forth in the above
mentioned ‘prior application, Ser. No. 640,062.
Front contact 21 on relay SGCH of Fig. 1 corre
25
sponds to front contact 21 on relay ICI-I of Fig. 5
in the above mentioned prior application and
since front contact 28 on relay SMCI-I of Fig. 1
is in multiple with front contact 21, the picking
up of either one or both relays SGCH and SMCI-I
initiates the system.
7
'
It will be assumed that the system steps
through cycles of operations as longv as one of
these change relays is picked up and an explana
tion will be given of the features and operation of
30 the present embodiment which more particularly
pertains to the transmission of controls to a
selected station after the station selecting steps
have been marked oil. In this connection, it
is assumed that the station illustrated in Figs.
35 2 and 3 is selected on the ?rst two steps of the
cycle and that the third, fourth, ?fth and sixth
steps are employed for the transmission of the
code combinations to the selected station.
With the possibility of having either a posi
40
tive or a negative impulse for each step of the
communication system, the number of code com
binations is equal to'two (2) raised to the power
of the number of steps. In the present illustra
tion, three steps have been employed for the
route control codes and with the impulses for
these three steps arranged in code combinations,
eight different codes are used, two of which are
in the group of combinations conveniently re
ferred to as of the ?rst class, that is, where the 10
communication system steps through only one
cycle of operations. The remaining six code com
binations are conveniently referred to as of the
second class, in which the communication sys
tem steps through two cycles of operation for
each code combination.
By referring to the table given below, it will be
noted that the ?rst code (third step) is always
(+)’ for the ?rst cycle and (—-) for the second
cycle. The second code (fourth step) is (+) for
the combinations of the ?rst class, as determined
in the control office by the fact that no switch
machine lever is moved to a new position and
repeated at the ?eld station by maintaining the
checking relay in its picked up position. The
second code of the ?rst cycle is (-) when a
switch machine lever is moved to a new position
requiring the transmission of a second series of
impulses. The third code (?fth step) is (+) or
(—) for the ?rst cycle as determined by the di
rection of tra?lc to be cleared at the ?eld station.
The second code (fourth step) of the second
cycle is (+) or (-) as determined by switch ma
chine lever ISML in its normal position or its
reverse position respectively. The third code im
pulse (?fth step) of the second cycle is (+) or
(-—) as determined by switch machine lever
ZSML being in its normal position or its reverse
position respectively.
40
Table of code‘ combinations (?rst class)
Code number
Third
Step
Fourth
step
Fifth
step
Code use
45
No switch lever changed.
Clear signal east.
+
+
N 0 switch lever changed.
Clear signal west.
Table of code combinations (second class)
v50
Code number
1. lst cycle.
Third
Step
+
Fourth
step
Fifth
’ step
+
55
3. 1st cycle_
2nd cycle _______ _ _
4. lst cycle_
2nd cycle _______ _ .
5. 1st cycle_
2nd cycle _______ _ _
6. 1st cycle_
2nd cycle _______ _ _
Switch lever changed.
Select signal east.
Clear signal east.
Switch lever changed.
Select signal west.
2. 1st cycle_
60
Code use
Position switch No. 1 normal.
2nd cycle _______ __
2nd cycle _______ _.
50
+
Position switch N o. 1 normal.
Clear signal west.
Switch lever changed.
Select signal east.
60
Position switch No. 1 reverse
(No. 2 normal).
Clear signal east.
Switch lever changed.
Select signal west.
Position switch No.
(No. 2 normal).
Clear signal west.
Switch lever changed.
Select signal east.
1 reverse
Position switch No. 1 reverse
(N o. 2 reverse).
Clear signal east.
Switch lever changed.
Select signal west.
70
Position switch N o. 1 reverse
(No. 2 reverse).
Clear signal west.
75
5,
2,1265210
In‘ other words‘, if two or more change relays
are up at the same time; the signalcode de
_ Station selection“ andLsi‘ep-byastep operation.
At the beginning of thecycler relay‘ FF is ener
gized by polar contact 61: in; either: avrightzor a
termining relay such-as relay SGCD nearest the
(+) end of thelcircuit including conductor l9
left hand position, dependingupon the‘, polarity
has-preference;
with. which line Ill‘ is energized. The closure of
front contact ‘68‘ of relay"FPvenergizes relay
ZFP ‘which in turn. energizes» the slow acting re
lay SA by closing front contact 69. Relay SA
picks up after a short time. intervali and closes
1,0 a circuit by way of its front contact l'lllifor pick‘
ing. up relayg‘ 2SA.. Rielays SA; and.‘ ZSA. remain
picked up throughout the cycle ofloperation‘s
until a predetermined period ofntime after; the"
control line has been deenergized at the end. of
1,5
the:
cycle.
-
.
,_
I
,
.
,
.
.Relays F1, FPl, SA1 and S01 atvt'he. ?eldl sta
tion are picked up‘ at. the beginning of the cycle;
Relay FPl repeatsthe impulses‘ in. the. line cir
cuit irrespective of theirzpolarity while relay? F1
20 is positioned to the rightiby. a: (+)J impulse. and‘
to the left by a‘ (—.), impulse. .Relay S01‘ re
'
~
~
IIl’he picking‘ up= of relay SGClDlA closes a stick
circuit for itself extending from (+)‘, back con
tact 2B- of relay 2S‘A, aback contact 21“ of relay .
SMCD, front contact 22? and winding of relay
SGCD, to: (~—). Since relay‘ SA‘ is picked up
before: relay ZSAythis stick circuit is maintained
energized through‘ front contact 2'3.v of relay SA
after the picking up of relay 28A‘, so. that relay
SGCD? remains stuck up until: the end of the
cycle. Since relay SA is dropped. before‘ relay 15
2SA at the end ofethe. cycle, this stick circuit
isldeenergizedv for a suf?cient. period of time‘ to
allow‘ relay SGGD‘ to ‘ drop.
; The picking. up‘ of- make-beforehbreak contact
E3‘ of relay? SGCD transfers. the stick circuit of 20
relay 'SGCH from (+), to (+) through back
contact 241 of“ relay 2FP. When relay Z-FP is
picked up this. stick‘ circuit is deen'ergized before
relay SA‘ picks' up its contact l5, so' that relay
SGGH is“ deenergize'd- and since front contact I5 25
of: relay SA- is immediately‘ closed relay- SGCH
may again; be. picked up? and‘ stuck up‘ to store
the conditionr‘that starting‘ ‘buttonSB' has been
mains‘ picked up at‘ thevselected station until
the end of, the cycle and‘. relay SAl remains
pickedup until a. predetermined period‘. of; time‘
2.5; after the. ‘control line-has been deenergizedv at
the end of the cycle.
.
.
.
e .
Upon the ?rst deenergizationx of the. control
line (following its ?rst" energizationoi as“ repeated
actuated.
1
.
.
by relays FF and FF“, the ?rst stepping relay is again
After the‘ dropping of‘. contact l8? of’ relay
30 picked up and. similarly, during each following SGCHL the picking up‘of another (ED-relay- such
deenergized condition: of'the: control line av su'ce; as relay‘v SM'JDv isprevented, even though front
ceeding» steppingrelay isipicked: um, so P that‘. after
contact 25' of relay SM'CH is; closed’ because the
the station hasubeen selected by the‘ continued‘ series pick-up circuit including conductor 19* is
energization. of relay $01,. the. control steps are‘ deenerlgized» at back‘ contact I51 of relay‘ SA;
35 then taken. which. include. stepping; relays 3M1‘,
Assumingrelay 3V‘picked1up'on thathird step,
4V1, 5V1 and‘ 6V1. atthe selectedlstation; It will arcircuit is closed for picking up relayv PC which‘
be understood‘ that‘ relays SGGD» andtSMGD extends from (+), front contact Ill of relay C
have multiple sets of , contacts: soithatv either‘ one
(corresponding to‘: front contact 4+ of relay 0
picked up, controls; station- selection. during: the? in the above‘ mentionedi prior application Ser. 40
?rst
steps
.of
the
cycle
‘
intthe
samelma-nnerv
thatl
40
No. 640,062~)>,.back contact 43 of relay“ 6V, back
relay I‘CD controlslthe. selection of‘. a. station in contact 44‘ of- relay 5V, back contact 45 of relay
the above mentioned; prior application" Ser. No‘. 4V, front contact 42 of relay‘ 3V, control bus
640,062.;
.
‘
~
,
_1
?ll," front contact‘46-of' relay- SGGD; (+) control
Single signal‘ clearing cycZe.‘-—It- will now be
assumedthat the operator: desires toiclear signal’
bus 41‘ and winding of‘ relay PC‘, to- (—).
l-Exfor traffic‘ over the .main: track“ in‘ an east‘
the.,next energization Of’lihq control line,‘.-since
wardtdirectionz (seeilE‘ig'. 3);: Since; switch ma-i
chine leversllSMLand12SlVlL are inv their normal
45
The picking up ofrelay BC preselects (+) for
the (+) terminal of battery; CBlextends through
back ‘contact. 5|]. of relay NC,.ffront. contact
51!‘ of' relay PC, back contact 52“ of' relay El?
and winding- of relay F to line conductor Ill.‘
Relay
F1 at’ the ?eldstation/is positioned to the
machine lever so that; the operation of signal? right‘ which closes a circuit‘ for picking. up relay
lever SGL‘to its-right‘ dottede'linel'position i's‘efl
lP'C‘extending ‘from (+7, front‘ contact H8‘ of
fective to ‘transmit. a... code for-nclearing‘ signal.- IE I
positions, trackswitch'esa ITS; and 2TB :wilLbe as;
sumed' to be‘ inxtheirno'rmal' positions.‘ Ink this
50 event; it is: not necessary ‘to-operate? a‘ switch
relay‘ S01,’ contact‘ “'4 of relay F1 in. its right 55
hand‘ dotted position, b'ack contacts‘ llll; HI’
After lever. SGIi .‘is- moved‘to ‘its. right position, and H2‘ of relays 6V1,‘ 5V1 and 4V1'resp‘ectively,‘
the starting; button SBis actuated which closes‘ front contact‘ N5 of relay"3V1“an‘d winding of‘
a circuit for picking up relay SGCHi which ex» relay‘. IPC", to (‘-L)‘. Relay IPC closes‘ a‘ stick‘
tends from‘. 0+) , front contact: H‘ of button SB
circuit‘for“ itself‘ extending from‘ (-1-); front con 60
and winding of relay SGCH,1to (—). Relay‘ tact N3’ of relay“ sAlyfront contact 'IIB” and
60
SGCH: closes a‘ stick circuit for itself. extending
from? (+.) , back contact: l31of$ rielaySGCD; front‘ winding of relay- lPC, to (—)'“.ispi'cked up over‘ a’
Signal station relay SGST
contact. 14 and" winding of? relay SGCH, to (-).
circuit‘ extending from 0+‘); front contact‘ llli
The closing of,‘ front: contact 2]‘! initiates'zthe ‘cycle of
relay‘ lPC, back contact‘ I20‘ of relay‘ INC
of: operations as‘ above noted; . '
.
and winding-‘of'relay'SGST; to rr(--‘) . Sinc'ebacki
A“ circuit is closed for picking up‘relay SGCD contact ill of relay [PC is open throughout ‘this
extending from‘ (+), back: contact l5¢of relay. cycle, relay SMST- cannot b‘e'picked up. With
SA, backzcontact. liiiof; relay ‘NC, .back-Qcontact‘ ll: relay SMST deenergized; the- circuits‘ to the‘
of relay PCrfrontn contact. 181 of‘ relay SGGH' switch ‘ machine. control ? relays ISMR" and ‘ ZSMRE
winding of relay SGCD, .to‘(—‘). The. open
maintained deen'ergized so'1that these relays
70. and
ingof backcontact‘ l8 of‘lrelayv SGCI-I‘prevents are
c‘annotbe operated-during akcycle for ‘the trans
the energizationofl anyv other; GD. relay, includ=
mission of signal controls only‘,
ing relay SMCD in the series but farth‘err‘along
' When relays 4V’and14V1 are picked up'to se
the‘ chain.‘ circuit; ‘n the; event: that another lect the circuitsvfor the fourth step, relay PC
change. relay‘. is; picked.‘ up 1 such as relay SMCH.
on a‘ single“. cycle.
6
2,126,210
is again energized over a circuit which now
extends through front contact 45 of relay 4V,
control bus ‘II, front contact 49 of relay SGCD
and. front contact 40 of relay WCK to the (+)
control bus 41. The fourth impulse in control
line I0 is therefore (+) which positions contact
H4 of relay F1 to the right, closing a circuit
which now extends through front contact H2 of
relay 4V1 and the winding of relay 2P0, to (—).
10 Relay 2PC picks up and closes an obvious stick
CL, to (—).
Relay IEG clears signal IE by
means of its contact I 44.
The picking up of back contact I45 of relay
IEG opens the series energizing circuit of relay
M, so that this relay is dropped and at its front
contact I46 (CN) potential is removed from re
lays ISMR and ZSMR so that all switch control
circuits are locked to prevent their energization
or switch movement when a signal is cleared.
The dropping of front contact I35 of relay M
opens the energizing circuit of relay TD to pre 10
lect the circuits for the ?fth impulse; a circuit vent a change in the direction selecting circuit
is closed for again energizing relay PC extending ' when a signal is cleared. The dropping of back
15 from (+), front contact M of relay C, back con
contact I 41 of relay M connects (+) to conduc
tact 43 of relay 6V, front contact 44 of relay 5V, tor I37, which provides a stick circuit for main 15
control bus 8|, front contact 59 of relay SGCD, taining the signal clear in the event that relay
contact 56 of lever SGL in its right (east) dotted CK is dropped on a subsequent cycle, for a pur
pose which will be later pointed out.
position, (+) control bus 41 and Winding of re
20
The, passage of an eastbound train over the
lay PC, to (—). At the ?eld station, contact
detector
track section in acceptance of the cleared 20
I I4 of relay F1 is actuated to the right closing
a circuit for picking up relay 3PC which extends signal IE deenergizes track relay T, which opens
front contact I48 deenergizing track repeating
from (+), front contact H8 of relay S01, con
relay ‘I? and thereby closing back contact I49.
tact I I4 of relay F1 in its right hand dotted posi
25 tion, back contact H0 of relay 6V1, front contact
The opening of front contact I25 of relay T
III of relay 5V1 and winding of relay 3PC‘, to deenergizes the stick circuit of relay CL so that 25
this relay has time to drop before the closure of
(—). Relay 3PC closes an obvious stick circuit back
contact I49 of relay ‘1?.
for itself by way of its front contact I22.
The
dropping of relay CL deenergizes conduc
When relay 6V is picked up to select the po
30
larity of the sixth impulse in line conductor I0, tor I 42 which is effective to drop relay IEG for
putting signal IE to stop. The closure of back 30
a circuit is closed for picking up relay NC ex
tending from (+), front contact 4| of relay C, contact I49 of relay TP prepares the stick cir
front contact 43 of relay 6V, control bus 9|, front cuit for relay CL, so that this clearing relay
contact 5‘! of relay SGCD, contact 58 of lever may be stuck up on a succeeding cycle if relay
35 SGL in its right dotted (proceed) position, (—)
T is down. The closure of back contact I45 of
relay
IEG again completes the energizing cir
control bus 48 and winding of relay NC, to (—).
cuit for relay M so that this relay picks up and 35
This causes line I0 to be energized with current
of (—) polarity at the sixth step so that relay places the circuits in condition for receiving and
executing subsequent controls subject of course
- F1 is positioned to the left. A circuit is closed
to approach locking and other safeguards ordi
40 for picking up relay CL extending from (+),
narily provided in a system of this type.
40
front contact H8 of relay S01, contact H4 of
Having considered the‘ manner in which code
relay F1 in its left hand dotted position, front receiving
relays IPC, 2PC and 3PC are picked up
contact I 23 of relay 6V1, front contact I24 of re
during a cycle of operations in accordance with
lay SGST and winding of relay CL, to (—'). Re
the code received and the speci?c manner in
45
lay CL closes a stick circuit for itself extending which controls result from the execution of the
from (+), front contact I25 of relay T, back signal clearing circuit for signal IE, the execu 45
contact I26 of relay SP, front contact I27 and tion of the remaining codes may be taken up in
circuit for itself by way of its front contact I 2I .
When relays 5V and 5V1 are picked up to se
winding of relay CL, to (—) .
The executing circuit at the ?eld station is
effected on the sixth step when relay FP1 picks
up and closes a circuit for picking up relay EX
extending from (+), front contact I28 of re
lay FPl, front contact I29 of relay 6V1 and wind
55 ing of relay EX, to (—). A circuit is now closed
50
for positioning direction relay TD to the right
extending from (3+), front contact I30 of re
lay EX, front contact I3I of relay 3PC, back
contact I32 of relay 3NC, front contact I33 of
60 relay SGST, conductor I34, front contact I35
dividually with the conditions established prior
to the execution impulse being merely mentioned.
Other single signal clearing cgcles.—For ex
ample, when signal lever SGL is actuated to its 50
left dotted (west) position with levers ISML and
2SML remaining in their normal positions, the
actuation of starting button SB initiates the cycle
as before. In this event signal IW at the ?eld
station is to be cleared since it is assumed that
the track switches ITS and 2TS are in their nor
mal positions.
‘
and 2TS are in their normal lock positions, the
The operation is the same as before except that
direction relay TD of Fig. 3 is positioned to the
left for selecting signal relay I WG. With con 60
tact 56 of lever SGL closed in its left dotted po
polar contacts of relays ISMR, IWP, ZSMR and
sition, the ?fth stepping relay 5V selects relay
of relay M and winding of relay TD, to (CN).
Since it is assumed that-track switches ITS
NC so that the ?fth impulse applied to line I 0
is (~) for positioning relay F1 to the left. On
the ?fth step- at the ?eld station a circuit is 65
picking up relay IEG which extends from (+), closed from (+) , front contact H8 of relay S01,
front contact I36 of relay CK, conductor‘I31, contact H4 of relay F1 in its left hand dotted
70 front contact I38 of relay IWP, polar contact
position, back contact I23 of relay 6V1, front
I39 of relay IWP in its right hand position, contact I50 of relay 5V1 and winding of relay 70
polar contact I40 of relay ISMR in its right 3NC, to (—). Relay 3N0 is picked up and stuck
up over an obvious circuit'closed by its front
hand position, winding of relay IEG, polar con
tact I 4I of relay TD in its right hand position, contact I5I.
In this case relays IPC, 2PC and 3N0 are up
conductor I42 and front contact I43 of relay
when the executing impulse is applied to relay
75
65 ZWP are in their right hand positions with the
neutral contacts of the WP relays in their en
ergized positions. A circuit is now closed for
7
EX, so that the actuationof the contacts .of re
lay EX closes a. circuit for positioning relay TD
to'the left extending from (B—), ‘front'contact
I52 of» relay EX, back contact I 53'of relay‘ 3PC,
front contact I32 of ‘relay 3NC,v front contact
I33 of relay SGST, conductor. I34, front contact
I35 of relay M and winding of relay TD, to
(CN) .' When relay Chis picked up as previous
ly described, a circuit is completed for picking
upirelay IWG which ‘extends from (+), front
contact I36 of relay CK, conductor I3l,'front
contact I38 of relay IWP, contact‘I39 of relay
IWP in its right hand position, contact I45 of
relay ISMR in its right hand.‘ position, winding
15 of relay IWG, contact‘ I4! of relay TD in its left
hand dotted position, conductor‘ I42 and front
contact I43 of relayCL, to (-~).
.
The picking up of back contact I54 of relay
‘IWG drops ‘relay M for locking as previously
20 described. The actuation of contact I55 of re
lay IWG clears signal ‘IW as indicated .by the
‘dotted line connection. The remainder of the
operation for this condition is the same as the
?rst detailed example and need notbe repeated.
For example, with switch. machine lever ISML
25
already in its left dotted (reverse) position and
leverSGL i'n‘itsl‘eft dotted position; This makes
the ?fthiimpulse in the line ‘circuit (—) which
positions relay F1 to the left for picking up relay
3N0 as previously described.
'
Y
» w
1'1‘
‘Relay. 3N0 pickedup and relay 3PC down corn
pletes the executing circuit for positioning relay
TDto'the left when relay EX is picked up to close
its front ‘contact I52, which circuit has been pre
viously described. - With relay TD' positioned to
the left, a circuit'is closed for picking upfrelay 10
IAWG ‘which extends from (+), front contact
I36 of ‘relay- CK, conductor I31, front contact I38
of relay IWP, contact I39 of relay IWP in its
left hand dotted position, contact I56 of relay
ESMR in'its‘ left hand dotted position, contact 15
I59 of relay‘ZWP in its right hand position, con
tact I50 of relay 28MB in its right hand position,
winding of relay I'AWG, contact I51 of relay TD
in its left hand dotted position, front contact
I58 ‘of'relay 2WP, conductor I42 and front ‘con; 20
tact' I43. of relay CL," to (—). ‘Contact I84 of
relay IAWG clears‘signal IAW and contact I83
locks the’ control circuits as before.
-
For example,-if-the operator desires to clear
signal IBW, signal lever SGL is operated to its .25
left (west) dotted position and assuming that
lever SGL positioned to its right (east) dotted , track switches“ ZTS and ITS are both in their
30
35
position, followed by the‘actuation of starting
reverse locked positions, and assuming that switch '
button SB, then the cycle of operations is similar
to the ?rst detailed example except in this case
track switch ITS will be in its reverse position
and relays ISMR and IWP will be actuated to
the left. In this example signal IAE is to be en
ergized to clear tra?c in an eastward direction
machine levers ISML and ZSML ‘are in their left
over track switch ITS reversed.
.
When stepping relay 5V selects contact 55 of
lever SGL the circuit is extended to relay PC
for‘applying a (+) impulse to the control line on
the ?fth step.
‘
‘-
,
,
,7
.
40 . This (+) impulse actuates relay F1 to the right
as before so that relay' 3P0 will be picked up.
Relay TD is positioned to- the right as- before
‘so that a circuit is closed for picking uprelay
IAEG which extends from (+), front contact
45 13601” relay CK, conductor I31, front contact
I38 of relayIWP, contact I39 of relay IWP in
its left hand dotted position, contact I55 of relay
ISMR. in its left hand dotted position, winding. of
relay ‘IAEG, contact I51 of relay TD in‘ its ‘right
hand position, front contact I58 of relay “2WP,,
conductor I42 and front, contact I43 ‘of relay CL,
to(—-_). Contact I82 of relay IAEG‘ clears sijgnal
‘I‘AE and contact I'I'I locks the‘ control circuits as
before.
‘
.
‘
‘
‘
‘
For example, with switch machine levers I‘SML.
and ZSML both in their left (reverse) positions
and track switches ITS and 2T8 in their reverse
. locked positions, then the actuation of lever SGL
to its right (east) dotted position is likewise ef
60 fective to clear signal IAE in the manner just
described. In this case the only difference in
the control relay positions at the ?eld station is
that relays ZSMR and ZWP‘ are in their ‘left
hand dotted positions which does not change the
above described selecting circuit for relay IAEG.
WFor ‘example, if the operator desires to clear
‘ signal IAW when track switch ZTS is normal
‘and iiTS ‘is ‘reverse, switch machine‘ lever ZSML
will be in its’ right (normalljposition and lever
70 ISML in. its left (reverse) position. The actu~
aticn of lever‘SGL to its leftifwest) vposition‘fol- ‘
lowed‘by the actuation of starting‘ button SB
‘causes the system to go through a cycle of oper
ations as before. In this event, relay 5V's‘elects
55 negative coderelay NC through contact 55 of
(reverse) positions, the system steps through a 30
cycle as before. Since contact 56 of lever SGL
is in its left dotted position‘, stepping relay 5V
selects relay NC so that the ?fth impulse applied
to the line is (—). ‘This is effective to pick up ,
relay‘ 3N0 instead‘ of relay SP0 and when execut
ing relay EX‘is picked up at the end of the cycle,
relay- TD is positioned to the left‘as previously
described. When relay CL‘is ‘picked ‘up to clear
the signal, a circuit is closed for picking up relay
IBWG which extends from (+)‘, front contact
I36 of relay CK, conductor I31‘, front contact I 38
of, relay IWP, 'contact‘I‘SSIof relay IWP in‘ its left
hand dotted position, contact I56 'of relay ISMR
in its left hand dotted position, contact I59'of
relay ZWP in its left hand dotted position, contact
‘I6! of relay ZSMR in‘its left hand dotted" posi
tion, winding of relay IBWG, contact I 51‘ of relay
45
TD in its left‘ hand dotted position,- front contact
I58 of relay 2WP, conductor I42 and front‘con
tact I43 of relay ‘CL,1to- (—) . Relay‘IBWG clears 50
signal I BW by actuating its contact I62‘ and locks
the‘ con‘trol‘c‘ircuits by‘ actuating its contact I80.
‘It will‘ be noted-‘that the picking up of any
signal clearing relay opens the series energizing
circuit" of ‘relay M for a purpose which has been I‘
already described. The passage of a train ‘over
the detector track section in acceptance of‘ a
cleared signal causes relays T and TP to be ‘se
quentially dropped, which'results in‘ the momen
tary opening ‘of the stick circuit of'relay CL so 60
that this relay is deenergized in readiness for
preparing the' next signal clearing ‘circuit.
'
‘ In: the ‘above recited‘ examples, ‘relay SGCD is
picked up when‘ front contact ‘ I8 of‘rela'y- SGCH
is closed and ‘the corresponding relay 'SGSTj at
the ?eld station is picked up‘ due to‘the fact that
thethird impulse in‘ the line is (+) ‘for picking
up relay IPC, as determined by relay SGCD-be
ing up for'selecting relay‘ P_C by"way"o'f;front
contact‘ 45 ‘ofrelay SGCDJ" Relay 2PC‘-is picked ‘To
upon the fourth ‘step because relay WCK remains
up,'so that the fourth impulse is (+) as selected ‘
through front‘ Contact‘ an of "reIayTWCK ‘and
front contact ‘49 of relay SGCDL Relay 3P0 is
picked up when the ?fth impulse is: (+)“ a'svdel
8
2,126,210
termined by signal lever contact. 56 being in its
right (east) dotted position. The combination of
relay 3PC up and relay 3NC down positions relay
TD to the right for selecting any eastbound signal
clearing relay. With relay\3NC picked up on the
?fth step, as' determined by lever SGL being in
its left (west) position, the combination of relay
3NC up and‘ relay 3190 down positions relay TD to
the left for selecting a westbound signal clearing
10
relay,
-
Since contact 58 of lever SGL is in either its
right or left dottedpositions in the above ex
amples, the sixth impulse is (—) for picking up
relay CL on the sixth .step to prepare the signal
15 clearing circuit. If the signal lever contact 58
is in its neutral position, then relay PC is se
lected on the sixth step for making the sixth im
pulse (+) which is the stop code. A (+) im
pulse on the sixth step positions relay F1 to the
20 right to close a circuit for picking up‘ stop relay
SP. This circuit extends from (+) , front contact
II 8 of relay S01, contact “4 of relay F1 in its
right hand dotted position, front contact IIO of
relay 6V1, front contact I09 of relay SGST and
25 winding of relay SP, to (—) . Relay SP opens the
stick circuit of relay CL at its back contact I26
so that relay CL is dropped to put all signals to
the line circuit is energized with a (—) impulse 10
which is effective to pick up relay 2NC over a cir
cuit extending from (+), front contact H8 of
relay S01, contact I I4 of relay F1 in its left hand
dotted position, back contacts I23 and I50 of re
lays 6V1 and 5V1 respectively, front contact of 15
relay 4V1 and winding of relay 2NC, to (—). Re
nor 2SML are moved to a new position when a
cycle is initiated to clear a signal. It will now be
assumed that the switch vmachine levers are
new position. With relays SGST and 2NC picked
up, the stick circuit of relay CK is deenergized
of lever SGL in its neutral ‘position connects to
30 the (+) control bus for the purpose of providing
an impulse in the line at the ?fth step so that
the system will take this step when the stop code
is transmitted.
Switch operation-In the above examples it is
35 assumed that neither switch machine lever ISML
moved to new positions and an explanation will
.40 be given of the operation of the system. .
In this case the system steps through two cycles
of operations, the ?rst cycle‘ being effective to
select and prepare the signal clearing circuits and
the second cycle being effective to condition the
switch machine control circuits, after which the
signal clearing, circuits are completed, provided
proper response and correspondence is established
between the various control devices at the ?eld
station.
,
~
,
For example, it will be assumed that the opera
tor moves switch machine lever ISML from the
reverse position to the normal position and that
lever SGL is in its right dotted position for clear
ing signal IE. The momentary opening of con
55 tact 32 deenergizes the stick circuit of relay WCK,
which stick circuit includes front contact 33 of
relay WCK, and this relay is dropped.
When
starting button SB is actuated, relay SGCI-I is
picked to initiate a cycle of operations as pre
60 viously described.
Since relay WCK is down, a circuit is closed for
picking up relay SMCH extending from (+) , con
tact 26 of button SB, back contact 29 of relay
WCK, front contact 34 of relay SGCH and wind
65 ing of relay SMCH, to (—) . Relay SMCH closes
a stick circuit for itself extending from (+) , back
contact 36 of relay SMCD, front contact 35 and
winding of relay SMCH, to (—). Relay C is
picked up to close its front contact 4| by means of
70 circuits which areydisclosed and described in the
above mentioned prior application. Ser. No.
640,062. The system now steps through a cycle
with the stepping relays in the control office and
at the ?eld station, illustrated in Fig. 2 operating
76
IPC as before.
Relay 4V selects relay NC‘ on the fourth step
by Way of back contact 40 of relay WCK, so that
lay ZNC closes an obvious stick circuit for itself
by way of its front contact I 64.
On the ?fth step relay PC is picked up to pro
vide a (+) impulse in the line circuit because 2.0
contact 56 of lever SGL is in its right dotted po
sition. This causes the energization of relay
3PC at the station since relay F1 is positioned
to the right.
On the sixth step, relay NC is energized to pro 25
vide a (—) impulse in the line circuit because
contact 58 of lever SGL is in a proceed position.
This picks up relay CL at the station to prepare
the signal clearing circuit as previously described.
In this instance, however, the signal clearing cir
cuit cannot be completed because relay CK is
dropped on the fourth step. This is because re
lay SGST is picked up on the third step, since
this is a signal clearing cycle and because relay
2N0 is picked up on the fourth step due to a 35
switch machine lever having been moved to a
stop by deenergizing conductor I 42. Contact 56
50
A’ circuit is closed through front contact I8 of
relay SGCH for picking up relay SGCD as pre
viously described. On the ?rst step after station
selection (third step) relay PC is picked up to en
ergize the control line with a (+) impulse. This
(+) impulse at the ?eld station picks up relay
in synchronism.
,
'
at back contacts I65 and I66 of these respective
relays. Since (+) potential is ‘removed from 40
conductor I 31 by the, dropping of contact I36
of relay CK, the signal clearing circuit is in
complete. At the end of this cycle relay EX is
actuated to close the previously described cir
cuit for positioning relay ‘I'D to the right due to 45
the fact that relay 3PC is picked up and relay
3NC remains down.
.
Relay SGCD in the control of?ce is dropped
at the end of this cycle as before. Relay SMCD
is picked up over a circuit extending from (+) ,
back contact I5 of relay SA, back contact I6 of
relay NC, back contact I‘! of relay PC, back con
tact I8 of relay SGCH, front contact 25 of relay
SMCH and winding of relay SMCD, to (—). Re
55
lay SMCD closes a stick circuit for itself through
its front contact ‘M which is similar to the pre
viously described stick circuit for relay SGCD.
Since relay SMCH is picked up, its front con
tact 28 causes the system to be initiated into a 60
second cycle of operations. On the third step of
this cycle relay NC is picked up by way of a
circuit including front contact 31 of relay SMCD
so that the line is energized with a (—) im~
pulse. At the ?eld station, relay F1 is actuated 65
to the left for picking up relay INC over a cir
cuit including front contact II9 of relay 3V1.
Relay INC closes an obvious stick circuit for it
self by way of its front contact I61.
On the fourth step relay PC is energized over 70
a circuit including front contact 38 of relay
SMCD and contact 39 of lever ISML in its. right
position. This energizes the line with a (+)
impulse so that relay 2PC at the ?eld station is
energized over a circuit including front contact 15
9
2,126,210
“I I2 ‘of. relay“ llvli‘and'lcontact I“ of relay F1 in
‘of irelay 1 WP inits right hand position‘, contact
its. right hand dottedpositionwi
1140 of ‘.‘relay ISMR" . ‘in;- its; right. - hand position,
winding ‘ of: relay % IEG, : contact ll 4 I‘ of‘ relay TD in
-' =
‘ r;
v I
On the ?fth step relay PC is energized‘lkiover
a“ circuit 1 including front contact (60- of» relay
SMGD :and contact‘ 62 ‘of =lever~2SMLin its right
its right hand:position,.conductor ‘I42 and front
contact- I43’of irelay CL; to! (—-). ' Signal. IE is
‘cleared ‘and the control circuits “are looked as
I positionr This ‘energizes the control line with
a (+) impulse so that relaySPC is picked-up
previously described.’
over a circuit including front contact ‘I II of re
lay 5V1 and contact H4 of'relay F1 in its right
hand ‘dotted position.
'
‘ 1
‘
'
' Consideration of other combinatz'mta-The de
scription above fmore speci?cally-points out the
transmission: of -:two code combinations during 10
two cycles-formoving track switch ITS from
reverse toltn‘ormal, leaving track switch‘ ZTS in
its normal position and clearing signal ‘IE, Any
'
0n the sixth‘step a circuit-is closed for picking
up relay NC by way of front ‘contact 63 of relay
SMCD. Thegpolarity of this impulse is ineffec
'tive 'at the field station because the circuit
llb through contact H4 ‘of relay‘Fl in its left hand
one of the other signals‘ maybe similarly cleared
‘dotted position andvfront contact l23-of relay
codelcombinations‘as applied to the linecircuit
6V? is open at ‘contact I24 of‘ relay SGST, which
is deenergized‘as ‘will be presently‘ explained.
in‘lthe control o?ice by the corresponding com
binationsf set up by the switch machine and
This sixth (-'~) impulse therefore serves no other
signal levers.
purpose than ‘to energize the control line sothat
the apparatus in the vcontrol office and at ‘the
?eld station may take the ‘sixth step.‘ ‘Since re-‘
For example, assuming that lever ISML is 20
movedfrom-its left (re-verse) ‘to its right (normal) ,
position,‘ lever ZSML» is left in‘ its normal posi
in ~ response» tothe transmission of the proper 15
'
'
tion and lever SGL positioned‘ inits left ‘dotted
" lay IPC is down and relay INC’ is up‘ during this
cycle, relaySGST'is deenergized; Relay SMS‘Tji‘s
(west) position, then signal 'IW will‘ be cleared
energized ‘overv- ' a circuit - extending ' from; (+) ,
‘for a train to-advanceover the main- track'in a 25
westbound‘ direction. In . other words, track
switch .I'I‘S willbe moved toits normal position,
front contact IZIIofreIay-lNQ'backcontact II‘!
of ‘relay IPO and Winding of relay SMST, to
(-—).
~
>
r
track switchZTSwill remain in its ‘normal posi
tion and signal IWH will‘ be cleared. Duringthe
operation of ‘the ?rst cycle under this condition,
code receiving relays IPC, 2N0 and _3NC will be
‘
' ‘> ReIayLEX‘ is picked up at the end of‘ this sec
ond‘ cycle-and ‘a circuit ‘is 7closed for picking -_up
‘relay CKwhich extends from ~~(+)>," front con
tact‘ I68 -of relay‘EX; front-contact 169 of relay
SMSTandwinding of relayCK; to (-). Relay
CKestablishes a- stick‘ circuit-for itselfleextend
picked up on-‘steps 3; 4 and 5 respectively. ‘ This is
determined in the control aol?ce by relay PC
being selected-ion the third step? through front
contactlll? of relay~SGCD,> relay NC‘ beingi se-‘
lect'ed‘on‘ the fourth, step through front contact
ing-‘from-I (+)',aback contact ‘1650f relay SGST,
front-contact \ I'm-and winding of relay OK; to
»(—).
I,
‘
r
“of »relay-SGCD,-and' backicontact 40-of relay
‘
WCK‘ and relay NC“ being selected on‘ the?‘fth
Recalling‘that relayCL was picked'up at *the
enctof the ?rst cycle‘ andlsincerelay CK-is picked
up at the end of thetsecond lcycle, conductors
I31 and l42ware bothienergized so rthatlsignal
step through front contact 59 of relay‘ SGCD and
contact 56~of lever SGL in-Iits left ‘position.
'
~
\
-
4
‘
'
up‘ until =the~track section becomes occupied or
until a stopusignal is transmitted. ‘This is brought
about by relay 6V in‘ the control of?ce‘ selecting 45
relay NC through front contact 51 ‘of relay SGCD
'
Theipicking up of relay EX closes a circuit for
positioning relay ISMRto its right hand position
whichllextends from -(B+)’,' front \contact I3llof
relay
front contactJ'IB of=relay~ 2PC§ back
and contact 58 of lever-SGL in its proceed posi-‘
tion; Relay‘TD at the ?eld/station is positioned
to the left as previously explained,‘ since the
circuit extends ‘to (B—) ‘ at ‘front contact I527 of 50
contact 112 of relay.-‘2NC,"frontncontact I13 ‘of
relay 2 SMST; conductor “114,-; winding of - relay
relay‘EX'by‘ way ofba‘ck ‘contactv I53 of relay
3P0, front contact I32 of relay 3N0 and front
contact‘ I33 ioflrelay ‘SGST; Relay SGS'I‘v is
picked up during the! ?rst‘ cycle; because relay
IPC is up.. This operation .hascbeen ‘previously 55
ISMR and. front contact. I461of relay M; to
.(CN).
Since relay .3PC.
'
is
. picked- ‘up
v andsince relay
‘3NC :is‘ down, a circu‘it‘is also closed for ener
gizing relay 28MB ‘extending from (B+-); front
contact .I30rof_.relay EX, front contact I3l‘of1re
lay 3PC, back contact» I32 of, relay‘3NC, front
described;
3P'C will. be picked ‘up at the ?eld station as .de
ZSMLwas already in its right (normal) position,
relayl ZSMR. is in its vright hand position» at this
front contact :60. of relay i_SMCD ' and contact - 62
timeso that the-energi‘zation of its windingridoes
contacts.‘ 1
~
~
" --
‘
‘
of lever ZSML in its right position on ithe‘r?fth
‘
Relay I SMRI closesa‘circuit (notshown) *‘for
energizingxthev switch. machine motor‘ over~its
normal operating circuitaand when relay-1W13
responds by‘positioning its polar contact I39zto
'
terminedby the-selecting circuits through front
contact 31- of ‘relayfSMGD‘onthe third step,'front 60
‘contactl38 of relay SMCD and contact 39 of‘lever
ISML in, its‘ right. position on thelfourth step and
ing of relay ZSMR and front ~contact-I46-cf- re
lay M, Eto (CN) .: Since it was 'assumedthat lever
shift its
'
. During thesecond'zcycle relays INC, 2P6 and
contactill5 of relay SMST, conductor 116; Wind
not
step.
>
I’
Relay. INC’ up
r
.
I
F
‘
and relay- IPC‘ down drops ‘relay
SGST'and'picks up relay SMST ‘to mark this
as avsecond.--.cycle."' Atl‘the end of the‘ second
cycle .the ‘ previously I described ‘ executing circuit
- the right andbyrpickingoup its».neutral contact
picks uprelay'EX-and closes a‘circuit from (‘B-F).
‘I38 as an indication that trackmswitch‘ .ITS is in
at vfront contact ' I30 = 1of. relay EX,- Ifront ‘contact
its normal; locked positioni.‘ the. circuit gforrelay
.lEGiis completedw This, circuit extends from
1(+9,qfrontlcontact 136 ‘of ‘relay CK,‘ conductor.
I,.3'I_,_,front ‘contact; :I 38 got .renmwra. contact I 39
40
is-‘pickedqup‘ as previously ‘described'land-stuck
lIAE maywbe‘cleared as soon! as the switch ma
‘
‘
“ ‘On the sixth step‘ relay “CL at the ?eld‘ station
chine : control and repeating - relays are » in‘ proper
correspondences
35
ll-l9-‘offrelay 2P0; ‘back contact 1N2 of relay. ZNC,
front contact I'ISJQfIeIayISMST, conductor. I14,
winding of, relay ISMR and-frontconta‘ct-lll? of
relay lvL'to .(CNT). ‘This positions relay ISMR
65
10
2,126,210
to the right for positioning track switchITS to
normal. Since relay 2SMR isjassumedl to be
already in its normal position, track switch_>2TS
will be in a corresponding position; *
'
Of course, it will be understood that relay CK
was dropped during the ?rst cycle and picked
up at the end of the second cycle, so that the
signal vclearing circuit is .not completed until
the end of the second cycle. This circuit extends
10 from (+), front contact I36 of relay CK, con
ductor I31, front contact I38 of relay IWP, con
tact I39 of relay IWP in its right hand position,
contact I40 of relay ISMR in its right hand posi
tion, winding of relay IWG, contact I4I of relay
-1 5 TD in its left hand position, conductor I42 and
front contact I43 of relay CL, to (—~). Relay
I WG is picked up to clear signal IW and to-drop
relay M which looks the switch machine control
circuits as before.
20
For example, assuming that lever ISML is
moved from its, normal to its reverse position,
that lever ZSML stays in its normal position and
lever SGL is actuated to its right (east) dotted
position, relays IPC, 2NC, 3PC and CL will be
picked up on steps 3, 4,, 5 and?respectively. This
combination of relays is determined by relay
SGCD being up on the, third step, relay WCK
being down on the fourth step, lever SGL being
in its right dotted position on the ?fth step and
30 contact 58 being in its actuated (proceed) posi
tion on the sixth, step.
Relay IPC up and. relay INC down selects and
operates relay SGST. Relay 2NC picked up with
relay SGST picked up drops relay CK. Relay 3PC‘
up and relay 3NC down completes a circuit from
(B+), through front contact I30 of relay EX,
front contact I3I of relay 3PC and back contact
I32 of relay 3NC for actuating relay TD to the
right.
.
,
v
j
During the second cycle relays INC, 2NC and
3PC will be pickedup on steps 3, 4 and 5 _re
spectively as determined by relay 3V inYthe con
trol o?ice selecting relay NC through front con
tact 31 of relay SMCD, relay 4V selecting relay
45 NC through contact 39 of lever ISML in its left
dotted position and relay 5V selecting relay PC
through contact 62 of lever 2SML in its right
position. When relay EX is picked up to execute
this combination, relay ISMR-is actuated to its
50 left‘ hand position because the circuit from'(B-—)
at front contact I52 of relay EX is established
by way of back contact I1I of relay 2PC, front
contact I12 of relay‘ 2NC and front contact I 13
of relay SMST.‘ Relay 2SMR is energized with
(B+), since the circuit through front contact
I30 of relay EX is extended through front con-.
tact I3I of relay 3P0, back contact I32 of relay
3NC and front contact I15 of relay SMST. The
signal clearing circuit is established for clearing
60 signal IAE by picking up relay IAEG over a
circuit including contact I51 of, relay TD in its
right hand position, contacts I56 and I39 of re
lays ISMR and IWP in their left hand dotted
40
positions.
‘
,
c
-,
For example, assuming lever ISML moved from
its normal to its-reverse position with lever 2SML
remaining in its normal position and lever SGL
actuated to its left (west) position, then relays
IPC, 2NC, 3NC and CL at the ?eld station will be
picked up during the third, fourth, ?fth and sixth
steps respectively. This is because the third step
in the control of?ce selects relay PC through front
contact 46 of relay SGCD, the. fourthstep selects
relay NCbecause contact 40 of relay WCK is
75 dropped, relay 5V selects relay NC because lever
65
SGL is in its left (west) . position and relay 6V
selects relay NC because lever SGL is in a proceed
position;
,
>
Relay IPC up and relay INC down picks up
relay SGST to mark this as the ?rst cycle for
preparing the signal clearing circuits. Relay 2N0
picked up with relay SGST up drops relay CK
toprevent clearing a signal until another cycle
is transmitted. Relay 3NC up and relay 3P0
down positions relay TD to the left (west) over 10
the previously described circuit including front
contact I52 ofrelay EX.
The system now advances through its second
cycle when relays INC, 2NC and 3PC‘ are picked
up. This is because relay NC in the control office 15
is selected on steps 3 and 4 through front con
tacts 31 of relay SMCD and front contacts 38 of
relay SMCD and 39 of lever ISML in its left
dotted position respectively. Relay PC is selected
on the ?fth step through contact 62 of lever 20
ZSML in its right position.
Relay SGST is
dropped and relay SMST is picked up (at the ?eld
station) at the start of'the second cycle as pre
viously described and when execution is effected
at the end of the second cycle, relay ISMR is posi 25
tioned to the left over a circuit extending from
(B—), front contact I52 of relay EX, back con
tact I1I of relay 2PC, front contact I12‘ of relay
2N0, front contact I13 of relay SMST and over
the remainder of the previously described circuit. 30
Relay ZSMR is energized with current of the
proper polarity for maintaining this relay in its
right hand position over a circuit extending from
(3+) , front contact I30 of relay EX, front con
tact I3I of relay 3PC, back contact I32 of relay 35
3NC.and_ front contact I15 of relay SMST over
the remainder of the previously described circuit.
Since relay TD is positioned to the left a circuit
is completed for picking up relay IAWG extend
ing from (+), front contact I36 of relay CK, 40
conductor I31, front contact I38 of relay IWP,
contact I39 of relay IWP in its left hand dotted
position, contact I56 of relay ISMR in its left
hand dotted position, contact I59 of relay 2WP
in its right hand position, contact I60 of relay 45
ZSMR in its right hand position, winding of relay
IAWG, contact I51 of relay TD in its left hand
dottedv position, front contact I58 of relay 2WP,
conductor I42 and front contact I43 of relay CL,
to (—). Relay IAWG clears signal IAW and 50
locks the control circuits as previously described.
For example, assuming lever ISML moved from
its normal to its reverse position with lever ZSML
in its reverse position, then relays IPC and ZNC
are picked up on the third and fourth steps of the 55
?rst cycle for reasons previously explained. Like
wise, relay SGST at the station is picked up and
assuming lever SGL in its right dotted position,
relay PC is picked up on the ?fth step which
makes the ?fth impulse in the line (-i-) for 60
picking up relay 3P0.‘ In the event that lever
SGL is in its left position, then relay NC is picked
up for making the ?fth impulse in the line cir
cuit - (—) which picks up relay 3NC.
With relay 3PC up and relay 3NC down (lever 65
SGL in'its east position), the execution circuit
closed at the end of the ?rst cycle extends from
(B+) through front contact I30 of relay EX,
over the previously described circuit to relay TD 70
for positioning-this relay to the right. With relay
3NC up and relay 3PC down (lever SGL in its
west position), then the executing circuit for
relay ‘I'D at the end of the ?rst cycle extends
from (B—) through front contact I 52 of relay 75
2:1
"2,1263 I0
EX‘over the previously described circuit .to relay
' During the second cycle under these two condi
tions, relays INC, 2‘NC‘ and ,3NC are pickedfup
as determined by relay SMCD having its front
contact 31 closed, lever ISML having its contact
39 closed in the ‘left dotted’ position‘and lever
2SML having its contact 52 closed in its left
dotted position. At the end of the second cycle
10 the executing circuit is effective to positionlrelay
ISMR to the left (reverse) because the circuit is
completed to (B—) at front contact I52 of relay
EX by way of back contact H! of relay 2PC,
front contact I12 of relay 2N0v and front contact
-15 ‘ I13 of relay SMST. (B-) is also applied to relay
2SMR from front contact I52 of relay EX by
‘Way of back contact, I53 of relay 3P0, front con
tact I32 of relay 3NC and front contact I15 of
relay
SMST.
.
'
»
'
The signal clearing circuits with the switch ma
chine control and repeating relays in their reverse
‘for the checking‘ and clearing‘of routes over a
plurality of railway track switches at a ‘single
station together-withthe putting'to stop ‘of any
r‘ofmthese routes by means of combinations of
route control codes transmitted over ‘a selective
“type communication system;
‘
‘ fTwo neutral code receiving relays are provided
‘at a ‘?eld station for each control step with all
‘of these code receiving relays assuming normally
deenergized positions.
One or the other of the
‘code receiving relays for the corresponding step
‘must receive its impulse in order for a code to be
-? transferred from the code receiving relays to the ,
lfunction control relays at the end of an operat
ing cycle.
-
I It will be apparent from the drawings and de
scription that if for ‘some reason neither code re
ceiving relay for a particular step is picked up or
if both are picked up the executing impulse at
the end of the cycle will be‘ineffective to energize i120
either station relay to position the traffic direction
‘control relay or to position the switch machine
positions is established through relays IAEG or
IBWG as determined bythe position of polar
‘contact I51 of relay TD. Relay ‘IAEG will be
325 picked up to clear signal IAE if contact I51 of
control relays depending upon the step at which
‘such false operation might happen. In. vother
relay TB is in its right hand position (east) , over
a circuit extending from (B-l-j) , front contact. I36
properv energization of ‘the ‘code receiving relays
of relay CK, conductor I31, frontfcontact I38 of
relay IWP, contact I39 of relay» IWP in its left
hand dotted position, contact I56 of relay‘ISMR
in its left hand dotted position, winding of relay
IAEG, contact I51 of relay TD in its right hand
' position, front contact ‘I53 of relay 2WP, conduc
tor I42 and front contact M3 of relay CL, to .(—).
The circuit for relay IBWG which clears ‘signal
335
IBW extends from (B-|-), front contact I36 of
relay CK, conductor I31, front contact I38 of
relay IWP, contact I39 of relay IWP in its left
hand dotted position, contact, I56 of relayISMR
14o in its left hand dotted position, contact I59 of
relay 2‘WP in its left hand dotted position, con
tact I6I of;relay ZSMR in its left ‘hand dotted
position, winding of relay IBWG, contact I51 of
relay
in its left‘ hand dotted position and
over the remainder of the previously. described
circuit, to (-).
g
In the above examples describing the operation
when a switch machine lever is moved to a new
position, it has been explained that relay WCK is
dropped when its stick circuit is momentarily
'50
opened by contact 32 or 12 of lever ISML‘or
ZSML. At the end of a second cycle, relay WCK
is picked up when relay SA is dropped-and before
relay 2SA drops over a circuit extending from
(+), back contact 230i relay SA, front contact
64 of relay ZSA, front contact 65 of relay SMCD
and winding of relay WCK, to (—) . Relay WCK
is then stuck up until the next actuation of a
switch machine lever.
\
~
It has also been explained how “the code receiv
ing relays IPC, 2PC, 3P0, INC, ZNC and 3N0‘ are
picked up in various combinations and are stuck
up. It will be understood that the stick circuit
of these relays is deenergized at the end of each
cycle when relays 6V1 and SA1 are down, opening
65
their front contacts I03 and H3 respectively.
It will be obvious that thestop code (that is,
(+) on the‘sixth step) is effective when. a switch
machine lever has been moved to, a new position
because (+) on the sixth.‘ step of the ?rstpycle
~70 picks up relay SP whichlprevents relayCL being
up ‘to clear any ‘signal in,..the second cycle.‘ ‘ _,
‘
.
summer
‘The system lofll-the present ‘invention provides
words,>the control‘circuits are dependent upon the F25
isothatan open‘ or a‘short circuit preventing the
response of either or resulting‘ in the response
of both does not cause improper‘ control opera
tion.
V
>
1'
"
iiii)
"
This means that a surge in the line which ‘may
effect the picking up of a PC relay (see Fig. 2) v
at a particular step when the code impulse picks
up the corresponding NC relay of that'step and
Vice versa, or the loss of an impulse resulting‘ in E35
the vfailure to pick up either a PC or an NC relay
at a particular step, results in the failure'to
complete the executing circuit for changing a
existing switch position" or signal condition.
'
For example, if relays IPC and ‘INC should
both (or neither) be picked up, neither relay ‘CL
nor relay SP can be energized to‘ clear ajsignal
or put an existing cleared signal to stop, because
relay SGST' cannot be energized under this con
dition. Since relay SMST cannot be picked‘up,
neither switch control relay ISMR ‘nor ESMR
can be energized.
1145
,
For example, if relays 2PC and 2NC should
both (or neither) be picked up, the executing
circuit extending through contact I52 of re1ay=1‘
EX is left open either at contact I1I of'relay
2P0 or contact I12 of relay~2NC. Likewise thev
executing circuit extending through contact I30
‘of'relay EX‘ is left open either at contact1 I19
of relay 2PC or contact I12 of vreIay‘Z’NC.
-
‘
<
For example, if ‘relays 3P0 and ‘3N0 should
both, (or neither) be picked up, the'executing
circuit extending‘ through contact I52 of relay
EX is left open either at contact I53 of relay
3P6‘ or contact I32 of relay 3N0. Likewise, the
executing “circuit extending through contact I30
Yet '
a
‘of relay EX is leftopen either at contactI3I of
relay 3P0 or. contact ‘I32'of relay3NC.
Also, the circuits are so ‘arranged that ‘the
switch control relays may not be operated to new “
positions while a signalis clear as‘governedi‘by
the series circuit of relay M-controlled by the
signal
clearing
relays.
,
a
i
Y
Another feature of the present invention resides
in the manner in which signals may vbe cleared
during‘ a single operating cycle of the communi
cation system by transmitting ‘a code combina
tion of one class,~as' determined by the condition
that no switch {machine ‘control lever in the‘ office
is moved to a new position. Two operating cycles
12
2,126,210
are requiredto clear a signal. when a code‘ com
bination of a second class is transmitted, as
determined by the condition that a switch ma
_ chine control lever in the oi?ce is moved to a
new position.
Another feature of the present invention resides
in the manner inwhich the signal clearing cir
cuits are prepared but not completed during the
?rst cycle when the communication system ad
10 vances through two cycles of operation as a
result of a switch machine lever being moved to
a new position. In this event, the switch control
circuits are completed during the second cycle
and at the end of this cycle the proper signal
.15 is cleared subject to proper response and corre
spondence of the control circuits of both cycles.
Having thus described a centralized tra?ic con
trolling system as one speci?c embodiment of the
present invention, it is desired to be understood
.20 that the present form is selected to facilitate in
the _disclosure rather'than to limit the scope of
the invention and it is to be further understood
that various modi?cations, adaptations and al
terations may be made in the present disclosure
2.5 to meet the requirements of practice without in
with its control means, a switch lever and a sig
nal lever in the control office, a code communi
cation system for transmitting signal control 10
and switch control codes on di?erent operating
cycles in accordance with the position of said
signal lever and switch lever respectively, means
operating upon movement of said switch lever to
a different position for modifying the signal con
trol code, and means at the ?eld location rendered
effective by the transmission of a signal control
code so modi?ed for opening the signal clearing
circuits for all of said signals until a switch con
trol code is subsequently received to actuate the r20
switch control means.
5. In a centralized traffic control system of the
character described for controlling the Operation
of a plurality of track switches and signals gov
erning train movement over said switches. com "25
any manner departing from the spirit or scope
prising, a plurality of manually operable switch
of the present invention except as limited by the
levers in a control o?ice one for each of said
appended claims.
switches, a signal control lever in the control
o?ice, a communication system of the code type
What I claim is:
30
character described, the combination with a
power-operated track switch and signals at a ?eld
location for governing train movement over said
switch in its different positions, of switch control
means at the ?eld location for governing said
switch, a clearing circuit for each signal closed
only if said switch is in a position corresponding
'
.
1. In a centralized traf?c controlling system,
for transmitting on different cycles switch con- 2
control oilice, a ?eld station, a control level in
trol and signal control codes in accordance with
said office, a signal at said station, a line circuit
connecting said o?ice with said station, a clear
ing relay and a checking relay at said station,
the positions of said switch control and signal
control levers respectively, means responsive to
35 means controlled over said line circuit for mo
mentarily closing pick-up circuits for said relays,
a stick circuit for said clearing relay controlled
by track conditions at said station, a stick cir~
cult for said checking relay - controlled by a
40 change in the position of said lever, means jointly
the movement of any one of said switch levers to
a different position for changing one code ele- :
ment of the signal control code to a particular
character, a stick relay at the ?eld location which
mustbe energized to permit clearing of any of
said signals, means in the ?eld for momentarily
opening the stick circuit of said stick relay upon
controlled by said relays for clearing said signal
subject to traflic conditions, and means. for there
element thereof changed to said character, and
after maintaining said signal clear irrespective of
means responsive to the reception of a switch con
the condition of said checking relay,
7
2.
In
combination,
a
track
switch
and
a
plu
45
rality of signals for governing tra?ic over said
track switch, a line circuit having a plurality of
series of code impulses of different classes trans
mitted thereover for controlling said track switch
and said signals, code receiving relays each re
50
sponsive to an impulse of said series for receiv
ing and storing said series of impulses, means
effective after the reception of a series of im
pulses of a ?rst class for clearing one of said
v55 signals, means responsive'to the reception of a
series of impulses of a second class for clearing
one of said signals‘only after the reception of a
series of impulses of a third class, and means re
sponsive to a series of impulses of a third class
60 for controlling said track switch.
3. In a normally at rest'code type selector sys
tem, a plurality of switch control levers, a signal
control lever, a starting button, means initiating
the communication system into a single cycle of
65 operation to transmit a signal control code in
accordance with the position of said signal con
trol lever upon the momentary actuation of said
button provided all of said switch control levers
have not been moved, and means initiating the
70 communication system into a plurality of cycles
of operation for transmission of both switch and
signal control codes upon momentary actuation
of said button if one of said switch control ma
chines has been moved to a new position.
11.5 4. In a centralized traffic control system of the
reception of a signal clearing code having one
trol code for closing a pick-up circuit for said
stick relay.
45
6. A centralized tra?‘lc control system for gov
erning from a distant control o?ice by a code
transmission system, the position of a plurality
of track switches and signals governing train
movement over said switches comprising, manu -50
ally operable switch control levers one for each
switch located in the control of?ce, a signal con
trol lever in the control o?ice, a communication
system of the code type for transmitting dur
ing one operating cycle a switch control code
in accordance with the existing position of said
switch levers and during another cycle a signal
control code dependent upon the position of said
signal lever, means responsive to the movement
of any one of said switch levers to a di?erent posi
tion for modifying in a certain respect the signal
clearing code, and means at the ?eld location
rendered effective by the reception of a signal
clearing code modi?ed in said respect for pre
venting clearing of a signal until a switch control 65
code is subsequently received.
7. In a centralized traffic control system of the
character described for controlling a track switch
and signals governing train movement over said
switch in its di?’erent positions, a switch lever,
a signal lever, a normally at rest communication
system of the code type for governing operation
of said switch during one operating cycle in ac
cordance with the position of said switch lever
and for governing the clearing of said signals 75
2,126,210:
13
during another cycle in accordance‘with the-posiel of?ce for‘ causing said communication system to
tion of said signalilever, means in ‘the control‘ transmit a signal clearing code with said'signal
o?ice for modifying the signal control code trans!» lever in a clear position and said switch lever in
mitted whenever: said‘switch lever is moved to, a,
-_ diiferent. position, means at ‘the ?eld. location
rendered effective by the transmission.‘ of a signal
control code of said modi?edcharacter for pre
venting clearing of a signal until a newrswitch
control code is subsequently received,‘ and
19k manually controlled means in the‘ control o?ice
for initiating said communication and causing it
to transmit a modi?ed signal control code dur-l
ing one operating cycle and a switch control code
during a subsequent operating cycle.
I
~
8. In a system of the character described,v a
plurality of power-operated track switches‘ and
signals governing train movement over said
switches to be controlled from a distant control
o?lce, switch control means‘for each’ switch, a
201i communication system of the code type operable
during a switch control cycle to govern said
switch control means for all of said switches,
clearing circuits for said signals, said clearing
circuit for a given signal being closed only if all
of said switches and their respective switch con
trol means are in corresponding positions to pro
vide a route for train movement governed by
such signal, and means at the ?eld location con
trollable from the control of?ce over said com
munication system for opening and maintaining
open said clearing circuits for all of said signals
until all of said switches are subsequently con
trolled during a switch control cycle.
9. In a centralized tra?lc controlling system for
35 railroads; a ?eld station having a track switch
and signals for governing tra?ic thereover; a
control of?ce having a manually operable switch
control lever and a manually operable signal con
trol lever; a communication system of the
40
multiple impulse code type for transmitting dur
ing one cycle of operation a signal control code
in accordance with the position of said signal
control lever and the changed condition of said
switch control lever, and for transmitting during
45 another cycle of operation a switch control code
in accordance with the position of said switch
control lever; a clearing relay and a checking
relay at said station; a stick circuit for said clear
ing relay controlled by track conditions at said
50 station; a pick-up circuit for said clearing relay
closed upon the reception of a signal control code
transmitted with said signal lever in a clearing
position; a stick circuit for said checking relay
opened upon the reception of a signal control
55 code transmitted following a change in position
of said switch control lever before the trans
mission of a switch control code; a pick-up cir
cuit for energizing said checking relay upon the
reception of a switch control code; circuit means
60 for clearing the said signal only when said clear
ing relay and said checking relay are both ener
gized; and circuit means rendered effective once
a signal is cleared for maintaining such signal
in a clear condition dependent upon the ener
gized condition of said clearing relay but inde
pendently of thecondition of said checking relay.
10. In a centralized tra?ic controlling system
for railroads; a ?eld station having a track switch
and signals for governing tra?ic thereover; a
70 control oi?ce having a manually operable switch
control lever and a manually operable signal con
trol lever; a communication system of the
multiple impulse code type for transmitting dif
ierent control codes from the control o?ice to
75 the ?eld station; circuit means in the control
an unchanged position since the last transmis
sion of a switch control code, said means caus
ing said communication system to transmit a
modi?ed signal clearing code if said switch con
trol lever has been changed in its position since
the last transmission of a switch ‘control code;
circuit means in the control office for causing 101
saidcommunication system to transmit a switch
control code in accordance with the normal or
reverse position oi? said switch control lever fol
lowing the transmission of every modi?ed signal
clearing code transmitted; code receiving means
at said station responsive to the reception of a
signal clearing code for immediately clearing said
signal and responsive to a modi?ed signal clear
ing Code for clearing said signal only after the
reception of a switch control code at said station; 20,
and code receiving means at said ?eld station
responsive to a switch control code for operating
said track switch to a position determined by
the position of said switch control lever; where
by the reliability of the code type communication
system is checked so as to allow the clearing of
a signal after a switchlever movement only pro
vided a switch control code is received at the ?eld
2,5 -
station.
11. In a centralized trai?c controlling system
for railroads; a plurality of track switches at a
?eld station; a control oi?ce having a plurality
of manually operable switch control levers one
for each of said track switches; a communication
system of the multiple impulse code type for
transmitting different codes from the control of—
?ce to the ?eld station on di?erent cycles of op
eration; circuit means for causing said communi
cation system to transmit a particular code on
one cycle of operation if any one or several of 40
said switch control levers has been operated to
diiferent positions; other circuit means causing
said communication system to transmit on an
other cycle of operation a switch control code
characteristic of the positions of said switch con 45
trol levers, said another cycle of operation follow
ing said one cycle of operation; code receiving
means at said ?eld station responsive to said par
ticular code; other code receiving means at said
?eld station responsive to said switch control 50
code for controlling said track switches to posi
tions corresponding to their respective switch
control levers; signals at said station for govern
ing tra?ic over said track switches; and circuits
for at times clearing said signals, said circuits 55
being closed only after both said code receiving
means have responded to their respective codes.
12. In a centralized tra?ic controlling system
of the character described; a ?eld station hav
ing a track switch and signals for governing 60
tra?ic over such track switch in its di?erent po
sitions; a control o?'ice having a manually oper
able switch control lever operable to normal
and reverse positions and a manually operable
signal control lever operable to clear or stop 65
positions; a. communication system of the multi
ple impulse code type connecting said control
oflice and said ?eld station for transmitting dif
ierent codes; signal‘ circuit means at the control
o?ice for causing said communication system to 70
transmit a signal clearing or signal stop con
trol code on one operating cycle of said communi
cation system depending upon the position of
said signal control lever; switch circuit means
effective to cause said communication system to
75
14
2,126,210"
transmit a normal or reverse switch control code
on another cycle of operation of said communica
tion system in accordance with the normal or re
verse posit-ion of said switch control lever; means
including a stick relay e?ective to modify a sig
nal control code irrespective of whether it is a
clearing or stop code; a’ normally closed stick
circuit for said stick relay momentarily opened
upon each movement of said switch control lever
10 ' to a di?erent position; a pick-up circuit for said
stick relay closed momentarily upon the trans
mission of each switch control code; means at
the ?eld station responsive to the reception of a
signal clearing or stop control code for clearing
15 said signal or causing it to go to stop, said means
acting in response to a modi?ed signal clearing
code to clear said signal only after the reception
of a switch control code at said station, and
means at said station responsive to a normal or
20 reverse switch control code for operating said
track switch to a corresponding normal or re
verse position.
13. In a centralized tra?ic controlling system
for railroads; a ?eld station having a track switch
25 and signals for governing tra?ic thereover with
an associated detector track section; a control
o?ice having a manually operable switch control
station, said system being of the code type for
transmitting switch and signal control codes
on separate cycles of operation; circuit means
for causing said communication system to trans
mit a switch control code in accordance with the
position of said switch control lever on one cycle
of operation and to cause the transmission of a
signal control code in accordance with said sig
nal lever on another cycle of operation, said
means being effective to modify said signal clear 10
ing code if said switch control lever is moved
to a new position subsequent to the last trans
mission of a switch control code; a signal clear
ing relay and a checking relay at said station;
a pick-up circuit for said signal clearing relay 15
closed upon the reception of a signal clearing
code irrespective of whether such signal clear
ing code has been modi?ed or not; a stick cir
cuit for said signal clearing relay closed de
pendent upon the condition of occupancy of said 20'
detector track section so as to be opened upon
the entrance of a train into such detector track
section; a pick-up circuit for said checking relay
closed upon the reception of each switch control
code; a normally closed stick circuit for said 25'
checking relay momentarily opened upon the re
ception of a modi?ed signal control code; and
lever having normal and reverse positions and a
circuit means including front contacts of said
manually operable signal control lever having
signal clearing relay and said checking relay for
30
clearing said signal.
clear and stop positions; a communication sys
tem connecting said control o?ice and said ?eld
NEIL D. PRESTON.
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