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Патент USA US2404303

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July 16, 1946.
Jfc. LAW
~ 2,404,303
Filed June lO, 1944
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July 16, 1946.
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BY @@Lloça
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Patented July 16, 4194e
John Carl Law, Topeka, Kans., asfsfigìioruto rThe
Uilio‘n -Switch and Signal Company, 'Swis'svala
Tal, ‘afcorporation of Pennsylvania 4
Application `June 410, 1944, Serial No. 339,619
-15 Claims.
My invention relates to railway ti’ai’lic control
ling apparatus, and more particularly 4to acen
tralized tr’ailic control system for governing train
movements over a single track railway.
(ol. 24e-»3)
My invention contemplates the provision 'of
power operated track switches at various lojca
tions to give access to suitably fsp'aced passing
sidings, lt'oget‘l’ler‘ with an absolutey permissive
.block system having 'automatic signals at spaced
locations in the single trackv stretches, and with
lmanually controllable head block signals at the
ling the direction of 'energizatio'n of the ’y _ ,A
sponding portion of the line circuit- Vsyst `rn.
Whereas in the Y` ’ung system directional control
is provided only 'for the single track blocks, in
the system of my invention itis e’xteiided to ln'
clude all main "track, The communicationfsy‘sï
'teni includes the usual code starting push bute
tons yflor 'initiating -code transmission, one :for
'each station corresponding to a -power switch lo;
vthe in
power switch locations, `fò-r governing traflic
movements in both 'directions YThe signals> are
governed 'automatically in accordance with ltrai‘iic
buttons for the lstations ‘at 'the 'opposit‘eexids yof
the block, depending upon the direction to be
conditions over a manually 'reversible line ‘circuit
one object y'ofm‘y invention is' the provisit
system employingbut 'two line wires and c'on‘- .
improved circuits rfor electrically interlocking 4a
remotely controlled 'power 'operatedtiaokswiten
trolled bythe track relays ‘of various track se'cà
tions, continuous track circuits being provided for
all main track, and _also 'for the passing tracks.
The 'System of my "invention is provided with a
suitable communication system,l preferably of the
impulse code type, having a station codingu'nit
at each of a plurality `of stations each of which
’and th’e signals. which govern trailic movements
over the switch, which includes, means Kfor pre?
ventingthe incorrect routing of a train ' ’the
result of the transmission "of codes for A"per
'the track switch and for clearing a signal when
the switch assumes a new position, which islet-j
comprises a power switch location. Each such
fective in> the` event -the switch is electricallir
coding unit provides means 'for manually con' 25 locked
and thereby lprevented from responding
trolling the track switch and the adjacent head
block signals, for both directions, vfrom a central
y vAnother 'object of i,my invention
` Y
is 'f
the prtg’v
y ,
` l `
point such vas a train 'dispatcher’s olïic'e, and for
of improved arrangements for the control of è' t ,cjA
controlling the reversible line circuit system to
set up the ‘desired vdirectitwl for 'traiîic movements
in the adjoining blocks. The communication
system ‘serves alsoto indicate the condition of the
track switches 'and headblock signals "at the con:
trol oí'lice, and further, toindicate the presence
of al trainat any point in the controlled territory
switches giving access to the main track yvl'lliic'lh
are intended primarily for operation by the ws
by the lighting of suitable lamps 'on a track dia
gram at the office, the diagramcontaining a lamp
cuits for controlling such electric locks, includi ’
time control means controlled lby ‘an approac iig d
states, serial i o, 501,254, olea seotoiiiloe're, 1943,
oy’tlenry s. Young, for Railway traino oontr‘ol
tion of trallio to'be set up in its block, by' control:
ated by a hand throw mechanism having its opä
a magnet My invention includes improved _ci`4rl
application for Letters Patent of ‘the United
? I
In such cases the'track switch is preferably oper;
erating lever locked in its normal position
electric lock adapted 17o/be released by energizing ‘
lice for governing the reversible linecircuit sys
an improvement
In respect upon
to this
in'y invention
As' herein disclosed, the apparatus at the con-`
trol oiiic‘e includes a ‘series of directional relays,
'one Ifor each block, »each >Öl" which governs the
transmission of codes 'for'.controlling` the direc
ditional passing tracks used but infrequently, for
for the protection of main line trainl movements;
A feature of my yinven'tii'ili the provision of
electrically interlocke'd 'circuits at~ the ,control of;
ling apparatus.
of trains doing local switching, such as thos
leading to industrial sidings or the like "or to adi
which they provision of power switch machines is
unwarranted, but for which locking is required
for _each detector section including a power ‘opfer-v
ated track Switch, a `lalrlp foreach single track
stretch, and lamps for the main and passing
tracks of the double track portions.
tric switch- lockst The railway sy tems to which
my invention is applicable include i numerous
main line train for enabling the 'switch to be ‘unev
locked to permit the train to enter the’side track,
together with means controllable by the central
office operator for distinctively controlling the
reversible line ycircuit system for the block con'-vv
taining the hand throw switch, to enable the
switch'to be unlocked for a movemerit‘out of the
side track, provided'rio train is approaching from
either direction. In' respect to this feature, myrv
invention is an improvement upon that disclosed
in a pending application for Letters Patent of the
The drawings may also be arranged in a dif
ferent manner to facilitate the tracing of the
United States, Serial No. 462,354, filed October
circuits involved in the control of traffic move
17, 1942, by Harvey A. Haines, for Railway traf
ments through a double track block containing
ño controlling apparatus, now Patent No. 5 a passing siding. When Fig. 1A is placed at the
2,367,723, issued January 23, 1945.
right of Fig. 1B, these views together show the
Other objects, `purposesand features of my in
track diagram _for the block. having the signals
vention VVwill> be'pointed out as the description
4R and 2L at its opposite ends, and also show theV
cnice circuits for the control'cf these signals in
I shall describe one form of apparatus em ‘ l0. _connected form.
bodying my invention, and shall »then point out
The track plan and trackway circuits for the
the novel features thereof in claims. ' ’
' `
[signals dR'and 2L controlling movements intoY
the passing tracks may be similarly shown in
connected-form, together with the circuits for
Referring to the accompanying drawings, Figs. »
1A and 1B, taken together, illustrate,- two adja
cent panels of a control board located at a cen
I5 their respective'approach' sections, by arrang
’ tral office and arranged for the centralized con
trol of the trackway apparatus of myjnvention, , ,y
the later being shown in Figs.v 2A to 2F, inclusive.
It is to be understood that the control `board-in-y
ing Figs. 2A-2F vside by side in the order 2D, 2E,
2F, l2A, 2B, 2C. 'I'he main track block extends
from 'signal 4R., at its left-hand end, through
sections 3T, IlLAT, ZRAT and IT to signal 2L.
its entirety comprises a number of such panels, 2o Sections 4LBT and 2RBT are also provided with
alternate panels being generally similar to Fig.
track circuits which serve to indicate the occu
1A `and the intervening panels to Fig. 1B. ‘
pancy of the, passing track by the lighting of a
Figs.' 1A and 1B, taken together, with Fig. 1A
at the left, show the'oflicev circuits for the con
lamp on the" track diagram of Fig. 1B, and also
provide approach lighting control for signals
trolof atypical single track block, suchras` is ¿5 ALB and 2RB.
illustrated bythe miniature track diagram shown
Similar reference characters refer to similar
thereon.Y This block extends from a head block
signal 2BA or 2RB, at the left-hand end of the
detector track scction‘for the power operated
parts in each of the several views.
The code system employed for communication
between the oñice and stations may be lof’ any
track switchv IW, through the single track stretch
type, and as a consideration of its de
to the Yopposing head block signal 4LA Vor 4LB, 30 suitable
tailed mode of operation ,is not needed for an
at -the right-hand end of the detector track sec
understanding of my invention, this is illustrated
tion -for- a similar switch 3W. The track diagram
herein only in diagrammatic> form._ Asshown
alsoshows a Vnumber of electrically locked hand
herein it is assumed that this comprises the re
throw switches in various typical locations .des 25 mote control system‘of LettersPatent of the
ignated SAW, SBW, 'IW and 9W, respectively.
Figs.' 2A to 2F,'inclusive, arranged side by side
United States No. 2,197,130, issued April 16, 1940,
to Lloyd Vf Lewis, having coding units at the of
withy Fig. 2A at the left, show the track plan and
fice and at the several field stations connected by
circuits associated with ythe single track block.
line wires Y-Z as indicated diagrammatically
-Figs. f2A and 2B taken together show the local 40 on the drawings, over which control codes are
,circuitsv forV switch IW, located in the detector
transmitted at times from the office to a selected
track section IT, 'and for the adjacent head block
station to position a group of'polar stick‘control
signals ZRA, 2RB and 2L. This group of traf
relays at that station, while at other times indi
i'icgoverning devices is manually" governed from .
cation codes are transmitted over the same line
the >oflìce'by the operation of a coding unit des- A“ wires from the different stations, one station at
4ig'nated “Station No. I,”-shown in Fig.. 2A..
a time, to position a group of indication stick re
Fig. 2C shows the local circuits for a typical
lays associated with an invidiual control panel
pair of automatic signals identified by the refer
for the station transmitting the code.
ence' characters 2l and 22 and located within
It is to be understood that each such code in
the single track stretch. Fig. 2D shows circuits .50. cludes a distinctive combination of elements for
Yfor similar signals 23 and 24 at a second location
selecting the desired station and the correspond
within Vthe stretch. Figs. 2E and 2F, taken to
ing oiiîce panel to temporarily establish a group
gether, show the circuits for the control of a
seven channels .for communication Vbetween
group of devices corresponding to those of Figs. `„of
such station and panel. For simplicity the chan
y2A and 2B,- comprising the power operated track 55 nels are indicated conventionally on the draw
switch 3W located in a detector track section 3T,
ings as individual circuits, the control channels
and the associated head block signals 4R, 4LA
being represented by a group of wires I-1, and
and' 4LB, which group of devices is manually gov
the indication channels-by another group of wires
erned from the oñice bythe operation of a cod
each adapted to be'energized from the pos
ing unitA designated “Station No. 2,” shown in 60 9-15,
itive or supply terminal B of asuitable local
lThe circuits for controlling the electric locks
for the hand throw switches vary in some re
source of current at one end and having a con
nection to the negative or common return ter
minal c of such source at the other end. 'Chan
spects in” accordance with the location of the
nel 6 is not used in connection with my inven
switch with 'respect to the signals, and accord 65 tion
and is not shown.
' ingly a numberof- circuit arrangements are shown
control code is initiated manually, by
tor illustrate different situations. These include
momentarily operating a starting push button,
circuits for two handthrow switches designated
after placing the control levers ofthe panel in
SAW and ï5BW,'located at> diiîerent points in >an
the desired vpcsiitions.y Fig. 1A showsthe con
intermediate block section’of the single track 7o trol'panel for the control ofthe track switch
>stretch and arranged to provide _an additional
l W`4 and the signals at Station No. I, and when
passingftrack for emergency use,ïand also in'
the starting button ISTB shown in this view
clude a switch ‘IW located in-an end section of
is-operated, a starting relay IST becomes ener
the single track stretch and a switch 9W located
gized, initiating a code which operates a selector
in the main track of the double track stretch.
75 relay OI S and therebyextends thel channels I??
. Relays fZlLiHK and ‘ZRHKm‘elcontrolled over
*from vthe office to :Station No. I, Fig. 2A', to :ene-r
gize selected ‘register relays .'IFZ, IF4, letc., in»
icludedin „certain of ?the channels. A-t the :end of
thiscontrol code, a delivery relay ID ismomen-Y
ichannels lf3 and I5 bythe signal 'indication relays
IZLGP 'and ‘2R’GP 'so `as to light >lamp >ZIN’E Vwhen
'the signals at Station NoÄI yare at `st'op,'to light
îlamp .2LE when signal 2L is cleared, andtolight
tarily energized, thereby position'ing'varicus stick
îlamp 2RE when signal ZRA or ZRB is'V cleared. '
polar control _relays to normal or -reverse in ac
œordance with the condition of energization of
Linne channels. âIt is to be understood Ythat as
Indication codes initiated. at Station No. 2 cause
ît‘he energization of the :selector relay 2S, Fig.
12E and ofthe delivery vrelay 02D, Fig. 1B,fto
shown herein the normal position of each polar
:ized relay is taken :as .the left-hand position and
îeilect a ‘similar control, over channels Y9, II, I3
.fand Iî5, of the lamps Aassociated with levers 3SW
-and ASG in accordance'with the condition- 4o'f
‘switch »3W and of 'signals 4LA,"4LB and 4R.'
-The :remaining indication stick ,relays 'of Figs.
.iA and :1B ycontrol the lamps .of Íthe track dia
that ."lt :closes its normal or left-‘hand vcontacts
fwhencurrent 'from terminal B ilows Afrom left
xtoright’throug'h its winding to .terminal C, and
that :it closes its right-hand or reverse contacts
when theñow vof current vfrom terminal B through "
gram in such a manner as to `continuously indi
’its winding is from `right .to left. The stick polar
control relays at Station No. »I include a switch
control :relay IWS and an vauxiliary relay 'IWIS,V
cate 'the .presence of ar train 'by -the lighting of
one lor `more lamps, wherever the. train may be
in the controlled territory. Relays ITK and 3TK
control the lamps ‘ITKE and 3TKE, land are con
trolled over channel ‘I0 fby‘repeating relays `ITP
>and -STP of the track relays for 'the detector ’track
sections IT -and 3T, in the usual manner.
The block indication relay ZLAK, Fig. 1A, and
lrelay TARAK, in Fig. y1B `at the right jointly cause
lamp BKE to be .lighted t0 indicate the presence
of a 'train in the `single track stretch, and are
controlled over channel I2 by approach relays
voperable íto'norm'alor reverse over channel I or
'.3 in accordance with the position of the vswitch.
,liever ilSW, Fig. 1A, 'two signal control 'relays
¿LHS land .2RHS, operated to reverse over chan
nel 5 or -`I when the signal lever yZ‘SGr of Fig. 1A
is placed in its left-hand or right-hand reverse
position, respectively, and to normal when lever
'.ZSG is placed in its normal center position, and
two ‘.tr‘añic .relays ZRFS and `>2L£FS controlled over
.channels v2 and 4. Relay ZRFS is controlled by
a directional relay 2--4LP of the stick polar type,
.shown in Fig. 1A, the position of which desig
naites the Adirection -for trafhc movements-into
the `ablock, contact a of relay `2--IILP controlling
direction :indicating lamps WFE and .EFE Vmount
ed .belowfthe `track diagram. Relay ZLFSis con
trolled ìby the directional relay 4-2LP located ‘
in the 1adjoining panel `at the ‘left of Fig. 1A. Fig.
1B shows the control panel for the switch 3W
and the “signals rat 'Station No. 2. The operation,
lof :the starting button 2STB shown in this view
.energizes'a :starting relay .2ST and a selector re
lay 02S, thereby extending channels I-‘I to Sta
tion JN0. 2, to energize the register relays 2F2,
z2F.4, etc. >rAt the ends of each control code de
livered by relay 02S a delivery relay 2D is mo
mentarily energized to operate the polar stick
control relays of Fig. 2E to >normal or reverse in
accordance with `the »condition of energization of
channels lI----'I. The switch control relays SWS
and SWIS are controlled in accordance with the
position ofthe switch lever 3SW, and the signal
control relays 4LHS and IIRHS in accordance with
the position of the signal lever IISG. The trahie
Z'LAR ;and_'f4RAR, respectively.
Relay '.2LAR,
shown .in Fig. 2B, is `controlled over a circuit «ex
tending from one terminal B of ‘a ,local source
:of current at front contact e of the track relay
y22TH, Fig. 2C, over back «contact c vof :a direc
tional stick relay 22SR, which as hereinafter
described, is energized when a trainfmoving 'from
left to right occupies section 22T or 23T, and
over 'contact a of the track relay 2-ITR, wire I8,
lcontact a of the track relay ZLATR, through 'the
>winding of relay ZLAR, and 'over contact c -of
relay ZLATR, and line wire I'I to terminal C of
`.the saine-source at contact c of relay 2 ITR.
Relay IRAR, shown in Fig. 2E, is controlled
over asimilar circuit including line wires I9 and
'.20 and the .front contacts-of the track relays
45 4RATR, 24TR and 23TR, its circuit alsoinclud
ing a back contact of a directional stick relay
23SR which is energized when a train moving
from right to left occupies section 23T or 22T.
The block indication relay 2RAK, Fig. 1A, con
f50 trols va block indicator lamp ZRAE in the track
diagram of the adjoining panel at 'the left, to
indicate the occupancy of the main track of the
`double -track stretch. Relay 2RAK .is controlled
relay ARFS is controlled by the directional relay
over `channel I4 by relay ‘2RAAR, Fig.> 2A, which
A-«ZLP shown in Fig. 1B and Vrelay ALFS bythe
turn :is controlled by `a signal lighting. relay
similar relay 2-4LP of the adjoining panel at 55 vin
2RAER in series in the reversible line circuit
the left.
including line wires 39 and 40, hereinafter Ide
.It is to be understood that each station coding
unit is arranged to initiate an indication code
in :response to each change in position of any of
scribed. Since this line circuit includes vfront
contacts b and d of the track relays 2RATR
the indicating relays which govern the energi 60 Aand, -IlLA'I‘R, relay ZRAAR reflects the condition
of track sections ZRAT and IILAT.
zation of channels 9--I5 and also in response
-The block indication relay 4LAK, Fig. 1B, con
to a .received control code, even if no such change
trols lamp IILAE to indicate the presence of. a
occurs. Each code initiated at Station No. I
in the upper passing vtrack of the double
causes the energization of a selector relay IS,
Fig. 2A, and at the end of such code a delivery 65 'track stretch. Relay 4LAK is controlled vover
relay OID, Fig. 1A, is momentarily energized,
causing the associated indication relays K to
assume energized or released positions in accord
ance ywith the condition of energization of chan
nels A9--I5.
Relays INWK and IRWK are controlled over
channels 9 and I I by the switch indication re
lays INWP and IRWP, Fig. 2B, which reflect the
position of switch IW, and serve to light lamp
INE or IRE to indicate the position of switch
'channel I4 from Station No. 2 by relay IILBAR,
shown in Fig. 2F, which relay is energized over
line wires 29 and 30, and front contacts a and b
of the track relays 4LBTR and 2RBTR >from ter- ,
70 minals B and 'C of thev local source at Station
No. I.
The polar stick relay 2-4LP, in Fig. 1A, `serves
as a directional relay for Vcontrolling the direc
tion 4of 'tral’lic vmovements in the single track
block and controls the traffic relays SZRFSand
` '25404,803
4LFS, which govern the reversible line’circuit sys
tem for the-single track stretch, by the operation
VZRFK to’termina’te theV control 'ofrvrelay 2ST-‘by
of its contact c, which controls', the energization
of channel v2` in each control. code transmitted
' > Relay 4-2LP, in Fig. 1B, similarly controls the i
ì to `Station No. I or No. 2.
Relays ZRFK and
4LFK in Fig. 1A are slow release directional stick
relays controlled byl relay 2-`4LP and by lthe
button ISTB and to light lamp EFE. . Y
traiiic relays 4RFS and ZLFS, which govern the
reversible line circuit for Vthe mainv track block
extending from the signal 4R to signal 2L, bythe
operation of its contact c, which governs the
4block indication relays ZL'AK of the same panel
energization of channel 4 in each control code
and 4RAK of the nextrpanel at the right.v Relay
transmitted to Station No. l or No'. 2..' Relays
ZRFK or v¿ILFK picks up over contact b of relay 10 4RFK 'and VZIEK, in Fig. 1B; are slow release
2--4LP inv response to the energization of both
directional stick relays controlled 4by the indicaà
`block indication relays, completing a circuit. at
Vits front contact c over contact a of -relay
2-4LP to light lamp VWFE or EFE to indicate
`tion relayr 2RAK of the adjoining-panel atl the
right, which indicatesthe condition of the main '
trackf‘ blocky'and these relays whlenf released
the traiiic direction established by relay 2-4LP. 15 render the starting button for the entrance end
Relay 2-4LP is controlled by the track, signal
of this block, asydetermined by the position v:of
and block indication Vrelays and signal lever of
4'-2LP, effective to,tra'nsmitvcodes to both
the same panel and of the next panel to the
ends of the block. Under proper V.conditions relay
right.V When the single track block is vacant and
4-2LP is operable to the left 'to set up'the right
a the head block signals are `at stop, as indicated 20
to-left trañic direction by placing lever 2SG„of
by the- indication relays, if the contacts of relay
the adjoining panel at the right in its left-hand
,2J-'4LP point to the right as shown they maybe
reverse position, or to the right toV set .upthe left
operated to the left to ‘set up the right-to-left
traflic direction'by placing lever 4SG
traiiic direction by placing lever 4SG of the next
of the same panel in its right-hand reverse posi-ï'
panel at the right in its left-hand reverse posi 25
tion, as hereinafter pointed out in detail. The
Fig. 1A also includes an electric switch >lock
opening of the right-hand contacts b and dof
control lever 5-'ISW and a repeating relay
relay 2-4LP releases relays ZRFK, ZLAK and
5-1LP therefor by means of which the trai-lic
4RAK, extinguishing lamp EFE. If the starting
relays 2RFS and 4LFS may be reversed toestab
button 2STB is now operated, relay 2ST is ener 30 lish both ends of the single track block as exit
gized over contact a of button ZSTB, and a code
is transmitted to Station No. 2 to reverse relay
ALHS, which controls signals 4LA and 4LB, and
since the right-hand contact c of relay 2-4LP_
ends to render the signal line circuitsv available
for indicating that the block is unoccupied at ,the
location of any hand throw switch in'the’block.
By this means the crew of a Vtrain on a side track
is open, this code also operates the trafiic relay 35 leading to the main track of the single track
4LFS .at Station Noi 2 to normal to thereby es
block over a hand throw switch may unlock thek
tablish the right-hand end of the block as the
switch under proper trañìc conditions when au»
entrance end. The operation of relay 2-4LP to
thorized'to do so by the central -oii'ice operatori.
its left-hand position, followed by the release of
Fig..1B includes similar arrangements includ#
relay ZRFK, prepares a circuit from terminal B 40 ing'the electric lock control lever SSW and the
at the left-hand contact b of relay 2-4LP over
repeating relay SLP, for controlling the traffic
Wire 56, contact CV of. button 2STB, wire 51, back
relays dRFS. and ZLFS which govern the reversi
contact d, of relay 5-lLP and' back contacts f
ble line circuit for the block comprising the main
of relays ZRFK and 4LFK, whereby the starting
track of the double track stretch to provide means
relay‘lsT, at the‘left, is energized alongfwith ' for releasing the electric locks of hand ythrow
relay 2ST, to transmit a second-code to Station
switches located in that block.`
i Ä
~ ’
No. I to operate relay ZRFS to reverse over chan
Each block signal shown in Figsf2A tol 2F is of
nel 2, which is now energized over the left-hand
the searchlight type having a three position mech
contact" c of relay 2-4LP, and thereby establish
anism G adapted to indicate caution or proceed
the left-hand end of the block .as the exit end. 50 when energized in a normal or reverse /direce
The block indication relays 2LAK and 4RAK are
tion, respectively, and to indicate stop when deen‘-`
then -reenergized by indication codes which fol
ergized, such as is shown in Reissued Letters Pat#
lowv these control codes, thereby energizing relay
ent of the United States No. 14,940, of August 31,
dLFK to light lamp WFE and to terminate the »
1920, granted to E. J. Blake.V Each mechanism
control of relay IST- by the starting button ZSTB. 55 has
a circuit controller having front contacts
Under similar conditions, 'if the contacts'of
over which a repeating relay such as relay ZRAPC
relay 2-4LP point to the left, they may be
or 22PC may be energized when the signal-indi
operated to the right by placing lever ZSG of
cates caution or proceed to govern .the polarity
the same panel in its right-hand reverse position,
thereby releasing relays dLFK, ZLAK andÃRAK
and extinguishing lamp‘WFE. This prepares a
circuit for relay 2ST of the adjoining panel at
the right, which extends from terminalY BVv at
the right-hand` contact b of relay 2-4LP. over
contact'd of button ISTB and back contacts g
of relays 4RFK and ZLFK, back contact e of. relay
ofthe current controlling the next signal in the
rear,«for the same trañic direction, and also has
back contacts closed only when thefsignal indi
Cates, stop over which a signal indicationrelay
such as relay 2RGP or 2LGP may be energized
lor Vwhich may be included in the circuit .for an
opposing signal as illustrated by mechanism ZIG
5.-;1LP, and .wire V68, rendering button ISTB
eifectiverto initiate the transmission of codes to
Each intermediate' signal in the single >track
both stations, whereby relay kZRFS isl operated
block, such las signal 2| or¿22,.has a directional
to normal to establish Station No’. las the en 70 stick relay 2~ISR or 22SR which vpicks up _when
trance end of the block, and relay 4LFS to reverse
a train passes the signal/at caution or proceedto
to establish Station No. 2 as the. exit end. These
supply current of the proper polarity to the line
control’ codes are followed by‘indic'ation codes
`circuit for the next signal in the rear to -operate
which reenergize >the vblock indication‘ relays
such` signal to its normal or cautionposition' for
ZLAK and 4RAK; and' thereby energize :relay 75 the- control ofafollowing train;
temyprovides vcircuits -for the line' relays 4RHD. , ,
The reversible line; circuit; systems furthe- single
and: 2li-ID, which govern the. opposing headtblock '
track: block: comprises a series of tandem: con-I
signals> 4R; and 2L for main linev‘m‘ovements only',~ ;
necterlLline.~ circuits'. each of which may’ be; ener
these signals being‘/ operable to indicate caution',
gized atv either: endl by1 connectionsito the termi
nalsî B and; C’ of a. local‘. current. 'source'.
to. govern train movements; into'the upper pass*
ing track, independently of‘ the-line’relays. As
system'. provides; circuits` for. energizing eitherv the
line relay Z’RHD, Fäg'. 2B; for.' signals ZR'A and v
2RB„ or the line relay 4‘LHD,.Fig. 2E, for signals
ZLA'. and'ALB', and for energizing> the mechanisms
shown', the reversible line circuit sys-tem for the ~
main track stretch is; set> up for; the' left to right
traflic direction with the trailic relay ¿IRES nor
rnal> and relay 2-LFS reversed._ The line relay
for the intermediater signalsV 252 and' 24, or 2I' and
ARH-D is energized in the` normal' direction in
serieswith the‘approach lightingV relays ¿ILAER
231., and; in. addition provides - circuits available at
timesff'or: theî= release ofi electric switch lo'cks. As
overx line wires 39 and Mlgiits’fcir-y
cuit including' the normal contacts b and' d of'
shown, the system isV setáup fïor- the leffteto-right
traine direction with the trañic relay ERES nor-r
relay ARIES,y a: back: contactx'd` of' a stick relay "
mali and;` relay 4LFS reversed'.` Mechanism MG,
B'I‘ESI associated withi switch'` 9W; front contactsFig; 2D, is energized in’ the normal direction in
«andad‘ of an indication relay awLP» fori switch - 'l
series- jwith the approach- lighting l'relays 23E-R
9W, and of the vtrack relays 4LATR and 2RATR§1`
and dRAER: over-lineI wires 3lP and 32., its: circuit
the` reverse contacts b‘and d‘of relay 2LFS; con'
including back cont‘act's'bland dt of relays 2'3SR
tacts be and d of'relay@ 2R’APC.“ controlled' by sig
andî'23PC for“ the opposing' signal' 23i, front con 20
nals 2BA >and `2»RB-, back contact c of the oppos
tacts'. b and» d of the-»track'relays 26T-R, 4RATR
ing line relay`- ZLHD and front, contacts c of" a'
and? 3TH», and’ of‘ an indication relay 'IWLP for
repeating- relay> ITP forth‘e track relay ITR ofä "
switch' TW; back~1contact d’ of a stick relay ‘ITES
section> IT and of: an approach locking relay
associated with-»switch 7W, the‘- reverse contacts
ZLAS for signalv 2li.,> the: contactsv ofk relays: ITP'- '
banditi> of the trafli'c relayïßLlE‘Sf,> contacts bandïd
and:.2LAS' in this circuit being bridged by'afront i
of' the polel changer relay V¿IRAPC for signal 4R,
“contact df of a switch indication ‘relay’ IRWP‘ f
and: contacts c of the line relay liLHD and of
an'y approach locking relay 4LASï for signals
closedï when switch I`Wv is reversed'. It will'Y be n
seenY thatv ther control limits: for` signal 4R as
established- when- switch'` 3W"` is normal, extend?l
to» signal,- ZR'A ifu switchv IWTv is’ reversed, and
Mechanism 22G, Fig.,> 2C', is energizedA in the
reverse direction in series' with the» approach
lighting> relays’- Z’IE‘RP and'î MER over line wires
35'A and 36 extending to- the location of switch
SBW‘l and' over line wires '33‘ and 34 extending
through s‘ectionf IT’to signalZL if r'switch IW^~is
This lin-ev circuit system is: 'seti up’ 'for move
ments. from. right to` lef-thy' operating relay 4RFS
to“ reverse and*A relay ZLES to,` normal in-y which?
from thatY point to the location of signal 24,V its
circuit' including back'cont'acts bÍ and d of' re
case relay' ZLHD‘m'ay: bene'nergized overy similar ï'
lays II'SR' and ZIPC’ fonth‘eopposing signal 2|,
front‘fcontacts b and d"of"tl’1e‘ track relays 22TH,
andiZ'STRi, and a front contact aj of’a‘ï relay SARÍK4
adjacent switch"l 513W controlled by these track
circuits; including ,thefsame'î line wires 39? «and
Eachi signal i'sjlighted by‘a lamp E contained> '
in-'its mechanism, which as shown is normally '«
relays',- front contar-:tsl af, b', c and d“ of' an indica
dark, becomingv lighted; to. cause the signal to`v
display its indications. when' one or more 'track'
anda back contact d’of a stick relay STES' asso
sections in approach; to the Vsignal are occupied'.
ciatedl therewith, front contacts l)l and’ d of> re
The lamp ZiI'Effor signal Z’Iï, Fig; 2C, for exam
layv 24PC f'or' signal 24, a front’ contact j of the 45 ple, is- lighted?bythe release' or’ the lighting re-`
track relay 24TH, and contacts-closedv by mech
lay 2 EER, whichaisîin- series` in thereversible line
ani‘sm 23Gî when» signal 23 indicates stop.V The
circuit for mechanisms> ZZG‘ and 23G'. The light
tionrelayv i'rWLP'f forl switches SAW 'and' 5BW,'_
line relay` ZRiI-ID‘, Fig-1 2B, is~ energized reverse in
series with the approach lighting relays ZLAER
ing of signals 22,-r 23‘l and 24' is' controlled bythe "
including the normal“v con-tactsjb andl d` of thel
traffic relay ZRFS, f-ront contacts bi`~ and d of the
nalV 2L„ Fig. 2B“, the circuit for lamp 2IlGlil’isv `
similarly arranged' relays.r 22ER‘, 23ER and ZIIER,
and-v 22ER over line wires 3lr andr` 38, its circuit 50 respectively; I'n the case’r of the head block sig- l
controlled'by a slow release‘repeater relay ZLAAR, '
track relays> ITR, ZLA-'I-’R and ZIITRQan'd‘ of the
relay 22PC for signal'22'f, a iront contact f of the
track relay 22TH, and contacts» closed by mecha
nism 2 IG when signal?> 2 I‘~ indicates stop.
It follows that signal 2li`I indica-tes caution andsignal 2'2î indicatesI proceed, but signals 2BA
and 2RB> are atbstop- because their local circuits
are open.
The reversible line circuit system for the sin
of. the'lighting> relay ZLAER, provided in orderto
55 prevent a momentary interruption ofthe lamp
circuit during: the reversal ofY thel line polarity i
by relay' ZLAPG‘. The lighting circuits for sig‘
nalY 4R, and also- forv signals> ZRA and' 4'LA, are`
similar to that` i'or- signal 2L, while’ those fori
60 signalsy ZRA` and ELB‘are; controlledv by the track ç
relays 2RB'I1‘R' and VliLB'I‘R. of the corresponding:
gle. track stretch may be set' up for traffic move'
l approach sections in theupper passing track.
Each power operated'track switch' such as IW'v
ments ini the opposite direction, that is to say,
is operatedñ byfa snitable'switch machine such as
from right t0 left, by operating relay ZRFS to
its: reverse position and:y relay ALFS to normal, 65 ISMr Fig: 2B:- having a». control circuit’reversilzvly>
energized over» the polar 'contacts'ia' and b of the."
in which; case: mechanism ZI'G' will become S1181”
" corresponding code controlled relay IWS and in
the'. normal direction and mechanism
cluding fronti contacts a and b of a switch lock
ESG and-i relay ALFD: in the reverse direction. by
ing relay I-LR, Fig. 2A, -whichrelay when ener- ,
the energizati'cn of circuitsssimilar: to thoseV just
-70 gizecl indicates that conditions are proper for
trace'd,_ as will'be apparent'ffrom the; drawings.
the operation of' the track switch. The position
Traiilc movements over themain track of the
double: track pdr-tion`V arev controlled over a re
ver-sible» line circuit system' similarly arranged Y
off` switch; IW is indicated by _the normal and re- f
verse switch indication relays INWP and IRWP,v
which are4 energizedaover a. switch circuit cone
for energization- at> either enid4 by' thev operation
ot „the tra-flic relaysi vll'Rilï‘S. »andi LEFS. Thisv sys 75 troller` contact; N or Rt, respectively',` andV overl
' 2,404,303y
`contact d of relay" IWSyo’nly'when the 'switch
' and is in agreement with the normal or> reverseV »
position 0f its control relay IWS.Y
f '
of the route relay ZRAH or ZRBH, and has a back
contact e in the circuits for the mechanisms'
yis"lock'e‘d mechanically by the switch machine
ZRAG and ZRBG for these signals, «a front con- ,
tact d in the circuit for relay 2LH controlling ‘the
>The'code controlled relays as shown in Fig. `2A 5 opposing signal 2L at the same station, a front
> include _an auxiliary'relay IWIS, which is oper
contact c in the circuit including line Wires 31
ated to normal or/reverse over channels I and 3
and 38 for controlling-the opposing signals 2 I, 23,
in parallel with relay IWS.` The circuits for
4LA and 4LB for the single track block, and a
reIayIWS include a contact d of relay |LR,fso
front contact b, Fig. 2A, in the circuit for relay
that although the auxiliary relay IWIS is yfree 1o ILR, while rel-ay ILR has front contacts .a and b
to respond to the switch control elements of each
controlcode, the switch control> relay IWS re
sponds only ifthe switch is free to be operated at
Y the tiI?ethe codevis received, thereby avoiding
in the operating circuit for switch IW, and a back
contact c in the circuit for the mechanismffor
each signal governing trañic movements `over
“switch `control storage” and ,the . consequent 15
Y operation of the track switch without manual su
A pervision,
`following the 'energization of'V relay `
AThe local'circui'ts for the head block signals at
Station No. I are manually'governed b'y means lof
a'polarV neutral signal control relay ZGR shown
in Fig-.~2A, in accordance with a feature of my
Relay 2GR is deenergized when re-
lays'2LHS and 2RHS are normal, as shown, and
isenergized normal or reversein response to the
reversalof relay ZLHS or ZRHS, respectively, over
a pick-up circuit including corresponding normal
or reverse contacts c _of relays IWIS and IWS,
and when relay 2GR becomes energized, over a
>`stick circuit including its own front contact a. ' 1'
I W.
Relays ZRAS and ZLAS are controlled by time
measuring apparatus inïa Well-known manner, '
so as to delay their energization fora suitable
time interval following lthe manual restoration of
asignal tostop.. 'I'his .apparatus ias shown in
20 Fig. 2B includes a thermal relay ZATE, a stickf:
relay ZATES and a checking relay 2A”I'EP„controlling a circuit including contact f of relay
IRWP over which relay 2RAS is energized at the
end of a relatively short ,time interval following
25 the return of signal 2RB to stop, provided switch
IW is reversed, and these relays together with>
the similar relays V2BTE,-2B'I'ES and ZBTEP pro- ~»
vide an appropriately longer time interval at the ~
end of which relay ZRAS or ZLAS becomes ener-r Y
30 Vgized, following the manual return of signal ZRA
It will be understood that ’relays IWIS and IWS
or 2L to stop, when switch IW is normal. The
assume dissimilar positions in response to a code- Y time measuring'apparatus is set into operation
received when relay ILR is released, provided the
byV the energization of a repeating relay ZASP,
code includes elements for changing the position
Fig. 2A, controlled by the approach locking relays i
of switch IW, since under this condition relay 35 and byY the signal 'control relays ZRHS and .Y
IWIS .will'reslüond but Arelay‘lIWS will remain in f
its lastoperated position-corresponding to that
„ ZLHS, and has checking contacts gin circuits con-r
trolling the signals to insure that the time'me'as'
uring apparatus is in its normalposition whenV
Y become energized in response to a code for clear
a vsignal is put to stop 'tol initiate its operation, g
ing the signal for a route oVerÄswitchYIW/which 40 comprising a back contact b of the thermal relayf.v
differs from the 'one already established,»if such’
such as relay 2ATE inthe circuit `for its checking "
code is received when relay ILR is released and
relay 2ATEP, a front contact a of relay 2ATEP in ‘
of switch IW. It follows thatrelay 2GBI will not
the switch is therebyelectrically lockedv against'
the circuits for the mechanisms G, and aback
operation to the position required for the diiTer
contact c of the associated stick relay such asv
ent route, and the inadvertent clearing of the 45 'relay ZATES in the circuits for the route relays
signal for the already established Valternative
RH and LH.
route under this condition is prevented.
’The manually controllable relay ZGR, and the
line relays ZLHD and 2RHD jointly control a '
' '
y Circuits are also provided for reenergizing the»
'approachl locking stick relays automatically, fol- }
' lowingV the restoration of the corresponding sig- .
routeècircuit network, shownfin Fig. 2B, compris 5<lLLnals tostop by a passing train, which depend ;t`or.¿l
ing circuits selected according to the position of ‘
their `operation uponY the releaseof the ,trackvi
switch IW by the relays INWP and IRWP for
relays for two. diii'erent tracksectiona- When '
controlling the route relays 2LH, 2LD, ZRAI-I and
a train enters section IT, for example, the track .
ZRBH -which‘in turn control the head block sig*
relay ITR releases, deenergizing aìslow release;
nal mechanisms 2LG, 2RAG and ZRBG. The 55.*.;.repeating relay ITP, Fig. 2A. Relay ITR inter
- display of stop indications by the signals is mani- K
fested by the energization of signal indication '
rupts the signal circuit by opening its front con- f
tact a, Fig. 2A, to restore the cleared signal to
relays ZLCiP` and 2RGP, governing the approach ' stop and thereby energize the signal indicationv .
locking stick relays ZLAS and ZRAS,` which'to
relay ZRGP or‘2LGP. v'I'he closing of back con
gether' with relay ILR serve to electrically inter-y ôfygtact a of relay ITR completesV a circuit momen- "
lock the switch and signals in the following
tarily over front contact a of relay ITP to restore
manner: Relay'ZLAS, controlled by signal 2L, is
the operated signal control relay ZRHS or 2LHS` .
released in response tothe energization of the
to normal, but without energizing relay ZASP, '
route relay 2LH for that -signal and has a back
the circuit for which is open at front contact a- '
contact eV in >thelcircuit formechanism ZLG for 6u' Í‘off relay ITR. When the train enters the next ï
signal 2L, a front contact> d in the circuits for ’
section of its route, a portion of the train being in
relaysZRAl-I and ZRBH controlling the opposing
' section IT, a circuit is closed over contacts c or
signalsrat the ‘same station, a front contact c,
relay ITP, Fig. 2B, and of relay ,ZRATR or
Fig. 2A, in the circuit including line wires 39 and
ZRBTR to pick up relay 2LAS, or over contact d .
40 for controlling the opposing signal '4R at the’ 70 jof relay ITP and contact e of relay 2LATR to '
oppositeend of the block, and a front contact b,
pick up relay ZRAS.
Fig. 2A, in the vcircuit for the switch locking relay
~Relay`2RAS, controlled by signals 2RA and i
V'I‘he local circuits at Station No. 2 are manu
ally controlled by a polar neutral relay 4GB, Fig.
2E, like relay 2GR, and are similar to thoseat
2RB, is released in response to the energizalììQD v75 Station' No. I, lexcept that the circuits for the i
twodirections areinterchanged, but'> in other re
spects; these circuits functionin the same manner...
Each hand. throw switch shown' herein, such,
as the Switch âAW, Fig. 2C; is> to be understood.
to be2 equipped with a suitable switch stand such.
asis shown in LettersPatent ofthe United Statesl ~
lease of atrackrelay. For: examplerelay STEP
is energized' by‘theclosing of back contact c o-f an.
approach. relay BAR‘, which relayÁ is released by a',
repeating relay 22TP of the track relay 22TR or'
g by the. track relay 23TH, when a trainy enters sec.
tion 22T or 23T. It is to be understood` that. the
No‘..25l84,8.70, issued. December 26",A 1939, to Her-A
bert¢et al., having an electric lock. such.
asis shown in;Y Letters Patent ofthe; United Statesr
Nol. l,126,834,.issued` February 2, 19.15, to;Walter 101
P. Neubert et al. Each. such switch stand has a
handfthrow lever 8’ forroperating the switch, which
isl normally locked. to.. holdgthe switch. in its
time interval measured by the apparatusismade
long enough to enforce the proper. speed' reduc»
tion in passingÁ from signal 22 to; switch 5BTW‘ or.¢
from signal Z3’ to.. switch S-AW, whichever „is
the greater distance».
The circuit for energizing the lock; magnet7
eAWL or SBWL includes;- front; contact i? of nela'y“
äTES. and ist prepared by the; operation of thes
thermal relay through- a heating-z and cooling:
cycle during which relay âTES is.y picked upf, and;
normall position by a lever latch attached. to a.
, segmentZâ heldin» its lockingpositionby the bail’.
oía >padlockv 5.0:, as indicated. diagrammatica-lly
herein andas shown in detail'. in theNeubert et al.
which is terminated when relay:551??'returnstoits;` Y
andrto opencontact; 49’to release. an indication> re
lay- such as the relay 5WLP, Fig.. 2D.
If trañic- conditions as reflected by the. circuits'
are such that. it is proper to- operate the switch,
the'lock. magnet
will become energized in.
response to the release of relay 5WLP., opening.
contact 48 in the circuit for relay EWLP andi lift.
ing-thelocking dog 2:1 to permit segment 25'. to be
moved- to its full reverse position inv which the
switch operating lever 8. is free to be operated,
andas explained in` the Neubert et al. patent
lever 8.` holds segment 25 reversed as long as the
apparatus is> in its normal; condition When.- the
normal position.. A front contact a’ of relay SAR;
patent. To unlock: the switch the padlock must
and a back; contact d"` of. relay EìÈFESy are included:
first-be. removedby the train crew.. This permits.
thesegment 25 tobe: moveda short distance, lim 20 in. the-signal line> ci‘rcuitzto prevent a trainimoye»
mentÍ over the hand throw: switchesY unless» theI
itedby‘the locking dog 2l, to’close contacts. 464-'31
train enters the approach section“`
For movements- from; a side track: to the mairr
track over a. hand throw switch, authority toire:-v
move=the padlock' must bek obtained from thev cen.-`
tral oñice operator. If' the block is unoccupieda
andthe authority isgranted, Vhe will reverse the»,
switch lock lever ä-«lSW or SSW for the b1ock„
and will then press the associated starting; but
ton, thereby transmitting> control.l codesby which:
the` tra-nic- sti‘ck. relays are. reversed. at bothends
of the. block. When both trañic relays are re.-v
leverfis displaced from its normal position. Each. _
versed‘, the removal of.. padlock.' Fill; by the train`
hand throw switchisalso` provided with the usual
switch 4circuit controller having a. pointA detector
contact: N which is closed only when the switch.
is locked normal, which, contact is. included. in
' crew releasesthe indication relayWLP and there-_1
the: circuit for its indication relay. .
by places the` ycorresponding lock. magnet. WL 'unl-1
der the control of the. signal line relayfRHD orNV
I_«I-IDwhen the switch is’neartheïend:ci"the'block,.«
. '
as. illustrated
âWL»,V or-under
by thethecircuits
auxiliary line:y
Relay SWLP has front contacts aand c inthe 40
relays;A such; as relays. äzWAR and SI‘ZAR'y when the» V
signal line circuit extending to the left. over line
switch is at an intermediate point, as illustra-ted
wires 35 and 35, and front contacts IJ and d inthe
onerextending tothe‘right over linewires 3.3. andA
by the' circuits' for magnets ñAWL and îrBwl-l;
34, as hereinbefore pointedout, by means of which .
thereby permitting the lock to be released ati once the proper trailic conditions.
Having. now described'. the various elements o@
the“ system of my invention, Ifshall now describe
the signals 22 and 23 governing approaching-
trains are held~ at stop unless switches SAW and.
5BW are properly locked in the normal. position.
The similar relay 1WLP, Fig. 2E?, has. front con
tactsb-y and cl` in the signal linecircuit extending`
to theleft over' line, wires 3|Á and. 32 controlling;>
signal 24, and contact c, Fig. 2F, in the circuiti
for the. route» relays for signals dLA‘and 4LB,
whichsignals govern movements over switch 1W,
andrelay SiWLP,- Fig'. 2F„has similar; contacts. in
the-circuits controlling signals 4R and. 2L govern.->
ing movements over switch 9W».
For movements from` the main track to a side
track over a handthrow switch, a circuit for en
its operation under: difieren-t conditions.
I shall. ñ-rst assume that the> system is in. the
conditionl shown in» the drawings; setup for-«title-y
left-tœright. trafñ'c direction with the’ftrack-guná»
»occupiedt and all; head. block signals at stop.
To: clear the» entering head» block sign-a1 2BA
fcrthe single track block, the operator íirstmoves.y
Ch ' lever'y 'òSGfto its rightfhand; reverse-position, com#
pleti-ng a» circuit from terminal B at the iront
Contact; cof relay ARAK, Fig; IA, over front: conF
tact >e‘ of- .relay ZLAK, hack contacts» d et relaysA
ETI-‘K andl 2l'~\’,ï«îfl'.{,` wire 54:, back: coi-itactsy b. oiA re»
ergizing the lock magnet isprepared automatical
ly by the operation of time measuring apparatusl (Lil lays ¿ELI-Ils'.> and BTK, wire 5.2, contact cof lever
ZSG through the upper lwinding of relay Z-ALP
conflprising> a thermal. relay- such', as.Y 5TE„ Eig.. 22),',
together with a stick relay 5TES and a checking;
relay STEP; This apparatus functions so as to
maintain the switch locked during the passage
to terminal C, energizingL relay 2.-4LP in the re
verse direction', asy shown'. Lampl EFE. is lighted
over the circuit extendingA from terminal @Bf atf
of a high speed. train, while enabling the crew ” contact c. of relay Z-RFK andthe reversecontact- '
d .of`~ relay Z-¿lLP through lamp. EFE to. termi
of a` train vstanding onv the main track` at. the:
Vswitch to release the electric` lock, provided the.
nal C..
The, operator then presses, button ESTE. which
trainapproachesthe switch at a greatly reduced
with the leftrto-Tight trai’iic direction already set
speed and. occupies the approach sectionv for at.
up, as shown, energiz‘es relay4 !STonl'y„transmitleast the measured» length of time. This ap
ting a controlßcode to Station No'. I' by'which're‘
paratus isset into operation by energizing the
lays Oi'S’ and’. ID are energized; so that the Code
checking> relay such. as relay 5TEP over a cir
controlled relays ZRFS and' ZLHS, Fig'. 2A,_ are
cuit including a front contact e of the associated.
indication; relay EWLP and back contacts b‘of-'r-e
laysäTE.` and ETES; and completed upon the re--v
energized normal; their respective channels 2`and;
- 5 being open, and relay ZRHSl is operated' to re
verse’due to energy being supplied from termi?
~ nal B to channel lover contact d o'f` relayOIS
and the right-hand contact a of lever ZSG. Re- /
ISW, moves lever- 2SG to the right and then press-v
es button ISTB to transmit a control code to Sta
lay IWIS will be operated to normal over chan
nel I, and >also relay IWS, provided 'switch' IW
'is not locked. Relay ELFS is energized in the re Y,
verse direction due to the supply of energy yfrom
terminal B at the reverse contact c of relay
4"--2LP of the adjoining 'panel at the: left,l over
wire 53 and Contact c of relay OI S to channel 4. 10
In response to the reversal of relay ZRHS by this '
code, relay ZGR, Fig. 2A, becomes energized in
rthe reverse direction over the circuit »extending
from terminal B at the normal contact a of relay
~ To clear signal 2RB, the operator reverses'lever
tion No. I. The operationof lever‘ZSG energizes:
relay 2-4LP in thevreverse direction as in the
preceding example, but in the code Ynow trans
mitted, channel I is open, and channel 3Yclosed'
over the reverse contact a of lever ISW, reversing'
relays IWIS andV IWS. The closing of the reverse
contacts a and b of relay >I WS, Fig. 2B, initiates
the operation of switch IW to reverse'and the'V
reversal 0f contact d of relay IWS releases relay
INWP and preparesa `circuit for‘frelay IRWP,`
which relay becomes energized when switch 'IW-isZLI-IS over the reverse contact b of relay ZRHS, 15 fully reversed. Channels 2 and 5 are open, and
ynormal contacts c of relays IWIS and IWS
channels è and'ï closed, as in the preceding ex
through relay ZGR and over the reverse contact
ample. Relay ZRHS reverses, and 'relay ZGR;
dof relay ZRHS and the normal contact b of
_ becomes energized in the reverse direction over'y
relay ZLHS to terminal C. Relay ZGR completes '
the reversecontacts c of relays IWIS and.k IWS,I
its stick circuit, and also'closes its right-hand 20 but relay 2RM-I remains released because its cir
polar contact c which completes a circuit for the
route relay ZRAH, extending from terminal B at
cuit is open at the front contact a of relay INWP.
Relay yL'RBi-I becomes energized When relay
front contact a of relay ITR, Fig. 2A, over `wire
I RWP picks up over a branch of the circuit for
1|,.contacts c of relays ZATES and ZBTES, con
relay 2RAH already traced, extending from back
tacts b and c of relay ZGR, contact'd of relay 25 contact a of relay , INWP over front contact a of
2LAS,Ycontact a'of relay ZRHDVback contact a
relay IRWP, back Contact d of relay 2RAH and
ofr relay IRWP and front contact a of relay
back contact a of lrelay ZRAPC' thro ugh relay
INWP, back/contact d of relay 2RBH through
2RBH to terminal C.
relay ZRAH to terminal C.
Relay ERBI-I lpicks up, Vopening .its contact c
Relay ZRAH picks up, and .by opening its con 30 to release relay 2RAS, which releases relay ILR
tact c releases the approach locking relay ZRAS,
to lock relay IWS andV switch machine ISM in
which in turn by opening its contact b, Fig.> 2A,
the reverse position and to'compl'ete a circuit'ove?y
releases the switch locking relay ILR, thereby
wires l5 and 16 at the frontfcontacts a Vand boi?Y ¿
locking relay IWS and the switch machinev ISM
.relayERBH to energize mechanism ZRBG in"the,_
in th'e‘normal position and completing the circuit
normal or reverse directioncorrespondingA tothe
for mechanism' 'ZRAG extendingrfrom terminal
B'over contacts a of relays ZATEP .and ZBTEP,
vcontact c Vof relay ILR, contact e of relay ZRAS,
reverse contact ‘b ofV relay ZRHD, front contact
a of relay ZRAH, wire -I2, mechanism ZRAG, wire
13,1front contact b ofvrelay ZRAH to'terminaLC
over the reverse contact d oi’relay- ZRHD, thereby
energizing mechanism 2RAG in the reverse di
j '
vWhen mechanism ZRAG becomes energized, its
circuit controller contacts shift to energize the
pole changer relay ZRAPC, and to disconnect ter
position of relay ZRHD, disconnectingfterminal
B from wire 'I4 to release’relay ZRGP to initiate
an indication code as inthe caseof signalvZRA
above described. Signal VZRB becomesV lighted
upon the closing of backcontact d of relay ZRBTR
when an'approa'ching train enters section ZRBT.
I shall next assume'that the operator desires
to clear the leaving signal 4R at the vright-hand
end of the block, to permit the rtrain to pass
through the double track stretchat the right.
' For a> movement over the main track, the opera
tor will move lever ASG to the right, with` lever
minal B from wire 'I4 to release the signal indi
3SWV normal, and pressv the starting- button ZSTB.'
cation relay ZRGP. Relay ZRAPC reverses the
Lever @SG inV its right-hand position completes a'
polarity of the current supplied to the line wires
circuit from terminal B at the front contact e
39'and dûjthereby reversing >relay llRHD,V if en
of relay ERAK, Fig. 1B, overv back contacts d of`
ergized, and conditioning the next signal 4R`in
relays STK and llRHK, wire BI, back contactsb> =
the rear of »signal ZRA to indicate proceed, pro
of relays 2LHK and ITK, Wire 62,"contacts b of
vided switch 3W is normal. Relay ZRGP', by're
levers SSW and âSG through the upper WindingV
leasing, kinitiates an indication which
Vof relay y4,-'2LP to terminal C, energizing relay
"channel I5 is energized over itsrback> contact c
4%2LP reverse, as shown.
f With the left-to-ri'ght trahie dir ection already
to pick up relay ZRHK, Fig. 1A, and relay ZRHK,
set up, as sho-wn, the operation of button ZSTB'
by closing its front contact c, lights lamp ZRE to
indicate that signal 2RA has been cleared, and by
energizes relay 2ST only, transmitting a control
opening its back contact d locks relay 2--4LP re 60 code to Station No. 2 in which channel I is ener
gized over contacts a of lever SSW and relay 02S,
When the train approaching signal ZRA from
the left enters the approach section 4LAT, Fig.
2F,` relay IILATR releases to open the line circuit
including wires 39 and 40, releasing relays IIRHD,
4LAER and relay ZRAER and also the repeating
channel ‘2 is energized over contact b of relay 02S, `
wire 63 and the reverse contacte of relay 2-4LP, Y
channels 3, 4 and 5 are open and channel 'I en- Y
ergized over contact a of lever 4SG and contact
d of relay 02S, so that relays 3WIS,¿3WS, >4RFS
relays IILAAR and ZRAAR, thereby lighting lamp
and @LHS are operated to` normal and relays
2RAE to cause signal 2RA to display its proceed
êLFS'and ¿RHS to reverse. Relay ¿RHS ener-Ã
indication, also lighting lamp dLAE to cause the 70 gizes relay 4GB, reverse, and relay AGR completes
a circuit for the route relay IIRH, Fig.'2F, extend
opposing signal v‘lLA .to display astop indication.
IV shall next assume that the apparatus has been
restored tothe conditionshown‘in the drawings ,
« and that the operator Wishes to clear signal ZRB
in place of signal 2RA. Y
ing from terminal B at contact a of relay STR, Fig. Y
2E, over wire BI, contacts c of reIaysfIATES and
ABTES, contacts b and c of relay IIGR, contactd
of relayÃLAS, front contact c of relayBNWP, con
tact c of relay 9WLP,_contact a of relay 4RI-ID, i
backscont’actJe mf frelay 3RWPFthroughïrelay fllRà-I-Iz.
lightsf ITKE, BKEfand STKE; rel'ayr' 2-4LP 'being .
to ‘terminalJCL - RelayARHibecomesleriergized andv I
held~1-deenergiz'ed1"ir1‘ -it’s reverse>< position ' by the
opens its“ -backil contact-cv to re1ease-= rela'yr 4RÍAS î
Which initur-n releases relay SERfto lockïïrelay SWS:î
and the switchïmachin'e SSM normal'.` Relay ‘IRD i
trainlthrough the main 'track ofthe double track!
release of -the indicationrelays'> whichV control
portion is> indicated byß'the lighting of'lamps
alsov becomes: energized; ` over '.th'eireverse «contactl
b ofv :relay
Similarly, the movement - of“ the
3TKE, _ZRAE and ITKE controlled by the indi-è ‘
vprovided ïith’e'neXtäsig-n'a'l-cinx 'ad'-V4~
cation lfrelays Vwhich hold» relay’ 4-.-2LPJ reversed,
While if v‘the train enters the side track lamp ’GLAE *i
vance is» energized,-~ this signal-fcorrespondingrtoT
signal "ZR'A‘as . hereinbefore-r pointed»` out.'- When
relay SLR, releases; theclosing1 'off itsf contacte? 10 is lighted ` in‘- place of slamp' ‘ 2R`AE.í`
I shall now describe the yoperation of the sysL
completes ’a circuit for-‘mechanism 4RGïfromter
temhunderl conditions involving'Y the reversal of `
minaluB" over-contacts a‘of. relays dAT-EPll and
thetrafiic-ï direction, assumingfa‘s before that the '
4BTEP, contact c of AîÍrelayf3LR‘, contacte of re'layrk
apparatus-'isset up -for-the leitete-right direction
4RAS, extending- through' mechanism» âRìG’î to ~
withy 'the ` rbflock'zunoccupied' andv> al1 lfieadfîbloclrl~~
terminal C over contacts a and b of relays~»4-R;D"ï
andARI-Il andiwires '8lr and 885
’I‘he mechanism' IIRGïbecomesenergized?normalf "
or reverselto correspond with the' position.of'~'ïre'-lay IIR'HD, energizing relay ßllR'AP'Cî over vcontact f
dfiofïrelay 3NWP, and' disconnectirr'gf»terminaliB-`- '
from Wire -Bltïtourelease the indication>relayJ4RGPî '
38W normal, and »then \ presses the starting but“y
completes ‘alcir'cuit‘ 'from`- terminal B at> front con»
tact eoffrelay. '4RAK,YFi`gf.'1A`; over front-,ContactY`
suppliedf over line"'wiresll3l and '132 tof-mechanism'
e loff relay' ZLAK "and-ï back;ï contacts
MG; which accordingly `<reverses-Itocondition the f
next sif,f-r~1a,l~i."ll,A in the rear: of' signallßRgïtoß indi-‘if
cate proceed.
signalslat stop'.v
To’ 'clearf the ‘entering head block signal llLAfor'v
theï'sìngleïtrack block-under this conditiongv the
operator moves lever 4SG to the left, with lever
of frelays
« ITK? and î'ZRHK, wire" 5I ," \ contacts ' b--loffy I relays Y
Relay» ßR'GP'up‘o‘n >rele‘asingäinii- i
tiates. an' indic'zation-fcode` energizirfigY ‘channel `I 5ï-`at
its 'contact’cI to 'piclrlupv relay! llRHKf’fFi’g. ‘1B’g
therebylightinglamp A¿lREi The» opening çoîhback
relays `ZIÈAKS
‘at’l andL
its ' right-han
lopeni'ng ‘~ the
-' Stick "
When the-»train approachingl from' they left'l
enters-the single i track blcì'clä,l tlieI -release‘iof re'-' -f
lay ITR opens the circuit `rinclufdiiïig'ïline fw'i?efsif
31 and 38T; releasing th’eseries lightingßrelay ZZER
b'g» causingv> ` relay LZRFKï toîï release' after ï'a' short 3'
time ‘tc?ïpreparefnew1stick-:'circnitsboveri its flcaeláâl
Contact " dïfor; ' lfiolrälinggf'frel'ays‘~ '
and 4RIA`l€Èvî
energized: 'whenëithese ilrelays yare next; picked iup'
over `cl'i'anïn’el'iv12.3l RelaYfIZ'ï-ÁLP is nowf’fre’e'fftô»
be operated back and forth at the will offî'tljielA
operatorj" by? closing- contacts cfofflevers'í‘Z'SG
and ¿SSG '.'alternately;' diïeïtó the" connection ‘ of -
comes lighted to indicate caution or‘~proceed}`when
the 'train enterssectionf` 24T-"to openithe icireuit'ï 4
Wires 52 'and-51 ¿to terminali-Hoverback’contacts'
e- of relaysî2I1l`AK,„äLFKïand'iZRFK.l They oper#y
atomsÁ therefore fnowrfable'r tö'rirestoref'tne original
lease relays ISRAER ’and ÄR'AAR'Í
maherepea'ted ¿attempts‘ëto reverse the` tr’a'flîc"
direction ïof traino,Vvl or?
side track; the» operatorY reverses lever'` 35W,"
moves lever'ASG to the rightfand thenpressesß‘
button" 2STB"13O transmita* '00de'Í ín "Whïítlil’r’'Only-A `
channels 2,` 3` 'and "1* 'are -' energized‘reversingl‘ 're-‘
lays»4l_'.1ï‘S,"3WIS,"3WS andfßR'î-I@4 RelayfllGR `
becomes energized reverse," but' .rela’y'SNW‘P' is"
released by’relay BWSÍ to preventfth‘elenergization'T
ofl relays'îdRH‘and VllP„D""cWer the @route*circuiti4
previously traced; relay 4RI-I‘being ‘vpicked‘upïlby‘ >
relay`f'3RWPf» when: switchl 3Wí isÍ` fully f reversed”
ith‘e'î-ï case of-` a vfault,~to-
direction, >if? heîïso' de'sire's.-k Assuming that‘ïthe '
left-hand contacts' ofi-relay" ZLALP 'rem'ainiclosed",Í
relay ZST‘- becomes energizedin responsefto the
operation .of 'button' 'T
to i transmit" a, control i,
code’tofStationf'N’o‘. 2
and 5 are energized to operate relays SWIS," 3WS§'
4I1FS `f'a,nd`-"¢IR,I-IS` ëlto normal; and-'to' reverse r`relay '
Atîthefsam‘e ti‘me'fre‘lay ’I ST becomes en'
ergiz'ed' .'irr‘» response" `to î this ‘îoperati‘on'f of f button?
ZSTB over "a circuitv extending S` from :terminal l B“v~
over the bïr'anch'- circuit including 'b'ack contact e ‘
at the ‘leftëhand 4Contact?) of 'relay >Zi-IILP, VWire'-`
ofA relay‘SNWP‘andëfront‘contact e offrela'y 3RWP`
Wl'iich‘circuit'l is independent *of* the positionof
relay‘ARHD." Relay ARD «remains released, and”
of relay "5l-TWP; contactsf of"relays`2R^FK-` and”
and‘ï3LRfto block' 'relay‘lë‘WS Tand' 'switch machine '
35M. reversed >and 'to "completev ai-circuit' over Wires`
channel' 2 ~is'îV energized overîthe left' -ëhan'dvr ‘contact
c of Trelay'l ‘2-"-4ILP," tocre'verse" relay :ZRFS
At Station No," 2'the restoration oi'relay '4LF`Sf'
mal'directión te irldicate‘cauti‘oni
tomormal‘: disconnects V'terminals B and ' C"A from.V '
5`6‘;zconta;ct"‘c”of >button ZSTB, Wire» 51, contact Tdi"
4LFK'throughfrelay ‘IST to terminal C', to=`tr`ans€
the operation of‘relay dRl-I'ïreleases relays ÃRAS" (50 'mit-` a . second.“ code ¿to? Station No.1V l, in 'which
RíëlayIRAPC '
remains rele'asedf'î because contact dfî‘of‘ relay`~
SNWP’» in fitsï circuit isïfopen, consequently the
next' signalfïZllï 'inl the> rear is Valso- conditioned l‘to
indicate caution;
It »is‘ deemed unnecessaryftoy traceßtlie‘move-l
ment'of the train step by step through' the `succes
the `,rigl'lt'll'rand''end of .fthe yreversible-line circuit' Í
system~ and` connects’ relay 4LHD'tothe line vvir'es>>VY
3| and 32', releasing"mechanisml 24G‘fan`d frelay‘
MPC.l Relay'24`P`C‘shift's the connections of line
Wires` 35"and"36'from terminals fB'L and C' ofthe
adjacent "source to the 'Winding'7 of -'mechanism y
sive tblock sectionsjinview of theldescriptionof "
ESG; releasing> mechanism ' 22Gr` and "relay ZZP'C.
the various- elements of ‘thesyste'm’already pre--v
sage’ of fthe train l'through the-single“ track blockvv
Relay 22_PC ‘shifts the'connections of `line Wires
S'I‘and 38 from term-inals?B/and'Cof îthe‘source
at its“ location tothe Winding of >'mechanism 2 IG?
is »indiêatedfbytli'e lighting -of’ßthe track~`di`agraml f
‘ and ~the îopera‘tión of relay -ZRF'S‘Étofnormal shifts f
sented.` It is to be Ynoted,lh‘ovvever, that the pas'-y ~
the connections of wires 31 and 33 from relay
channel 2 as well, assuming the left-hand con-` '
ZRI-ID to terminals B and C of the source at Sta
tacts of relay 2_4LP to be closed, so thatrelays
IWIS, IWS, rZLFS and 4¿RHS are energized nor
mal and relays ZRFS andl 2LI-IS are energized
tion No. I, thereby energizing the line circuit sys
tem at its left-hand end to condition signal ZI
to indicate caution and signal 23 to indicate pro
ceed,> and to energize relay, ¿LI-ID in theV reverse
4The approach relays ZLAR and GRAB, remain
energized, being controlled over separate line
circuits, and since the coding system is arranged `
to transmit indication codes following the two
control codes, as already mentioned, relays lZL'AK
, reverse._ At the same time, relay 2ST of the
adjoining panel at the left is energized over the
circuit from terminal B at the left-hand contact
b of relayA-ZLP, Wire 6B, contacts c of lever-v
ISW and of button I STB, Wire yIi'I, contact 'd of
relay SLP, contacts f of relays 2LFK and ÃRFK
through relay 2ST to terminal C, to transmit ;a
secondV code to StationvNo. 2 at the left-hand end `
and 4RAK are'reenergized over channel I2` by
ofthe block in which channel 4 is energized over
indication codes transmitted from Stations No. I
the left-hand contact c of relay ¿l-ZLP to reverse
and No. 2, respectively, completing a -circuit over 15 relay 4RFS.
their front contacts b to pick up relay 4LFK to
At station No. l, the restoration of relay :LFS v
' prevent the response of relay. IST to subsequent
to normal disconnects terminals B and C from
operations of button ,2STB, and to light lamp
the right-hand end of the line circuit including
the line wires 39 and 40 and connects relay ZLHD
Relay AGR becomes energized in the normal
`direction- in response to the reversal of relay
4LHS, and completes local circuits -for clearing
signal 4LA similar to those for. signal 2RA al- ,
ready traced, as will be apparent from the draw
thereto, releasing relays 4RHD and the lighting
relays in series therewith. Theoperation of re
lay 4RFS to reverse shifts the connections of Y
wires 39 and 40 from relay 4RHD to'terminal
C_ at back contact vb of relay IILAPC, and to ter
ings. To clear signal 4LB when the left-t'o-rightV 25 minal B'at `contact d of relay 3RWP so> that re
direction is set up, the block unoccupied and the
layY 2LHD becomesV energized in the normal di
~ head`V block signals `at stop, the operator reverses>I
rection» and the lighting relays inits circuit be
lever 3SW, moves lever-ASG _to the left and presses -
come energized,V relay 'ZRAER' energizing relay ` I
Vbutton 2STB, Vresulting in a reversal of trafiicïdi
rection as described in- connection withl signal
No. I in which channel I4 is energized to pick
y IILA, and in the operation of switch 3W to re
ZRAAR to initiate an'indication code at Station
up relay ZRAK. Relay ZLFK, Fig. 1B, becomes
verse and the energization `of mechanism ALBG
energized over contact b of relay ZRAK to pre
in the normal direction to condition signal 4LB
vent the response of relay 2ST to subsequent 0D
to indicate caution, over circuits similar to those
eration of buttonrlSTBff
already described- in connection with the corre 35
Relay yZGR becomes energized in the normal
sponding signal ,2RB, consequently a step by step
, description 'of these operations is deemed unnec-»
direction in response to the reversal of relay -
2LHS and completes local circuits for condition
ing signal 2L to indicate caution, similar to those
already described in connection with the corre
vConsidering now the apparatus for thev double
track stretch under conditions involving reversal 40 sponding signal 4R.
of the traiiic direction, it will be assumed that
Assuming next that the train -rnoving fromv
signal 2L is to be cleared with switch IW nor
right to left is to take the siding and that the
' mal, for a train approaching from the right and
one-moving from left to right is'to pass- on the
that signal 4R has been cleared with switch 3W
main track, and that the line relay 4RHD con
reversed for a train lapproaching from the leftV i trolling signal IIR is energized over the circuit
which is to enter the siding to permit the op#
Y extending to terminal B over contacts c of re
posing train to pass on the main track.
lays ITP and ZLAS, in Fig. 2A. Ifv the operator
To clear signal 2L, assuming sections IT; ZRAT
now reverses lever ISW and moves leverv ZSG
and 4LAT to be unoccupied With the left-to-right
to the left, the circuit traced above including wires traffic ~`direction set up as shown, the operator`
6I and E4 and contact b of lever 2SG for operat- '
moves lever ZSG to the left with lever I SW nor
mal and presses button ISTB. Since switch 3W
stands reversed, its reverse indication relay SRWK
is »now energized, fand the closing of contact b «
of lever ZSG completes a circuit from terminal
B at front lcontact e of relay ZRAK, Fig. 1B, over
front contact d of relay 3RWK, wire 6I, back
contacts b of relays ZLHK and ITK, contacts b
of levers ISW and 2SG,‘Wire 64 through the lower
Winding Vof relay 4-2LP to terminal C. Relay 60
4-2LP closes its left-hand contacts, disconnectf
ing terminal B at its contact cl from wire I55'to`
release relay 2RAK.~ The opening of the right
hand contact b of relay 4-2LP deenergizes re
lay 4RFK, .which relay releases rafter a brief pe-v
riod. Relay d-ZLP is now free to be operated
' back and forth at the will ofthe operator like
relay 2-4LP under similarconditions, but as
suming that the left-hand contacts of relay
4-2LP remain closed, relay IST becomes ener
gized in response to the operation of button I STB
to transmit a control code to Station No, i at
the right-hand end of the block in which chan
nels I and 5 are energized over the left-hand con-.
tacts a of levers ISW and 2SC, respectivelyg> and
ing relay 4-2LP to its left-hand position is open -
at contact b of lever ISW,-and if'signal 4R has
been cleared, also at contact d of relay 4RHK.
relay 4-2LP remains reversed and relay ¿RFK
remains energized and the circuit includingwires
B6 and 61 by Which'button> ISTB controls relay
2ST is held open at contact b of relay 4----2LP,
at contact c of lever I SW, and at contact f of
relay dRFK.
Under the Yconditions described,
therefore, the operation of button ISTB results
in the transmission of a code «to Station No. I
only, this being sufñcient to eiïect the clearing of
signal 2L for a movement into the side track by
the operation of circuits similar to those already
traced in detail for the opposing signal 4R..
Returning now to a consideration of the single
track block, and assuming the apparatus tobe
set up for the rlght-to-left direction .withY the
`track unoccupied and all head block signals at
stop when the operator moves lever 2SG to the
right and presses the starting button ISTB to
transmit a code to Station No. I, for clearing
signal 2RA or ZRB, as hereinbefore described.
Under these conditions the closing of the right
v hand contact c of lever zSGcornpletes a circuit
over.I wiresgâ lÍ 1ancl.;52 ¿ftoïzoperatexrelay î?llLP tot
reverse; releasingrelay' _llliflFKïsoit-,hatwhen button;
I STB y;is:'_operate'dç.: _a :circuit ’_Will. be 1: closedsfromc-
atjzthefflocation: oniswitcht SAW, `and isgreleased
iifflfie‘rntlie;train‘l crewremoyes padloclnäûuoii'eithen'
switch SAWzf'or; 5BW"bysthe opening ’ofî'tli‘e corg-f
terminal B’ratLthe rightf'handncontact-'b ,ofîjre'laysl
responding::contact;_ i4 9,; and _ the’. 4release ¿of ¿relay
gfrof-:relayeZRFK _andgzdLFIí `Contact- eßoff relay`
S'I‘ER-îand; ETES; over; front, ;, Contact, ai :of relayfj:
SWLB ¿îcomple'tesv‘ new; :stick circuits: vf or ‘f , relays _i
5TEP; extending;A to. terminal :B' at 'backî :Contact:
5;'11'112; Wire :§68 ethrougha'rela‘y: 2ST ; to: :terminal ._
C; :resultingfin :_ the f‘energiz'ation; :offreiayfZST‘itof:
transmit as_control ècodeutof :Station ‘No.f. 2_ì'atsthe
The ¿time _measuring :operation _. therefore con-e
l'íght-handrœndiofïithe ‘_ block_:in which. channel 2‘1‘» 10 tinueszîiffinotfialreaidyl completed;.the: c1'o’sing:_o'fií
contactçgb.foizjrelaytöTEf-at zthe: end :offîits _icoolei
is» ¿energized'i from ¿terminals :ëBf'atithe 1 righté‘h’an'dï@
contact lc aofzrelaysîe-ßLPéoi/fer Wire isß-,îßand‘scone »
tact=1b of-rrelayiOZ‘Sìtoœreverse' relay 4LES12 Rei-_.
ingiperiod zcomplietingy `arrirciiitl fon;_the:_selectedi-
vlock magnet' SAWL yor EBWL over front Contact.:`
b'rof krelay .fE'I'ESLaand-.zcontacts 14 6.-;-4'lj_tlie `circuit '
code to'fStati‘onfNo'.l I at ‘_theßleft-ïhand 'end'ïof the-_í 15 f also: ',includingtimthezcasei ofJ-fmagnetlâ‘AWL; the?
block as in the ñrst example given, restoring-ree»
lay IST„-ïis';a1so1 -operated-_Itoxtransmitïavcontrol?
layiZRFS to normal',v th'ese-relays.»cooperating-l _to
setiY 'up ßthe reversible-aline -»circuit `systenrrfor '--tlieg
le'ftìto-iight i direction yas already fde'scribedg? vfor“l
cuits for vfcle‘aring@y signal 'ZR'A or-:ZRB'I‘
Tli'eflineicircuit `for themainí’track Ilolock ot the ß
doublezt'rack :stretchf-mayzbe similarly„restoredv to fi
thelleft-'ito-right direction by: operating lever >IISG??
toïzthe/Irightiwith"leverY SSW? in 'its normal posi-‘V 25;
tion '_to' «zcomplete-A aA circuit ' over ‘wires y-lì IV and i 6211i
andi contacts :o lof-- these levers to ‘ operate «relay ~
the.l right;
vto energize_and
layvl S'Ii‘fofitlieadjoiningpanel at the right äo'ver» -' 3o "
the~ circuitîincludi'ng: wire f5 8. "
releases th‘e'flock magnet‘to close-contactitlgïand*
padlock 50; j
It?A Will'- be.: understood fth'at ¿the »resultingfindica-y -
tiorr codes/'causefrelay ZRFK‘for-ARFK ’to vbecome
energized',4 interrupting the connectionoverffwire
68 ï' 'orf 58;’ and . that 2th`e<~f starting "button Àfor‘ the --' 35
entrance end of theißblo’ckï'fis" `only-1temporarily'
effective «to» initiäterthe »transmission‘i-of 'codes ' to
» Ii Asha-ll -'now-J describe» »the "operation'o? the vsys
tem under-»'fconditiòns »involvingÀ the »operation ofAf 40
the hand throwsW-itch‘es; assuming‘that'the-apf
paratus-"isv sctfíiupefor -‘the '-lefftïto-'righ‘t direction
ofítrañicfmovement'» as shown.l
Assuming fir'stfthat «a train isapproaching sig-3
over = switch" SAW or ‘Y EBWi ' Whenfv theeapproachä'
ing itr‘aiifl.#entersl section- 22, the release off- the'
trackïrelayl 22TH; completes a~circuitfmomentarily‘l'
fromÀ terminal B‘at its 'back`A contact e 'over‘front‘
therebyreerrergizes-.the = indication relay E5WLP’to ~
c1ear.:signai f22fforathefollowing trainçï.
` '5 '
The ¿time` 'measuring - apparatus associated with` ‘
switchesilW :and19W?’functions:similarlyI Vthat for' ‘
switch ‘IWf‘beingisetfinto operation‘when a train“
enters «section ARAT 'OrcST?‘and "that *for 'switch' f
wh'enatrain enters *section‘ALATg’
aside track-¿to the main"
must“, request
7'a ithè>
throw i' switch,
by telephone
‘Y the -'train-».fcrew
Wiseetoiauthorizefthe _imovem'entìY Iff'trafñc 'conaf
ditions -faredavorable‘ì andùthe «operatorl consents -1
toîfassmovement'" from :_aaf side“- 'track loverfa f“ hand
throw isW-it‘ch) into'l‘ith'eisingle ltraclrî'block? he Will-f’
roven eleven-'i S-e-TSWZ and .pre‘ssifbuttom lS'I‘BîVIA
lAîè thereby@ energizing H relay
' ‘öl-1li?? and y"
completing» 'ai circuit'ffrorn _terminali Bi Tat -Contact f
contact/'a l»offrelay 22PC_ throughÀ relay;;22SRfîto~50
terminal-2C sowthat relayf‘22SR picks ~up,;„est_ab'lishin'g 'a -sticlr‘circuit' at lLitsown front contacta;
The-opening n'of “ifront- contacts aV and vc "ofrrel ay i
Withirelayr'l ST," resulting: ir'rlfthe7 transmission - ofE
acoontrolif'code tc‘wStation.l NCL: lï'at the left-hand*
enda'oiìz-_theifbl’ockîin'iwlfiichï-channel?.'isf energized
22i'I'R'á-‘causes the frepeatingf'relay‘~ 22~’I'P,’Fi'g,„_A 2D; yover
tlreàcircnit exten'ding-»frornfterminal Bß‘over-v
tal-release yand to open atsweontacts a» andremo S55»
release relay rSARÍ’at- the locatiorr'of` switch'ìEBW', '
thereby completing a circuitk from- terminal'B" at
front >Contact e of lfrelay-~~5WI.|P„’overbaclïcontact
c of 'relay' 5AR`fand‘back-'contacts‘b of `'relays STE '
and STES through relay 5TEP to _terminaliÍCl' 60
Relay"4 5TEP‘» becomes 1 energized. -` to complete _ a
channel _2 ‘_:isyenergized: over contact ¿croi ï relay f' '
stick circuit at,_its` ovm ‘front YContact.` b` and„;to__.
5-1LP, Wire 59, contact e of lei/erJSGiandßoon'- »
tact ’ bfof ‘relay I02Sîtol `reverse. relay»V 4LFS.‘»- Con
STES*' its
At" contact
th‘e iend _c‘of>to>a energize
the ,_thermalïrela'y
ta'ct 'c_fof..ftheßdirectional «îreläjy >2il`-4LP providesafvv
second: connectionrsto 'channel 2 ‘iat g one panel` or"
gize~relay~f5TES, which‘ picks iupl ,and j_comple'ítes,_
a _stick circuit at its own frontïcontactla__com
prising Ia'loi‘anch of ~th'e circuitïor re1a`y.,5TEP.__
Relay STE is deenergized bytheopeningfof.back-
the other over which the traiïic relay at the exit@
endilo?rthe _a block;y as indicated» ¿by-fthe position-'of
relayi=-2î^-4LP;,="’haswalreadyr been»l reversed,` l «Ttief
circuits-l1 establishedzf‘hy- I the -‘- switch lock' ‘f lever-'f
contact vc of _relay lSTESÍ and returns toits norma1__ 70 therefore»
at :that fend'
= tof‘revers'e‘the
relay =
position, closing,its__contactib1at§the endlof,_ a_
predetermined cooling period. '_
The. switch indication relay SWLB is normally_„
energizedover. aicircuit including, the, 1ine__iwii‘es»_7
4 l'îï'andv '42' from „terminals _Band C_ of_r the sorcejV 75
reversed,;_forî1"e'rther `directioïnf- off'traiìië‘.l .Un'de'rc
this -L condition «signals »2 if fand» -'-2 Mare conditioned-‘ß
tonindicate cautidnfand signals 22'ïand` 23-'arelatfiß
Assuming firstA that the-.train is on mesme.
nal 2| " will indicateV caution an'drsignal 23-will
indicate-proceed, and relay 4LHD will thenbej
track at switch SBW, the release of the indication `
relay SWLP by the train crew'connects relayV
come îenergized, provided the entire block is un
occupied, but signals 4LA and IILBv are held at ’
ïï stop, because the circuit for their route relays?
SWAP. to lline wires 35 and 36 extending ïto the
' left and relay SEAR to line wires 33 and'ï3‘lV ex- `
tending‘to the right, and if the‘entire block’is
unoccupied, andthe 'entering head'iblock signals
lILAI-I and ALBH is open at contact c-of "relay
JWLP. Relay ‘ITES becomes energized overthey
are at stop with their approach'lo'cking `relays
2RAS and ALAS yenergized,'re1ays >SWAR` and
Y circuitfrom terminal B at back contact e of relay
'IWLP, the reverse contact a of relay dLFS', front
l' SEAR pick up to complete a 'pick-'upcircuit :for
-contact f-,of relay 4LAS andy front contactv e of '
relay-STES over their fro'ntcontactsv a, extend- >
relay 4LHD to complete the circuit for lock mag
net'IWL including front contact b of relay .'ITES;
ing to' "terminal B. at*~ back "contact e of - relay i
Contact f of Vrelay ¿ILAS provides approach lock- ‘
.Relay 4S'I'EPpi'cks- up over contact a of relay
STES, completing stick circuits vat its own-,contact
a for holding relays STEP and STES‘energized.
VVSince relay STES Apicks up first, relay STE‘is not _
energized and the circuit for> the lock magnet'
. ing protection' for switch 'IWL corresponding to '
15 that> provided. by contact b of relay 4LAS, *foraI
SBWL, which'in this instance extends from `ter' minalB lat‘backfcontacte of relay- SWLP over
` front contacts a and b of relay STEP, back con
'I‘helock for switch SBW or .SAW may also'. be
double track block over a hand throw switch
such as 9W, the operator reverses lever SSW to
energize relay SLP, and presses the startingzbut
25 ton 2STB, completing a, circuit over contact Vb' of;
through section 23T.into'section 24T,`ïin which
switch 1W may be unlocked in the rea-r oI a train»
which has passed signal 23 to energize relay 23SR '
For a movement into the main track of the -
V released vfollowing the passage of 'a through ‘train
When the right-to-left ` direction Ais set- up,
' or 23PC, as will be readily seen.
tact b of relay‘STE, front contact b oi’` relay STES `
and contacts' ‘3S-41,' is completed when relay
STEP picks up sothat the lock may: be releasedV
switch 3W.
, buttOnZSTB, contact c of relay SLP and wire S8
to pick up relay IST of the adjoining panel _at the f
right, along »with relay 2ST, to transmit lcodes to1
case relayV 24SRpicksup _when the through‘train
both ends of the main track block t0 energize
passes signal.24 to-'supplycurrent to lineâwires 30 relays 4RFS and ZLF‘SY reverse, and when lever
33' and 34,' thereby energizing relay SEAR as soon>V
SSW Yis subsequently restored to normal, relay
as the' train` vacates jsection-l 23T, relay i SWAR i
SLP is held energized overa stick circuit including
being energized as in the> preceding example.
wire 'I0 until 'a second code is Vtransmitted to set
When the vtrain movement> fromthe sidetrack»
tothe main line via switch SBW is completed and ,
the ~operator hasbeen advised by the train crewthat the switch is again locked normal so‘as tol
reenergize relay SWLP, he restores lever S-"ISW
to Vnormal and presses button I STB. ¿Relay
S-‘ILP isheld energized overa stick circuit in
cluding its contact a and extending to terminal
B> at back contact F 0f relay IST and also over
wire 60 to terminal B at back contact e of relay
f up the traiîic direction corresponding tothe posi
_tion of relay 4-2LP,-these operations being simi- '
lar to those already described.v
- -
, `
. When relay-SWLP is released by the train crew,
the dropping of its contacts b and d causes relay
4RHD to become energized, provided the portion
of the main track block to the right -of section 3T
isy unoccupied, signal 4R, being held at stop, 'if ‘
switch 3W is normal, by the opening of contacte =
of relay SWLP in th'e circuit for its route relay
2ST, maintaining the circuit for relay »2ST in
¿IRI-I. If section 3T at the left-hand end of the
cluding wire-68 and front contact e of relay 45 block is also unoccupied, or switch 3W reversed,
S-‘ILP, available. only until relays IST and 2ST
'are both energizedin response to the operation
of button ISTB, whereupon relay S-TLP is re
leased. This' operation is eiîective therefore to
transmit codesto both stations vbut since relay 60
S-'ILP releases before' they are transmitted,
channel 2 is energized in the code transmitted
tothe exit end of the block only, according to ,
the energization of, relay IIRHD completes a vcir
cuit for relay STES` extending from terminal B
at back contact e of relay 9WLP over the reverse
contact a of relay 4RFS and over contacts f of
relays v¿SRAS and relay 3TR or over contact g of
relay SRWP, and contact d of relay 4RI-ID, and
relay STES then picks up to prepare the cireuit‘
for magnetQWL. Contact f of relay‘dRAS pro
vides approach locking protection following the
the position of relay `2-4LP, and thereby restores
the line circuits -to `their normal condition.
55 return of'signaNR manuallyto stop after ,having
When the train which entered 'the block‘via
switch SBW reversed passes signal 24 at clear or
caution, relay 24SR picksup to supply current to
beenvcleared, with switch 3W normal.
It will be seen that in each diiïerent arrange
ment shown, the lock magnet circuit is completed
the line circuit in the rear to condition signal 22
only when the trañic relays are reversed at both
to indicate caution and to permit the entering
endsof the block.
head block signal to be manually cleared, as will
Although I haveherein shown and described
be readily apparent.
only one formel’ railway traiîic controlling ap
It will also be clear that when the right-to-left
paratus embodying my invention, it is understood
direction is set up, train‘movements similar Vto
that various changes andvmodiiications may be
those just described may be made in that direc 65 made therein within the scope of the appended
claims without departing from the> spirit and
scope of my invention.
. v
>,Assuming now that-the train is on the side
track at switch 1W, Fig. 2E, and that the oper
Having thus described my invention, what» I
ator reverses both'trañic relays ZRFS and 4L~FS
1. `Railway traiiic controllingY apparatus com_
as -above described. When relay 1WLP >is re
leased by the train crew, the dropping oi its con 70 prising, a signal at each end of a stretch of rail
way track for governing trañìc movements into.y
tacts b and d disconnects terminals B and C from
the stretch, a signalV control relay and a trailic
line wires 3l and 32 and connects relay 4LI-ID
relay at each signal location, a system of're
thereto, restoring signals 24 and 22 .to stop, and
claim is:
signal ,circuits controlled jointly by said’
since the operator h'as reversed relay ERES, sig 75 versible
trañic relays in selected posítionsvand by trañìc 'V
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