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Патент USA US2121847

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ä.'hmzß, 193s.
Filed‘July 18, 1936
7 Sheets-Sheet 1
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JuneÍZS, 19.38.
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Filed July 1_8, 193s
'7 sheets-sheet 2
June 28, 1938.
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2,121,847 .
Filed July 18, 1936
7 Sheets-Sheet 3
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June 28, 1938. »
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Filed July 18, 1956
7 Sheets-Sheet 4
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Filed July 18; 1936
7 Sheets-Sheet 5
Junel 28, 1938.
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Filed July 18, 1956
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June 28, 1938.
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Filed July-'18, 193e
7 sheets-sheet ,7 '
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Patented June 28, 1938
Sedgwick N. Wight, Rochester, N. Y.,¿assigncr,tov .
. General _Railway Signal Company,` Rochester,
N. Y.
~' ApplicationvJuly 178;- 1936, Serial No. 9,1;‘322 l
'3o claims! „ (orgie-_134)
initiating or entrance button, the completion orl
This invention relates to interlocking systems exit
button having been only momentarily in an
for railroads, andinore particularly pertainsl to
such an interlocking -system infwhich a minia
Iture track layout in a control oflice has located
#552 thereon the controlling buttons or levers for set'
ting up the desired routes‘through the actual
track layout and in which the electric , circuit
connections between suchbuttons or levers __ac-`
Ycomplish the control of allr the various traffic
controlling devices 4employed for the establish
mentof routes'through the track layout.
, The present invention relates toimprovements v
in the interlocking systems disclosed‘in- my prior
applications Ser. No, 721,696, ñled `April 21, 1934'
'and Ser. No. 69,905 ñled March 20, 1936.
The organization of the system vembodying the
invention ' contemplates a
trackl layout located in thecentral .controloflice
which corresponds to the actual tracklayout in
2O the field andhas located thereon initiatingfand
completing buttons for eachoi the-route deter
mining points on the track layout. yInbther i
words, for each signal location there is ,an in
itiating button, and for the end of each route
there is a completion button. To establish a
movement of trailic in a particular direction over
a particular trackwayjroute, it isnecessary for
the'operator to actuatethe initiating-button at
the entrance to such desired route' andìthen ,ac
3,0. tuate the completion button for the exit `end of
that route.
This contemporaneous operation of an initiat
ing button and acompletion button on'the min
iature track diagram provides for the transmis
sion irofvroute control codes over a multiple im
pulse code type communication system to `the
i iield location so as to compositely operate all ¿of`
the track switches in -such -route to their‘proper
positions after which the 4signal for thatroute
clears to allow the passage >of trañic over the
route providing traffic conditions are safe lfor
The'entrance-exit method‘of control orma
nipulation so characterizes the system of the
present invention, that it has'been aptly termed
entrance-exit interlocking or abbreviated' as
“NX Interlocking”. "
he system of the-present invention also'pro- 'l
Avide's‘that under certain emergency conditions
codes may be transmitted so as to'individually
operate the track switches in Vaccordance: With
the positioning of, their- respective emergency
switch controlA levers, one for each track’switch.
This individual emergency control of the track
switches is accomplished without the clearing
of any,_ signal andwis so organized as to be pre-l
vented'ïif _such switches _are included within` a
cleared route.4
Although, 'the present invention is more par 20
ticularly directed to the features of such'an NXv
-interlocking systemk employing code communi
cation between thel central office and the ñeld
location, it"is to beunderstood that the various
interlocking features involvedin the control of 25
complicated track layouts, such as shown in my
application Ser. No'. 69,905 filed March 20, 1936,
are to be understood 'as applicable tothe system v,
of the present invention.
Other objects,ìpurpo'ses and characteristic fea
tures of ïthe present invention Will be in part
lobvious from the 'accompanyingjdrawings and in
part pointed outas _the description of the inven
In describingthe invention in detail, refer
ence will bey made to the accompanying drzniv-`
ings, in .which like reference characters desig-`
nate „the same parts ,throughout the several
Vi'ewsí> and in which like4 letters in the ‘reference
characters designate similar >functions or rela
tionships with ` the ydistinctiveness' between such
reference characters provided by the use of dis
» It is
also contemplated
f that
.l system
,l .will
tinctive preceding numerals; in which likepre
allow the control code for only >one ofv several
conflicting routes to be transmittedito-the 4iield
ceding vnumerals in the reference characters,
when applied to different letters, represent the
inclusion of -such devices Vwithin-'a particular
location at any one time, so as to prevent any
. conflict of controls at the ñeld location.
> 150':
operated position.' `
' Y
» In accordance with the present invention, the`
preferred form of initiating or entrance button
is of the knob type which 'may be turned-to av
l Figs. 1, 2 and 3 when placed‘side by side illus
trate the circuit arrangement employed in con
particular position in which it remains; while,
for setting up theroute control codes lfor trans
missionV 'over the multiple. `impulse type code
the completion or exit buttons-is of the self
restoring push button type. The >-system organ
ization `then renders a cleared route whollyA de
55: pendenty upon the manualrestoration of vonly the
nection withthe system of the presentinvention
« Figc' 4 ,illustrates certain :parts of the code'
5524 Y
transmitting apparatus employed in the central
Fig. 5 illustrates certain parts of the code
receiving apparatus employed at the iield loca
chine SM, which may be of any suitable type,
such for example as disclosed in the patent to W.
K. Howe, Patent No. 1,466,903, dated September
4, 1923. However, two switch machines may be
employed having either individual or collective
It should be understood that the invention is
location for controlling the individual traffic l not limited, as thus shown, to the control of the
governing device in accordance with the >route cross-over and signals of this chosen track lay
control codes received.
out, but may'be extended for any desired num 10
Instead of showing the complete circuit ar
ber of switches and signals and may be readily
rangement; by placing a large number of sheets' ‘ applied to all types of track layouts found in ln
side by side, a simpliñedmethodoffdisclosure" terlocking plants.
has been employed wherein all of the control
The signals I, 2, 3, 4, 5 and 6 are assumed to
circuits for any one relay' are-shown in a» coni-‘f ‘ bef-color light signals giving the usual indications
tinuous relationship; while » all" of the circuits ofïVg’reen-for clear and red for danger or stop, 15
which that relay may control are distributed be
and if an added' indication is desired, yellow for
tween the several sheets of drawings‘upon .whichç-r cautiom However, these signals may be of
that relay is shown in block form.
the search light type, semaphore type, or any
For the purpose of further simpufying'tirenits;` otherv type> of signal instead of the type chosen
tration and facilitating in the explanation »there
for the embodiment of the present invention.
of, the conventional parts.andcircuitsconstitut
The track layout illustrated in Fig. 7 has been
ing the embodiment of the invention` have <been shown as divided into'track circuit sections I4
shown diagrammatically and certain convention
and I5 by insulated joints indicated in the usual
al illustrations have been employed, the-.draw
manner. These track sections are provided
ings having been. made more with. the idea of withl the usual track batteries and track relays 25
making clear the purpose- andlprinciples `of `the of ‘which only the trackl relays HIT and IST have
present invention together with its» mode. of op
been shown. These normally energized track
eration than with the ideaof illustrating. thespe
circuits are wired in the usual manner to provide
ciiic construction> and arrangement of Apar-'ts Vthat for fouling protection and to provide for the
would probably be employed. in practice.
' Y
insulation of cross-overs and track switches, such
The various relays and their contacts areillus
details of wiring having been omitted for vthe
trated in a conventionalY manner and symbols are sake of simplicity in the disclosure. These track
employed to indicate connectionsv tothe terminals circuits can of course be subdivided or lengthened
of batteries or other suitable sources oiîelectric as desired and arranged in accordance with any
current supply instead of showingall ofthe wir
ofthe usual practices.
ing connections to such terminals.` ,
The track switch TS is shown as having asso
The symbols (-I-) and (-,-) are employedto in
ciated therewith a switch position repeating re
dicate the positive and negative terminals re
lay WP. This relay is of the polar-neutral type
spectively of suitable batteries or other sources and is energized with one polarity or the other in
of electric energy; and those' terminals with accordance with the normal and reverse locked
which these symbols are used are'presume'd to positions ofthe cross-over TS and switch machine
have current flowing Yfrom the V.positive terminal? SM, and is deenergized whenever the cross-over
designated (-|-) to the negative terminaldesig TS is unlocked or is in operation. The polar
nated (~).
ized circuit for controlling such a switch repeat
The symbols employed' with any- one'loc'al îcir'
ing relay is governed through the medium. of a
cint are considered to designatethe' terminals'of point detector contact mechanism as shown for
the same battery or other suitable source, but‘a‘s4 example in the patent to C. S. Bushnell, Patent
many separate sources may be provided as found~- No. `1,517,236,'ñled November 25, 1924.
necessary, or as many sources may be‘combined in
Control pand-In the central office, a control
tion; and
Fig. 6 and 7 when placed side by side illustrate
the decoding apparatus employed at the field
a single source as found‘ nece'ssary'orî‘expedient
in the practice of the invention. If alternating'
current is employed, then these'symbols 'should'
be considered to represent the instantaneous rel
ative polarities of the respective terminals;
machine includes a control panel on which is
located a track diagram corresponding‘to the ac
tual track layout in the ñeld. This track dia
gram is shown as having a miniature cross-over
ts'which- is movable to normal or reverse posi
Where groups of devices are'referredï t'o in a
tions by suitable electro-magnetic means in ac
general Way, such devices will> ‘be1 designatedby
cordance with the position of a switch control re
the letters or precedingV numerals characteristic
lay Z.` A similar miniature track switch has been
shown in detail in my prior application Ser. No.
of such group instead of citingpeach' speciñc ref
60 erence character of that group. _
431,748,Í filed February 27, 1930.
On this control panel are entrance buttons NB' 60
for each of the signal locations, so that entrance
Apparatus in general»
Track layout-Fig.' 7.-'-In the' accompanying
drawings, the invention has been shown applied
buttons INB, 2NB, 4NB, and BNB correspond
respectively to _the signal locations for signals
to a track layout including a stretch~ of double
track connectedv by a cross-over TS; The'
I,’2, 4 and 6L Also, an exit button XB is pro
vided for the end of each route, shown as buttons
stretch of double track includes amain'line‘ex‘
tending from a signal I to a signal 2,- and another'
main line extending from the signal 4 tothe
7.02 signal 6. Signals 3 and 5 govern trañic 'over' the
cross-over TS between the two main line tracks;
Inasmuch as the opposite ends of a cross-over
are usually operated at the same time', the'cross
over is considered as a single track :switchTS andi
iti is illustrated as operated by a singl‘e'switch.~ ma
I XB, ZXB, 4XB and GXB. It is to be understood
that the ends of the routes may or may not cor
respond to the location of the exit buttons on
the miniature track diagram, as a route is usually
considered to extend from one particular signal
to the next signal governing trañîc in the same
direction, or to some arbitrarily chosen point.
Each entrance button‘NB is in the form of a
knob’ which is rotatable from a normal position
to a position where the index or the knob’is in` m
correspondencewith the indicator arrow on‘the
inside of the knob, and Vwhen. such entrancebut
InFig. 4 certain of the relays of Fig.- 3 have
their operatingl circuits shown, such as thestep
ton is so positioned, its associated repeater relay, ping relays ,IV,¢2V, 3V, 4V, 5V, 6V and LV, to
NR is energized throughY circuits directly -con
gether with the impulsing relay E and its re
trolled by contacts operated :by the entrance but
peating relay EP which causes the operation of
tonsNB, indicated .by dotted lines, and all of the stepping relay bank and the impulsing of the
which has been shown- in detail in my prior appli
control line.` circuit including line Wires I0 and I2
cation Ser. No. 69,905, i'lledv March 20, 1936. '
which eXtendLto they i'leld location.
Within ,the entrancebut'tons NB are suitable
10 signal indicators SK shown 4in Fig; 1 as indicators
ISK, 2SK,; -llSK‘ and . GSKLtf-"Aî particular indicator
is derived from the control oflice battery- CB
and is applied in positive or negative impulses
is illuminated when thesignal'at the'correspond
as selected bythe relays PC and NC respectively.> y
ingpsignal location is, cleared, all of whichY >is
The line relay F at the central ofñce is‘re
accomplished through means not shownoin the
present application for thelsake' of4 simplicity'and
peated bythe relays lFP and ZFP for each im- >
pulse; while the relays SA andA A2SA are picked up 15
a 1 more ready understanding of the: present
at> the beginning of each cycle of operation‘and
remain picked up-‘until the end of such cycle of
invention. ‘l
The current
for' supplying >impulses to the control line circuit `
The exit buttons XB are of the .self-restoring i operation due to their slow action, although relay
push button type andf have ¿been connected lto S'Ais only energized during the impulse periods.
pushy button symbols byl'suitable dotted linesso
The stepping relays V-have associated there 20
as to make the relationship-readily apparent.
with a half-step relay VP.
« 1 Also, located on this` control 'signal are suitable
The line wiresl I0 and I2 extend to the field
trackindicators IATKIandÃïIB'I'K‘which are illu- .
locations each of which has a code receiving
minated when the correspondingtrack sections, `apparatus as shown yin Fig. 5, it being under
25 including track relaysfIEILan-diIST, are occupied. stood `that thenother ñeld locations have‘similar 25
Inback'of the miniatureicróss-’over switch points apparatus. But »it is deemed sufficient for an
ts arersuitable .lockf’indicators .LKA and LKB understanding of the -present invention to con
4which are illuminatedâ when -the cross-over ts is v Sider the operation .with respect to only a single
j30 included in a proposed route, aV cleared route, or
~ Route 'reZays--Theff?entrance’ ,button repeater
rialv 'lì'v in both directionsfrouteA relays Á 4--2 'for
controlling trafñc between _thelsign'al 5 and the
irrespective of its polarity, is repeated by the
line repeating relay .FP1 so longasthis iield loca
tion is in operation. The relays SAl and SB1
are picked up at lthe beginning of a cycle of
operation and are dropped outat` the end of a
signal‘ß over -the cross-fl ' inboth directions;A
cycle of operation.
Arelays have been designatedÍîlI-B for controlling
trafiic'overthe mainftrackfrom signal ,il to sig
and route-relay„I,-'_'-2,fo
ontrollingtrafñc „be
l Í
5V1, -IìVl and LV1- operatev one step for each of
orfreverse positions in -acìxô'rçlance with `the 'par
position for each impulse. i
tic'ular 'route' to be fsetgju'pï andvf Aso -forl closing
suitable selections for determinlng‘the route codes
tobetransmitted. Thechangein positionof any
route relay causes the initiation .of the code trans
‘ _’mitter. 4Preference and .sequencebetween codesy
At the beginning of the cycle of operation, >the
firstgroup of impulses determines the selection _or
the station and is registered on the station selec
ing relays SO1 and SOS'lv; while the latter part/of
the series of impulses isy registered on positive
and negative code receiving relays PS andr NS'.
The positive‘and negative code receiving-‘relays
enforced by aA suitablelcode determining bank
shownin Fig. 2_as including-change relays ICH,
2C`H~and 30H and code-determining relays ICD,
_*ZCDmand 3CD.` The~ change ,relays C_H arecon
PS and NS have been shown in Fig. 6 as includ
ing relays 4PS,'4NS, 5PS, 5NS, SPS, GNS, ,'IPSv
trolled by ,starting relays; SR, shown as relays
and TNS, which relays in turn lcontrol the route ,
¿"55y Isn arid. 2SR.. „ kThe,chang'@naar SCH, is con
relays,'one for each route, selectively in accord
trolled by a manually operable self-restoring
the time spaces between the impulses impressed i
upon the line circuit including the line wires Il)` '
and I2, while the half-step relay VPl changes its' '
' AThese Yroute relays suitably 'select circuits for
controlling ythe switch> controlrelay Z` „to _ normal
, starting button SB.V
v A bank of vstepping relays ' IVI, ZV1, 3V?,` ¿IVR
tween >the signal v.I -and thezsigfna'l 2‘ in,` `both
l y
. type repeats the polarity of each of the impulses
impressed upon the line' circuit. Each impulse
relaysNR together .with tlresexitbutton XB con.
trol and select suitable route relays. These route
A line relay F1 of the ‘three position polarized 30.
ance with'the codefor particular. controlling cy
cles of operation. ~ These route relaysk include
¿,i‘fin' r:emergency switch.- control,A lever :SMLÍ is relays I--2R, 2--,IR, 4-6R, 6-4R, 4-2R and
shown in Fig. l asassociated 'withthe switch con
trol relay Z for operatingv the s_witch undery cer
2-'4R. Two stop relays I-2S and 4-6S are
also selectively controlled by the code combina 60
tion set up on the relays PS and NS for particular
tain f emergency conditions> to be` hereinafter
cycles of operation.
_., VAThe `code determining; relays CDhave associ
ated therewith a ‘manually` operable self-restoring
cancellingjbutton CNB, and alsosuitable relays
such as relays CHR-CDS, C, FC, NC, PC, EP,
SA, 2SA, IV, 2V, 3V,»4V, 5V, 6V and LVlin order
‘ to accomplish the properfstarting ofthe code
. type'communication system andthe control of
mal and reverse switch control relays WN' and
WR, Which relays WN` and WR are in turn rse 65.'
lectively controlled by the route relays., such as
‘ relay I-2R, but during certain emergency con
trol conditions, as hereinafter described, the re
lays WN and WR are directly controlled by lcode
combinations .set up on the relays PS and NS.'
the code impulses on the »line circuit intercon
necting the ` centrall office - with, the. 'ñeld station.
The relays of Figs. 2 and 3 and their relationship
tofeach other have beenßshown in >detail in the
prior application of- Judge and Bushnell, Ser. No.V
640,062,1ì1ed October 28,1931»Uf
-¿ `
'I'he switch machine SM is controlled by nor
The route relays, such as relay I-2R, coop-v
erate with ,the switch position repeating 'relay
WP to select circuits for the control of signal
relays IG, 2G, 3G, 4G, 5G and' 6G which ,re
spectively cause their signals I, .2, 3, 4, 5 andi
251’2. 15847
to indicate stop when such` relays Gïare deen
ergized and to indicatel clear when the respec
tive relays are energized, all in accordance with
the usual practices.
Communication part of the .s;1,lszîß'm`„.--ItV is' to
be understood in connection with the communi
cation part oi the system shown in Figs. 2, 3, 4, 5
and 6 that reference should be made to the prior
application of Judge and Bushnell,- Ser.' No.
640,062, filed October 28, 1932, for an exhaustive
description of such a code type` communication
system, only that part of such description being
pointed out herein as is deemed necessary for an
understanding of the present invention.
1-5 convenience in comparing the parts of the pres
tioned application Ser. No. 640,062, only the con
trol part of the operating cycle will be discussed
_in detail although the station selecting part of
the system has been illustrated in the drawings.
Also, the station selecting part'of the system may
be of any suitable type, and for the purpose of
describing the present invention only the appa
ratus at a single station will‘be considered.
Although, as above' mentioned, the stepping
banks at'the control oiîûce and at each of the
field stations start in synchronism, only the step
ping bank at the control ofûce and at the selected
ñeld station operate through a complete cycle
of operation, as means is provided at each ñeld
station to cause the stepping operation to cease l
at that station when such station fails to be se
ent disclosure corresponding to the' parts of such
prior application, the same reference characters
lected during the station selecting part of the op'
have been employed in this disclosure as were
used in such prior application.
Although the present invention is contemplated
as employed in connection with al communication
system providing both `for thel transmission of
controls from a central control oñi'c‘e to any ‘one
of a plurality of field stations, and for the trans
25 mission oi indications from each oi` the field st'a‘
tions to the control ofûce, as in the above men
tioned application, Ser. No. 640,062, the present
invention relates-more particularly to the trans--`
mission of route controls from the central oflicé
Thus, only those parts of
the communication system relating more directly
to the transmission oi controls have been in'di‘-`
cated; and similarly, the description relative to
the features of the communication system' will be
directed more particularly to the transmission of
` to the field stations.
equipment is located in the control ofñce and a
receiving equipment is located at each ofthe var
ious field stations. These receiving equipments
are connectedrto the transmitting equipment in
the control oiiice by a suitable stepping and con#
trol line circuit comprising a stepping line wire
I0 and a return line wireî I2.
The stepping line wire I0 includes a~ three; po
sition biased-to-neutral polar line relay FH at
the’control oñìce and at each of the field stations.
The transmitting apparatus at the control' oñice
energizes the stepping and control‘line' circuit
with a series of time-spaced impulses of polarities
selected in accordance with the station code calls
and the route control codes to be transmitted.
Each series of time-spaced impulses .comprises
a predetermined number of impulse and time
55 space periods, which is conveniently termed an`
operating cycle. In the beginning of such an
operating cycle7 a slow acting relay SA in the
central oñìoe (see Fig. 4) and a similar relay S-A1
at each iield station (see Fig. 5) is energized.
at These relays SA are made suiîicientlyv slow act
ing to be maintained picked up» between succes
sive impulses throughout the operating cycle,
`althougl'i'their circuits are momentarily opened
plated in connection with the particular embodi
ment of the invention illustrated, and particu
larly that station code calls are transmitted for
the selection of a particular station from among
a plurality of'such ñeld stations, after which‘a
route control code is transmitted to the par
ticular selected station to control the traffic gov
erning devicev at such station, consideration may
now be> given to an explanation of the manner in
which the codes are set up in the central oñice 30
and transmitted to ‘the field station to accom
plish the setting up of a route through the track
The system is normally at rest, but may be ini 35
controls, as hereinafter explained. While the
system is in this‘con‘dition of rest, or in the pe--`
riod of blank as Vsuch `condition is sometimes 40
termed, the stepping and control liner circuit is
normally deenergized; and similarly, the major
part of the relays of the system are deenergized.
'I‘hose relays which `are normally energized will
have their circuits pointed out when their opera
tion and functions are described.
usually left
been shown
line trafñc.
the cross-over TS (see Fig. '7) is
inv its last operated position, it has
in a position for the passage of main
The signals are normally “at stop”
as the signals are illustrated as being of the color
light type, and it is to be understood that the
lower or red indicator of each signal is normally
With the track sections I4 and I5 unoccupied
the track relays IAT and I5T are of course nor
mally pickedup.
Referring to Fig. 1, all of the entrance buttons
are in their normal positions, so that the system
is ready to provide for the establishment and
clearing of any of the possible routes through the
track layout.
Entrance-exit route interlocking-As above
mentioned, the system» of the present invention
a cycle to the stepping circuit causes the oper-'
ation of the stepping relays V at the control omce
in synchronism with the stepping relays at each
field station, one step for each time space be
tween impulses while the polarity of the impulses
is of the entrance-exit type so that if the operator
desires to set lup a route from the signal I to the
signal 2, he rotates the entrance button INB
90° in a clockwise direction, which closes suitable
contacts to energize its repeating relay INR', and '
in which position the entrance button INB re
mains until manually restored to put the route
serves to select a particular ñeld station and to
to stop, as later described.
The application of the successive impulses of
tiated by the operator for the transmission of
For the transmission oi controls, a transmitting
during each time space period.
Keeping in mind this general organization of
the completeI communication system contem
selectively position the relays PS and NS at the
selected station.
As the station selecting part of an operating
cycle is completely disclosedv in the above-men
After actuating the entrance button IN'B, the
operator then glances along'the miniature track
way and iinds that there are no lock lamps il
luminated betweensuch entrance button INB and 75
` amiga-i7?
the- exit button ZXIB which designates-the end‘
of the route and which the' operator depresses.
different groups ofv` 'conflicting' routes, each of
which" provides for aso-called parallel'route. In
In some cases the lock lamp LKB might be ile
luminated, such as when a route is cleared from
the signal 4 to the signal 6, as described in my
other words, everyfinterlocking plant usually has
aflargenumber of parallel routes, that is, routes
above-mentioned application'Ser. No. 69,905, but
which-maybe set up at‘the same time and donot
conñict, each parallel route of which has asso»
under' such circumstances', they miniature cross
ciated therewith routes which conflict With’such
over ts would indicatethel cross-over TS-to 'be
in a normal position, so that its operation would
10 not be required to set up the route fromthesi'g-t`
parallel route. Therefore, a parallel route and
its‘conflicting'routes-.may be conveniently termed
a group ofconñicting routes.
nal I to the signal 2, thereby making it perfectly' ' -fAs each group- of routes may have a route relay
proper for the operator to actuate the` exitbut-î
pickediup at any time, irrespective ofthe condi» ’
' tions ofthe route relays for the remaining groups '
»The operation of the exit button 2X3 occur
of fthe _interlocking1plant, the system ofthe pres
15 ring contemporaneously with the entrance button
ent invention provides an interlock between these
l2NB in an operated position,` closes a pick-iup „cir
cuit for route relay |-2`from (-1-), through a
groups solthat-only‘one ro,ute'_relay, althoughv sev
circuitlincluding front contact 20|l~of vrelay INR;`
back #contact 20| of route relay '4-2, windings
capable-of ~ conditioning the code transmitting
20 of:A route relay |-2, back contact> 202 of .entrance
relayf 2NR,..back„point„of exit ybutton* i2XB, to
eral ~may. be simultaneously picked uitwill>> be
meansdurin‘gvany particular cycle ofoperation. .
T! The present disclosure shows only~ a single
cross-overfthat'providesY a route which isÍ conflict
(_). 'I‘he energy. which iìows in‘this circuit
causes theroute relay |-2 to actuate'its Vpolar
contacts tothe right and to pick up :its neutral
ing ywith both ofxthe _two -parallel routes, but it is `
tobeeunderstood-‘thatthe'association ofthe paral-` '
contacts closing its stick circuit, which allows the
operator to 'releaser the self-restoring exit button
2KB, by reason of the application ofnegative'
potential from (L), vthroughv front `contact-m3
» stationfisiusedwfor‘ the control- lof, lthe cross-over "
of route relay |-2, polar' contact 204 of route
relayy |'-.2 in :a- right-hand position, tothe Fright
hand terminal ofrelay I-2.> .
„ .'
lelfroutes'with'iother routesv may be accomplished . 4 `
inthe usual Way. ‘ yEven though only av singleñeld 25
it Aisznecessary to Iprovide'an interlock between the " `
parallel routes inthepresent disclosure because
both-"ofthe routel relays 4-6 and |-2"may._be
_ picked'upatthe same time.-
»For the' ¿purpose'of'providing an'interlock-‘be- ,
Each of the> route relays are picked..l up in a ytween different groups-¿of routes (and other pur
similar manner and are maintainedfstuck up d_e
poses'flater .to »be’pointed out) ",_ a 'code determiningv '
pendent upon the return of their- respective en'- ' bank
of relays is provided y(s'e'e Fig. d 2). In this>
35 trancerbuttons NB to normal-at-stop positions,v ' bankfeach route' group has- associated therewith
which Vcontrol .will be readily apparent from »the
drawings. Itv will also be apparent that" if Ía‘
route were set up from the signal# to they signal
2f,‘“that the route 4_2 would bepicked up opening>
back- contact 20| :so-that the route relay.v |‘-5-2
couldnot .be picked up. Similarly„th'e:pick-up
circuit for the. route relay 4-2 includes> back con:-`
tact |99 of the route relay |-2 so that the route
relay-4+2 can not be picked up when the route
45 relayfI-Z
;~ As-it is possible
is pickedtoup.
havel' aplurality'of
routes established at thesametime, the Apick-11p y.
circuit for the route relayfd-B does not :include
aninterlocking contact on the route relay |ç2,
50', ‘nor‘ does the pick-up circuit for- route relay |-2>
achange relay CHV and a code determiningrelay
CD; ' The relay CH is picked up whenever a route '
relay' in alparticular `route group Ychanges its po
sition, `and’remains picked up until theucode con
dition -establishedby -the' change -in vposition of
thai-route relay has been transmitted over the`
communication system. vrThe Ycode determining
relay ,GD associated‘with such‘chan‘ge relay is
picked -up by therv relay CH, -’when the ypredeter
mined orderfof v,transmission ybetween the groups
permits-the~ transmission of a code »for that group.
Infiothenwords,‘the relaysV CD for the several
groups >tare so interlocked that only one Vof these"`
relaysprnay-v loe-picked up _during any particular ‘
operating cycle’of- the communication system'and 50
includeaback contact-„on ,routev relay 4_6'.; -Itis
believed that the remaining features of interlock
theserrelays are picked upon the successive cycles
of; operation in a predetermined order as deter
between entrance-_exit route buttons will be read-v
minedlby »the interlocking circuits.
ily-*apparent from the; drawings, it being‘unde'r- ,
»Under certain emergency conditions:` herein
stood that only onejroute relay vfrom‘amongfa after;- discussed, it becomes necessaryïto individu
plurality of route relays for conñicting routesmay allyifoperate the 4track switches andA cross-overs, v55
v'soa-¿that this. code determining bank' includes .a
change relay' vCI-'I and ~-a code determining relay>
Erom‘the `above discussion of. the ¿communica-Y C_D foryeach> group of track switches which may»v
picked up at `,any
one time.;`
v ¿ » codes.‘-Y
tion-_ system, it will be understood that‘only one
' beindividuallycontrolled on vparticular operat-`
„ code combination can be ¿transmitted vover the-
communication system-during any one" cycle of;
operationïandas-itî is necessary foreach Irollte
Itzis to be understood that if .therefwere more
routegroups inthe track layout, that each route
, relay, such- as relay ,4-16’,.,t'o` transmit a distinctive> group would have its additional relay CH and CD
65, code -to'the field location for establishing'a."'route„4 I connected to -thé bank'in asimilar manner asv 65
the systemis so‘organize'd- that only'fone-route thosershcwmalthough such groups might be con
relaycan be effective-to condition the codesend-'a’ trolledthroughthesam'efor another field station. '
‘ ing relays of theA communication systemj'duringi Also;y whenA seye?alfñeld stations are employed,k
« anyçoneycycley of operation. If `all of :the fro‘ute
eaèliwstation 'has ’its relay CH and CDV for the',
70S relays `Were for conflicting routes, then only one'` routeegroupsA associatedfwith such station and
d route'relay could be-picked up at a timeby 'reason-'l
ofïfthe route interlocking abovei'de'scribedVso that"l
a ffurther interlock` between the codes for the'dif
ferentroutes would ,beunnecessary
ì,ï»I~IoWever; the usual interlocking plant hasmany.-y
theygareïfincluded inthe code'determining bank 'of Fig. v2 with the same kindv ofan interlock as , «
showrifïfor’the relays Í ICH, 20H,- 3CH,v ICD, 2CD
@Regardless-of? the number of stations, and the 75
rlelay A+6,._>backï<contact. .2.-I ¿lief route relay .4_2,
lower*.«.w-indi«ng,of_,relay ISR, `front contact 2|.5
groups of routes for such stations, `a cancelling
button CNB provides `that any change»V which has
been stored in >the code >determiningzhank may
be manually cancelled, ’so> that the operatorf.,»rnay
lay 4.-;-6 ycrut/he lroute‘relay :4_2, only .one .of
whichcan be‘f'picke'doupfat the same time, shifts
theiapplication refill-)to the upper winding of
relay'lSR byzeitherthe closure of front contact
. set up an entirely new set ofcontrol conditions.
- Initiation of the system.-‘--:We »may now con-
sider hcw the picking up of a route relay,.such as
route relay l-2, effects the storage of Va change
in its associated relay `2CH so as to .accomplish
213,.,or theêrront contact 2| 4 .ofthese two route
relays respectively,. so that..the relay ISR. will` it
ifo the transmission of a route control code. 1 u
drop» away iwheneveri,a..change in .these route re
The relay ZSR is normally energized by .a cir
cuit closed from (+), through a circuit including
back contact 205 of- route relay I-2, lower wind
(_) ..
‘.:The picking‘up .of relay ICH .completes a re.
storing: circuit :for the :relay ISR‘ .by applying
(_),v--throughyfrorit `contact 2I.8 and wire 2I9~
tofthe-.ri’ghtfhand terminal .of relay ISR, which
is'ìcompleted »pwith route` relays .4.-6 and 4-_2
either iboth :deenergized ,or .one or :the other -picked
« ¿In the event .'.that the operator desires »to-trans fill.'
mit a switch control code inaccordance with` the
position oizrthewlever SML,.as later described, he
mustgde'press .the .self-restoring starting button
and remains dropped away as -both circuits are
. v
relayliCH, windings of relay ICH, front point Vof
connected as indicated bythe arrows> within their
cancelling» buttonl CNB, to (_) .
windings. Thus, the relay quickly drops away
contactpî the .cancelling button CNB, to a(--).
'Bhe .picking up .of the ‘relay ICH closes its stick
circuit `from (_1-l),- ,through a circuit including
back lcontaotz23 ofrelay ICD, front contact f24_of'
the closure of `front1 contact1205. I If «current flows
in the upper winding of relay.¿2SR„it reverses
the magnetism in the relay 2SR which causesv
such magnetism to pass through zero, because
the upper and lower windings are differentially
relay;;'ISR,_wire2ll, windingoi relay ICH, >front
cuit- including front contact 205,` upper „winding
of relayv 2SR, front contact. 206 of relay 2SR, ¿to
(_) ,providing .that the relay 2SR is not already
dropped away dueto its momentary >deenergiza.
25.' tion' between the opening of back contactv205. and
Contact .206.
pick.-up„\..cir’cuit'f,or the relay ICH from (+5,
throughv acircuit including backy contact 2.16 .of
When the route relay I-_2 is picked up, as
above described, the opening Aor“ AVback contact 205
opens the energizing circuit for the lower Wind
ing relay 2SR, and >closes .an energizing v circuit
20. for its upper winding from (fl-i), through acir
now open at iront
The dropping away of the relay ISRcloses va
ing of relay ESR, front contact 206 .of relay 2SR,
it will .be readily appar-á
of! relay :iS-R, lto"»(._§) .
ent »thatfthe picking up of leither .the route re
SB to'close .a pick-,up circuit for the relay 3CH
from..(,-l-_), through a` circuit including` a back
The dropping Yaway of the relay `ZSRscloses a
pick-up circuit for the change relay 2CH Vfrom
contact of starting button SB, wire 220, windings
of relay i3CH, iront contact of cancellingcbutton
(+), through a circuit including vback contact
20l of relay ZSR, wire 208, winding of relay 2CH,`
front contact of cancelling button >Cl\lB,*to (_).
CNHEto (1_). ‘ The `picking up of the relay v3CH
closesyi-ts `stick circuit from (+), through [a cir
cuit including back contact "|52 of relay 3CD, ,Ii5l.-of‘relay.3CH, `windings .of re
laylSCH, iront contact of cancelling button CNB,
The current Vv'vhi'ch flows in, this'circuit .causes
the relay 2CH to immediately -pick up and close’
a stick circuit from"(+), through `a circuit ‘in-1
cluding back contact 209 of relay i2CD,‘front con'
.I-f `sei/'eral iof‘the change relays CH are ener
tact 240 of relay 2CH, windings'of .relayÍ2CH,'
gized at the same time, only one of the codede 45
termining- rela-ys CD can `be picked `up during a
> front contact of cancelling button CNB, to .(_)'.'
As soon as the change relay 2CH picks up,»italso closes a circuit for restoring the relay ~ZSR.
from `(-l-), through a circuit-including- front-‘con
tact 205 of route relay I_`-2,"upper winding ofv
cycle u of ¿operation ofv the communication lsys
tems",.-=which will lprobably be best understood
after auco'nsideration of the manner in which a
relay 2SR, wire 2H, front contact 2I-2 of relay
20H, to (_). When the relay ZSR pi_cks"up, the
particular@ code determining relay‘CD is ‘picked 50
up when only «one relay CH has »been conditioned.
in `a .similar manner as` the shift from the »back
« point to the front point, which deenergizatíon> of`
gized through its stick circuit> from (+), throughA
"'llAssu/ming that'the'operator desires to vset up
closure of its front contact 206 connects (_) to
the right~hand >terminal of its upper v‘winding» theïroute’irom the' signal vI to the signal 2, as
thereby closing its stick circuit to maintain the above'lc'onsidered, the r`pickingup of the route
relay ZSR picked up irrespective of the subse-` relay-‘1_2 »causes Athe dropping ofthe relay ZSR
quent opening of contact 2I2 of relay 20H'. The' followed 'by-»the picking Íup of the relay ZCH
opening of back contact 201 of relay rZSIä’f-ref-Ví which in turn restores -the‘rela‘y qvZSR..
The picking-up of the relay 2CH `‘also sup
moves the (-i-) from the pick-up circuit of =-the»
relay ZCH, but the rel'ayZCI-I remains picked up> plies' energy to the change repeating relay CHP
by a circuit closed from (+), through a circuit
GO by reason of. its >stick circuit, above pointed out.
It will be readily apparent that the shift „of including back contact 25 of relay SA, back con
the contact 205 from a front point to a back tact‘26of relay FC, upper winding of relay CHP,
point will cause the'drop away "of the relay 2SR wire‘223, frontcontact 224 of relay 2CH, to (_).
As'soon as the relay CHP picks up, it is ener
the relay ZSR will in turn _cause the .picking Vup
0f the relay 2CH and .its .own restoration. In,
other words, the relay ZSR-,is` dropped away toA
pick up the relay` 20H and isgagain :restorede'by
, thepicking -up of the relayy 2CH.regardless- of’
whether the route relay. I-v-2 is' .pickedy up. or
whether it is dropped away.`
. The «relay ISR is provided„withanormally-'en-A
ergized holding circuit closed from (-|-) „through
7,5;*a circuit _includingbac'kecpntact „2113.«0ffi1î011te
a circuit `includingloack contact `30 of relay LV,
iront contact 3| of relay CHP, lower winding of
relay CHP, to (_).
VThe picking! up of relay CHP closes front con
tact 63 >so as tosupply energy from (+), to the 7,0
heel Vof contact 64 of relay EP so'that although
the-contact: 64 -is intermittently opened through
out‘lthe cycle .of operation, the relays 2CD and
CDS remain Ienergized until the relay CHP is
dropped away Lupon .theiopening of contact 30 75
at the end of the cyle of operation when thel la'st
step relay LV is picked up. It will be noted that
the relay CHP could not be picked up if the sys
tem Were in operation because of `the open condi
, tion of back contact 25 of relay SA', nor could
impulses for a cycle 'of operation." However, itis
considered expedient to briefly consider the‘step
by-step operation in the central oñice withwre
spect to Fig. 4 before considering how thek dis
thetrelay CHP be picked up if a field station has
tinctive characters of the impulses are `selected in
accordance with the codes to be transmitted.>
already registered a field start because ofthe
open condition of back contact 26 of'relay FC,
With the relay C and CD both picked up, al _pick
up'circuit is closed for'one or the >other of the
which relay FC registers such a field start as relays PC or NC, as will be presently described,
10 has been disclosed in the above-mentioned ap-` but considering for the moment that one. of these 10.>
plication'Ser. No. 640,062.
' ,
relays is picked up- without going into the'detail
The picking up of the relay CHP closes .its ofits manner of control, it will be apparentthat
front contact >2!) which completes a. pick-up cir
a positive or negative impulse is placed upon the
cuit for the control oñîce starting relay C from control line circuit includingl .the line wires l0
15 ._(-|-), through a circuit including back Contact and I2.
'28,01* relay SA, front Contact 29 of relay CHP,
V~If the relay PC is picked upvthe control oiiice
windings of relay C, to (_). `As soonas the battery is connected into the line circuit toV trans
relay C picks up, it closes its stick circuit from l mit 'a positive impulse; 4While if the relayl NC. 'is
(-I-), through a circuit including back-contact
32 of relay 2SA, front contact 33 of ,relay C,
windings of relay C, to (_).
nected into the circuit so as to transmit a nega
tive impulse.
_ At the start of the cycleof operation, the relay
SA picks up first followed by its repeater 2SA so
that front Contact 28 is closed before back con
tact 32 opens, thereby maintaining the stick cir
cuit for the relay C throughout the cycle of oper
ation.. But at the end of the cycle of operation,`
the Yrelay SA drops away before its repeater relay
2SA >drops thereby opening front contact28 be
, `Y’I‘he'application of an impulse upon the step
ping and control line circuit energizes the line
relays F in accordance with the particular polar
ity, but irrespective of the polarity'of such im 25.
pulse the line repeating relays FP are energized
to repeat the impulse.
»' In 'the central oñìce, the closure of front con
cuit for the relay C is momentarily opened and
tact 68 of relay FP energizes its repeatingv relay
2FP which in turn through contact 69 energizes
relay SA, which is also repeated upon the closure
therelay drops away.
of its contact 10 by relay 2SA.
30 fore back contact 32 closes so that the stick cir
. The pickingy up of the relay C completesa pick
As soon as the relay SA picks up a circuit is
up circuit for the relay 2CD by the closure of its
closed for picking up the half-step relay VPfrom ,
(-l-) , through a circuit including front contactfll
35 front contact 35, which pick-up circuit is’closed
lfrom (-|-), through a circuit including back con
tact 30 of relay LV, front contact 35 of relay C,
back contact 34 of relay 2SA, back contact 36` of
relay CDS, back contact 31 of relay` 3CH, front
contact 38 of relay 2CH, upper winding of relay
2CD, front contact of cancelling button CNB, to
>As soon as. the relay `2CD picks up, its stick
circuit is closed from (-I-) , through a circuit'in
45 cluding back contact 64 of impulse repeating re
lay EP, windings of relay CDS, front contact 22|
of relay 2CD, lower winding of relay 2CD, front
contact of cancelling button CNB, to (_). The
current which flows in this stick circuit notA only
4lso holds‘the relay` 2CD energized, but also picks up
the code determining stick relay CDS which opens
its back contact 36 to prevent any other relay CH
(which is more superior to the'relay'ZCI-I) from
picking up its relay CD, such as for example, the
55 relay 3CD' by the relay 3CH closing its front con
tact 31. ' It is of course apparent that the open
ing of back contact 38 of relay 2CH prevents an
inferior change relay CH from picking up its
relay CD.
picked up the control oilice battery CB is con’--
of relay SA, front contact 12 of relay 2FP,.` back
contact 13 of relay IV, windings:v of relay VP, to
(_) .’ As soon as the relay VP picks up, it closes
one of its stick circuits from (-i-), through` acir
cuit including front contact 1I of relay SA, iront
contact 14 of relay VP, back contact-13 ofv relay
IV, windings of relay VP, to (_).
' ‘ `
With the relay VP picked up, a pick-up circuit
is closed for the relay E as soon as relay 2SA has
' picked up from (-|-), through a circuit including
front contact 90 of relay 2SA, front contact 92 of
relay VP, back contact 93 >of relay IV, upper
winding of relay E, to (_).
The relay E closes front contact 95 `and ener
gizes its repeating relay EP Which in vturn opens 5.0.
back >contact 52 -included in the >stepping and
Lcontrol line circuit causing the end of, the first
, »
Therefore, it is apparent that the durationlof
the ñrst impulse includes the successive pick-up 5.5.
periods of the relays F, FP, ZFP, SA, 2SA, E and
EP. f
The deenergization of the stepping and control
_ line-circuit is repeated by the relays F, FP and
The picking up of the relay 2CD shifts the sup
ply of energy for the stick circuit of relay 2CH
from (-I-) ,through back contact 209 of the'make
before-break >contact 209, to a circuit closed from
between impulsesso4 -that they remain steadily
picked up throughout the cycle of operation.`
(+) , through a circuit including back contact 66
, When the relay 2FP `drops away, a pick-up
2FP, but the relay SA andZSA, being slow acting,
remain picked up during the time space periods
ofvstepping relay 6V, wire 222, front contact 209 circuitk is closed forthe stepping relay IV from
of relay 2CD, front contact 210 of relay 2CH,l (-1-) , through a circuit including front contact 15
windings of relay 2CH, front contact of cancelling 4ofrelay SA, back contact 16 of relay 2FP, front
button CNB, to (_). This stick circuit for the
relay 2CH remains closed until the system-.oper
contact 11 of relay VP, back contact 18 of relay
7.0 ates througha cycle opening the back contact 66
the relay IV picks up, it closes a stick circuit,
which Íis maintained closed throughout the re
mainder of the cycle, from (-|-) , through a >circuit
including front contact 15 of relay SA, front con
on the sixth step of the cycle. This releases the
relay 2CH in which condition it remains until a
subsequent change is registered on the storing
relay 2SR. Thus, withthe relays 2CDand C both
75 pickedup, the system is conditioned. totransmit
2V, windings of relay IV,v to (_). As soon as
tact 19 ofI relay IV, windingsof relay'IV, to (_).
.-...The picking up of the relay IV opens‘rthe pick 755.2
up` and «stick circuits previouslycpointed out for
the‘relay VP, but another holding `circuit ihas
been closed prior to the vpicking ,up of `the relay
IVìby the closure of back contact ‘I2 of relay-ZEP
so that .the relay VP remains picked :upiby reason
of a stick circuit from (-l-), through .a circuit in.
cluding >front contact ‘II of relay SA, back contact
1210i relay 2FP, front contact .80 of relay VP,
windings of v»relay VP, to (-). This holdingicir
cuit provides that vthe relay VP is held up until
the `relay 2FP is again picked up.
lThe picking up of relay »IV opens `back contact
93 lwhich deenergizes the relay E, which in turn
deenergizes :the relay EP by opening contact«95.
15 As soon as the relay EP drops away, the contact
99:»ofo'relayL/2SA, front contact 9| 'of relay 'LV,
Winding-stof ',relay LV, to (_) .
~ ‘_zlt =is ,noted that ‘the jumper 225 provides for
the :closure ofthe pick-_up circuit of relay LV up
orïrfthe 'picking up.of relay VP. This is true When
theV steppingrelays IV, 2V,‘3V, etc. are an even
number,„-_as;,in this disclosure. However, if an
odd number >of stepping relays V were employed,
the _jumper 225 would be in its lower position so
asjstoV include the back contact 88 of relay VP
instead of front contact 88.
.itfwill -beapparent that relay LV is stuck up
upongfront contact 99 of relay 2SA, which is the
lastlslowv acting cycle demarking relay to drop
a-_wayat therendof the cycle, therefore rendering
52 in the line circuit is closed so that the next
the relay LV the last relay in the system to restore
impulse is impressed upon the line circuit the
character ,of Áwhich is determined by the particu
lar ¿pulsing relay -PC or NC which has been picked
20 upwduring xthe-time‘that the relay EP has main
tained the line circuit open.
Therefore, »it will be apparent that >the duration
of vthe time space period vincludes the drop away
periodsxof `the relays F, FP, 2FP, E and EP asvwell
as the ,pick `up Yperiod of the proper stepping relay,
in this case vstepping relay IV.
The application of the second impulse upon the
line circuit causes `the energization of the relay F
at the control oiìce and at each field station
which -repeats the polarity of the impulse. How
ever, lirrespective of the polarity of the impulse
the relay FP in the central office and the relay
to normal.
t’Ilhe .picking vup' of the relay VP with the step
-pinglrelayßV picked .up closes an energizing cir
_cuit forithe relay E, lfrom (-1-), through a circuit
including front contact '90 of relay 2SA, front
Contact 92 of relay VP, front contact 226 of relay
6V, upper winding of the relay E, to (_). This
energization of the relay E is repeated by the
relay EP upon the `closure of front contact 95,
2FP -are ,successively picked up.
As soon as the
which.relay.EP in turn opens the line circuit at
back contact 52 marking the end of `the last im
pulse of the cycle of operation. The relay EP is
maintained energized by reason of the main
tained-energization of the relay E, even upon the 30
dropping away rof the relay VP when the relay
SA drops for the end of the cycle, by reasonof `an
energizing circuit closed from (+), through a
reason .of the opening of its :stick circuit includ
circuit including front contact 96 of relay 2SA,
back contact 92 of relay VP, front contact IDB 35
ing back .contact 12.
Upon the dropping away of the relay VP, the
next energizing circuit for the relay E is closed
Having 'considered how the step-'by-step opera
tion V.takes place so asto impress impulses upon
relay 2FP picks up, the relay VP drops away .by
from `(-{-) , >through a circuit including front con
tact 99 of relay 2SA, back contact 92 of relay VP,
back contact 96 of relay 2V, front contact 91 of
of relay LV, lower winding of relay
to (-) .
the Aline circuit, we may now consider how the
distinctive .characters of these impulses are se 40
lected in accordance with the codes to be trans
IV, lower
of Winding
lthe relay
of relay
E is E,
to» (_).by the
relay EP which marks the ,end of the second im
pulse by the opening of >back contact 52.
' Therefore, it will be apparent that the second
impulse `is of a duration which includes the pick
up periods of the relays F, FP, ZEP, `E and EP as
well as the drop-away period of the relay VP. All
60 of vthe subsequent impulses are of the same dura
tion, while all of the 'time spaces are similarly
of the same duration as described vin connection
with the ñrst time space period.
The ñrst ~im-
pulse period is the longest impulse i-n the cycle for
56 the «purpose .of >picking up the cycle marking re
lays SA land12SA in the central oflice and cor
responding relays at the field stations, such` as
relays fSAl and SBl of Fig. 5.
It isbelieved that it will be readily apparent
how the step-by-step operation continues
throughout Vthe cycle of operation, a stepping
relay being picked up upon each dropping away' of
the relay 2FP and the relay VP changing its posi
tion upon each picking up of the relay 2FP.
During the last impulse of the cycle of opera
tion, the VP relay is picked up, which closes „a
Transmission of station .and route codes-_As
above mentioned, `the system of the present/in
vention >is contemplated as being-used with a
communication system having a large number
of afield stations, although only one has been
shown in the present disclosure, the remaining
stations ibeing similar to the one shown. Thus,
the first part of an operating vcycle must 'have'
impulses of `polarities selected in accordance with
the c_ode call ofthe station to which the» route
codeV is ¿to 'be transmitted, while the later for re
mainingimpulses of the cycle of 4operation must
have their polarities selected in accordance with
the particular route code then set up for that
`For convenience in considering the various
>codes which are used in the present disclosure
and` for the various possible codes which may be 60
set uDfa typical code table has bee-n shown loe-`
low.> This typical code table shows all of vthe
route control codes which are employed at the
station ¿shown in Figs. .5, 6 and 7, but-.preceding
these Vroute `control codes only that station select- 05
ing code required for the station under .consider
ation has been shown.- The first three impulses
pick-,up circuit for the relay LV as the >stepping - oíia cycle are shown as used for station selection
purposes;` While the last four impulses are shown
as used `for route control codes. When the 'three 70
impulses `lfor station selection are combined in
relay> 6V was picked up upon the preceding ltime
space period. This circuit is `closed vfrom (+),
through a circuit including front contact `.88 >of
relay VP, jumper 225, front contact 89 of >relay
6V, windings of relay LV, to (_). As soonas the
relay LV :picks up, its stick circuitis closed vfrom
(fl-_), through ,a ,circuitincluding Vfrontcontact
the `rdiiîeren-t possible combinations according
tothe-exponential law fof the Baudot code„eight
distinctive `station `code calls are provided. ,For
each :ofzzthesefstation codes, 4sixteen route ¿control
9 .
codes are provided by the four vcontrol impulses. This impresses a positive impulse upon the line
Thereforevif the full code capacity of the seven 1 circuit for the ñrstimpulse period. By referring
impulse cycler were employed,` the code table tothe typical code table, it will ¿be apparent that
this agrees with the character of the impulse’
would haver 128 codes, but for the sake of sim
plicity only the codes employed at the station for the first impulse for station selection.
Uponthe picking up'of the relayf’IV during
shown have been included in the typical code
>`the ñrst >time space period of the cycle, con
tact 243 shifts the applicatio'nfof energy to the
code bus 246, whichthrough front contact 241'
Typical code table
Code No.
Route control
of relay 2CD allows the code jumper 23I" to 'cle-l
termine thatY the next impulse appliedto ythe line
circuit shall be positive by energizing the _relay '
PC over `the bus 41.
„ v
Upon the picking up of the relay 2V during
the second time space period of the ‘cycleLcon-y 15
tact~242 shifts :the application of energy to¿ the
code bus 248 which through fro-nt contact* 249 of
relay 2CD allows thecode jumper 232 to deter
mine that the next impulseapplied to the line
Vcircuit shallv be negativeby energizing' the relay@
NC over the bus 48.
- With reference to Fig. 2„.the `code determining
Y relay ICD is provided with station selecting code
jumpers 221, 223 and 229; code determining re
lay 2CD is provided with static-n selecting code
J jumpers 23€?, 23H and 232; and, the code deter
mining relay 3CD is provided with station select
ing code jumpers 233, 234 and 235.
The relays ICD and 3CD are respectively pro
vided with control code jumpers 236 and 231. v
The relays PC and NC have their right-hand
terminals connected toy (_), While their leit
hand terminals are connected to buses 41 and
48' which extend through the code determining
bank o-f Fig. 2 and the route relays orA Fig. 1 yas
well as the Z relays associated with the` emer
k . gency switch control levers, suchÍ as lever SML.
Upon the picking up of the cycle controlling
The route lrelayy I-2 now determines the char
acter of the remaining impulses of- the cycle. As
`the route desired to be set up is from the signal
I to theY signal `2,'the route code employed is» 25
the code No. 3 in the typical code table,` from
which table, it> wiu be apparent that the rfoliow- i
description of the successive circuitsl set a » 'ì .
upon each of the steps will select the code charia; q
acters for this code No.3.
Upon the picking up of. the relay 3V during
the third time space period ofthe cycle, con- .
vtact 24| shifts'the application of energy to the
code bus 259 Which‘through front contact 254
of relay 2CD over the wire 258 and through front; 35
Vcontact 262 of» route relay I-2 causes the fourth '
impulse applied to the line circuit to be `positive
by energizing the relay PC over the> bus 41. ‘
Upon the picking .up of the relay 4V during`
the fourth time space periodr ofthe cycle, conaz'. 40
tact'24ü shifts the application of energy to the,A
code bus 25| Which through front contact 255 of
relay 2CD over the wire 259` and through-front
contact263 of route relay I-2 causes the fifth
applied to the line circuit to be positive,`
ylay CD up for the cycle of operation to ensue',
1 _relay C and the particular codedetermining re
- the circuit selections-»are conditioned so that- the
i station selecting code jumpers for the relay CD
which is picked up are' successively rendered ef
by energizing the relay PC over’the bus 4-1.
Upon the' picking up ofthe relay 5V during
the fifth time vspace period of the cycle, con- f
tact 239 shifts the application of energy to the
‘ fective tol energize therelays PC and NC for
bus 252, which through front contact 255:A50
50 the successive impulses after which the connec ' code
~ tions on the-.route relays, or the Z relays are> of relay 2CD- over the Wire 26B and through'
successively rendered eiîective to position the-re
.lays 4‘PC 'and NC for the remaining successive im
front contact 264 of lroute relay I-2 causes the \
sixth impulse applied tothe line circuit to be
pulses of the cycle'of operation. It is believed - negative by energizing> the relay NC `over the
55 that this functioning of the system will be read
ily understood by a consideration of the manner
, in which the station selecting code is impressed
bus 48.
¿§55 I
Upon the picking up ofthe relay 6V during" .
the sixth time space period fof. the cycle, con»,
upon the line circuit bythe code> jumpers 230, . tact 238 shifts the application of energy tothe
23| ’and 232 of the code determining relay 2CD code bus 253 which through front contact 2510i
and by the »connections associated with the route _ relay_2CD over the wire 25| and through front,l
relay |-2 assuming such relay to be picked up contact 255 of route relay I`-2 and polar con
to clear a route from the signal VI to the signal 2.l tact265 of route relay I'--2 in a..right-hand
>When the relay -2CD picks up following the position causes the seventh impulse applied' to
the line circuit to be positive by> energizing the
picking up of the cycle controlling relay C, ener
gy is applied to’ the'code sending relay PC in . relay PC over the bus 41. ~
Thus, the route relay I-2 accomplishes thev
accordance with the position of the code julmper
23B to determine the polarity of the ñrst im-v transmission of the code No. 3 forv clearing; a
’ Í
pulse by a ¿circuit closed from (-}-), through a route from the signal l tothe signal 2.y
We might consider at this time that the op
circuit including front contact 4II of relay C,
back contact 238 -of relay EV, back Contact `239 erator after having cleared this .route desires,r
of relay 5V, back contact 242 of relay 4V, back to putl the route to stop either'because of a
contact 24| of relay 3V, back contact 242 of re- . ¿change in his plans for ltheon-coming train
lay 2V, back contact 243 of relay IV, code bus _or because the train has passed over .the route
244, front contact 245 of relayv2CD, code jumper Y and he desires to change the route setup for a
75 230, bus wire 41, windings of relay PC, to (_). A.succeeding train._ To do this, al1 that isneces?.Y .175
sary is for the operator to restore the entrance
button INB to its -normal vertical position de
energizing its repeating relay INR and opening
front contact 200 which in turn deenergizes the
route relay- I_2.
The deenergization of the route relay I_2
VIt was mentioned above `that only one of the
route relays 4_6 and'4_2 may be picked up at
the same time, so that both ro'ute relays `may be
associated with a single code determining group
including relays ICH and ICD. Also, as these
route relays 4_6 and 4_2 govern routes which
` causes the picking up of the relays 20H and 2CD
are conflicting routes, the same code may be em
providing the operating conditions of the com
ployed for putting both routes to stop, but as
the picked up condition of either route relay is
munication system are proper, as previously de-V
lo scribed for the transmission of a clear code, so
jthat a code is transmitted with the contacts of
the route relay I_2 deenergized.
vWith reference to the typical code table, the
stop code ‘has been selectedas code No. 13 so
that the back contacts 262, 263, 254 and 265 of
>the route relay I _2 are so connected to> the buses
41‘and 48 as to provide this code No. 13. In this
connection it might be well to know that the
clearing code No. 3 is in the first half of the
Yroute control codes while the stop code is in the
last half, which causes the fourth impulse in the
j code to 'differ for the two complete codes. This
makes necessary the wire connection from the
heel of contact 254 of relay 2CD through wire
258 and contact 262 of the route relay I_2 to
the buses 41 and 48. But, if two codes were em
ployed in the same half of the route control
codes, such selection might be eliminated and a
yjumper connected from the heel of contact 254 to
one or the other of the buses 41 and 48, similarly
as for a station code jumper. This has been
illustrated specifically in connection with the
route codes for the route relays 4_2 and 4_6
by the provision of the route control jumper
236. These two methods of connection have
been shown for the purpose of illustrating that
the route control codes for the different routes
may be selected as desired from the complete
route control code table, and that the various
routes do not necessarily require particular codes.
It may also be noted that if the route relay
I_2 were picked up in response to the opera
tion of the entrance button 2NB andthe exit
button IXB so asto actuate its polar contacts
to left-hand positions, then the code No. 4 will .
be applied.
The only diiference between code
Nos. 3 and 4 is found in the character of the
seventh impulse which is determined by the posi
tion of the polar Contact 265. Although this se
lection of codes for the two routes having op
posite directions diifer only by the character of
a single impulse, it is to be understood that codes
may be selected which differ by the character of
two or more impulses, if so desired by providing
55 additional polar contacts on the route relay-I_Z
-and suitable circuit connections. Also, the dif
ference between codes selected for opposite di
to transmit a code for clearing its corresponding `
route, the picking up of either relay must also
prevent the transmitting of the stop code.
Therefore, the code buses 25|, 252 and 253 are
selectively connected to the buses 41 and 48., _.
through back contacts of both of the route relays
4_6 and 4_2 so that the picking up of either
route relay connects code buses 25|, 252 and 253
selectively to the buses 41 and 48 in accordance
with the particular clearing route code of the'ïf‘go
route relay then picked up and disconnects the
stop code connections which are in accordance
With the code No.9 in the typical code table.
Transmission of emergency switch control
code._The manual individual control of a track#
switch is desirable under certain emergency con
ditions which arise in an interlocking plant, such
as the operation of track’switch back and forth
when it fails to entirely complete an operating`
stroke due to ice or lumps of coal or the like,"
and such as the setting up of the trackway for
the passage of hand cars and the like although
it is not desired to clear the signal for such a
route. This manual control is provided in ac~
cordance with the present invention in such a LV'35
Way as to be'possible so long as the track switch
is free to be operated, but when it is included
in a route which is'cleared by the entrance-exit
control, the operation of such switch by the
emergency switch machine control lever -SML is‘k 40
effectively prevented.
Assuming that all of the routes are at stop,
letlus consider the operation in response to the
use of this emergency switch control lever SML.
The operation of lever SML to-its reverse posi-'F145
tion closes contacts 214 and 215 to complete a
circuit from (-l-), through the lower winding R
of the relay Z, to» (-); while the operation of
the lever SML'to its normal position closes con
route relay 4_2 which has its polar contact
261 provide the difference between the two codes
for opposite directions for the route from ‘signal
tacts'216’and211 to complete a circuit from (+) ,l-ï 50
through the upper winding N of relay Z, to (_).
The energization of the reverse winding of the
-relay Z actuates the polar contacts of this relay
to left-hand positions and picks up its neutral
contacts; while the energization of the normal i" 53
winding N of the relay Z actuates its polar con
tacts to right-hand positions and picks up its neu
tral contacts. This'is because the windings N
`and R are differentially connected. Therefore, if
both of the windings N and R of the relay Z are? (if)
energized at the same time the magnetic flux
produced to act upon the armature is substan
tially Zero because of the neutralizing effect of
4 to signal 2 on the fifth impulse of the cycle.
It is believed that it will be readily under
one winding upon the other. This feature of
operation comes into effect in the event that a"Y
stood by analogy to the description given in con
nection with the route relay I_2 how the` other
route relays 4_6- and 4_2 provide for the trans
route relay, such as route relay I_2, is picked
up closing front contact 218 which applies en
mission of their route control codes when the
code determining relay ICD is picked up as pre~
that if the lever SML is operated at that timeI
rections in a route may be provided on any
impulse or impulses desired, which has been il
60 lustrated more speciñcally with respect to the
viously described.
However, it is believed that
it will be expedient to point out the reason for
the chain stitch'interlock between the contacts
268, 259 and >21B of route relay 4_2 with the
contacts 21I,` 212 and 213 of the route relay 4_6.
ergy to the normal winding N of the relay Z so
to its reverse position, the reverse winding R is; 70
also energized and the contacts of the relay Z
drop away. With the contacts 219, 28B and 28|
of the relay >Z dropped away, such relay cannot
transmit a code as will presently'be described.
‘Similar operation >occurs when the route relayI
2,121.84? Y
4--2 is pickedup closing the Contact 282 to en-- irrespective of the polarity of the impulse.` This
ergize reverse winding Ref the relay Z if lever ` ñrst impulse is alsosuñîciently long to pick -up
SML is operated'to its normal position to also the slow acting relay SA1, which remains picked
energizethe normal winding N of the relay Z.y up throughout the'operatingv cycle eitherby re
In otherwords, if a route relay is picked up at ceiving momentary energìzations through 'front
the same time with the emergency lever SML in
an operated position, the contacts of the relay
Z assume deenergized positions and cannot effec
tively transmit a code.
contact' |01 of relay FP1 or from the polar con-`
tact I0| of relay F1. So long as the station is ~ I
capable of being selected or has. `been selected, n
the relay picked up and the relay «FP1 '
If, however, all routesare at stop involvingthe
continues tov operate to repeat the impulses by
associated `track switch or crossover, theni'the
the line relay F1, but when ther station relay SG1
_ operation of the lever SML to the normal or re
:drops away, then the relay FP1 ceases operation.
verse positions 4correspondingly energizes the re
lay Z andconditions it to transmit a switch con
The stepping relays V1 andhalf-step relay VP1
`are controlled by the relay FP1 ina manner'ex
trol! code, which is effected when the operatorI 4plained in detail for the-'stepping bank ,inf the
` actuates the self-restoring starting button SB to
pick up'the change storing relay 3CH, as pre
viously'pointed out, for causing the initiation of
`the system into a cycle of operation.
i 'I'he first three impulses of the code- are deter
control oflice.
y yThe station selecting relaySO1 yis picked up .'25 ,
at the beginning of the'cycle of operation and is
maintained selectively picked up dependent upon> "
1 the character of the iirst three impulses whichv
mined in accordance with jumpers 233, 234 and.` f for this station‘have been selected as (»-|-) .(-|-)
235 to transmit the station code call (-|-) y (-1-)
(-‘), ’as assigned in the typical code table.- v From'
the typical code table it will also be observed
(`-), as seen in the typical code table. This code
combination has been set up by the station'code
selecting jumpers |||, ||.2 and | |3 for the first
that the codes Nos.. 7 and 8 are selected for the three impulses in the cycle of operation .respec
control of the reverse and normal operation of tively. At the end of the station selecting im
the track switch. As the fourth impulse in each pulses, the third stepping relay 3V1 is picked up
of these codes is the same, then a control jumper rendering the jumper |29 effective to maintain
such as 231 is employedto determine the char
the station selecting relay S01 picked vup throughacter of the fourth impulse. The fifth and sixth l `out the remainder of the cycle of operation until i 30
impulses could likewise be determined by a con
'the last stepping relay LV1 _is picked up openingj '
.trol jumper in place of the extension of the code back contact I3 | .
Abuses through the Z relay, but it .may be de
Thus, the stepping relay bank.Y Voperatesv
sirable to control' additional switches through the throughout the cycle andthe picked up condi
same. code determining group, that is, relays tion of the station selecting relay S01 provides 2535 y
SCH and.3CD, and in order to be able to obtain that the decoding relays NS and PS may. be posi
the additional combinations, it is necessary to
carry Vthe selections through any other relays Z
tioned in accordance withy the character ofthe
route control code impulses. All of the route con
.in a chain stitch fashion from the back contacts trol decoding relays NS and PS are .shown in'Fig.f`
219, 28D and 28| ofthe relay Z in a similar fash . 6, but as typical of- the .manner in which these
ion as ,hasbeen provided in connection with con
relays are selectively picked up in `accordance ,
'A tacts'268, 269, `210, 21|, 212 and 213 for the with the vcharacter of the code impulses, only the .
route relays 4_2 and 4_6.
»However, for the purpose of the present dis
pick-up circuits for the relays 1PS andlNS have Y,
been shown in Fig. 5.
T45 closure, the code buses 25|, 252 and 253 havefbeen
. More specifically, if the seventh impulse of the
shown respectively carried through front con v cycle of operation is a positive (-1-) impulse, then
tacts 283, 284 and 285 of the relay 3CD over wires the polar line relay F1I has» its polar contacts
2145 v l
28,6, 281 and 288 to the contacts 219,280 and 28| operated to the right and the stepping relay 6V1
respectively. With the -relay Z pickedv up, the l having been picked up, a circuit is closed from
f 5.o connections from contacts 219 and 280 provide (-|-), through a circuit including front contact 50
that the ñfth and sixth impulses shall be nega
Ilß‘of station selecting re1ay'SO1,y polar contact
tive while the seventh impulse is .positive if the `| I4 of line relay F1 in `a right-hand position, front
relay Z is actuated to a normal position and is contact 290 of stepping relay 6V1, lower winding
negative if the relay Z is actuated to a reverse of decoding relay 1PS,`to (-'-)». When this relay
position as determined by the polar contact >289. 1PS is picked up, itis maintained picked up by
When the switchl control code has been trans
a` stick circuit (see Fig. 6) closed from (-1-),
mitted, the system of course restores `tofits nor
through a circuit includingfront contact 29| of`
4. v mal condition dropping the relays 3CD and 3CH, station selecting relay SO.1,îfront contact 292 yof
as previously described. However, the relay Z relay 1PS, upper winding .of relay 1PS,k to (_).
1.60 will remain in the position to which it is actu
This stick .circuit is maintained closed through
ated by the lever SML until this lever SML is out the cycle of operation, butias the picking up
restored'to its central normal position.
of the last stepping relay LV1 ’causes the> station
Field station reception of codes-Before' con
selecting relay S01 to drop away, avfront con
' sidering how the route control codes are received
tact 293 on the relay LV1 is provided to con-_
at the iield station, it is considered expedient to tinue to energize the stick circuituntil such slow
briefly point out the operation of the field station acting last stepping relay LV1 drops away. There
-'code receiving unit, although reference may be is no interval of opening in the. stick circuittasf
made to the above-mentioned applic'ation'YSer. >the relay LV1 picks up before the relay S01 drops
No. 640,062, filed October 28, 1932 for a detailed
)description of station selection and the like.
Infasimilar manner, if the seventh impulse is
The ñrst impulse of a cycle of operation im
negative in character, a pick-up circuitis closed
pressed upon the control and stepping linecircuít e for the decoding relay 1NS (see Fig. 5) from (-|-)',
including line'wires I9 and |2, is repeated the vthrougha circuit including-front contact ||8 of
line relay-F1 .so as to energize the repeating relay relay S01, polarcontact || 4 of relay F1 in a left
yFP1 through the mediumzof the polar contact |0| hand position, front contact 294 ofçstepping relay
6V1, lower winding of relay TNS, to (-); When
the ldecoding relay TNS` is picked up, it is main`tained stuck up throughout the cycle of opera
tion by a stickY circuit similar to thatyprovided
for the relay TPS, namely, a circuit closed from
(~|-), through a circuit including. front contact
29| of relay S01, front contact 2950i relay TNS,
upper winding of relay TNS, to.(-).
It‘will be readily apparent that each of the
decoding relays 4PS, EPS, âPS and TPS are re
spectively connected to front contacts `IIE, 29S,
-29T and 290 of the .stepping relays shown in
Fig. 5; while the decoding relays ANS, ENS, ßNS
andYTNS are respectively connected to front con
tacts H9, 298, 299 and 294 of the stepping relays
shown in Fig. 5.
It willfalso be apparent from Fig. 6 that each
of `the-relays PS and NS have similar stick cir
cuits controlled by the contacts 29| and 293 of
V20 the relays S01 and LV1 respectively.
Reception of route control coda-Let us as
sume- that the operator has operated the en
trance button INB and the exit button ZXB pick
ing up the route relay |-~2" and therefore caus
ing the transmission of the code No. 3 in the
ltypical code table, The first three impulses in
this code select the station, as above pointed out,
causing'the station selecting relay S01 to be
maintained up only at this particular field sta
30 tion for the cycle of operation under considera
tion, and during the last four impulses of which
the relays APS, 5PS, BNS and TPS are respectively
picked vup and maintained picked up until the
picked up by a stick circuit closedïïfrom (+),
through a circuit including front contact 3|?)` of
relay WN, back contact 3|6 of relay WR, upper
winding of relay WN, to (_). This stick circuit
maintains the relay WN in a picked> up condi- I
tion until the reverse switch control relay WR
is picked up for some other route in response to a
route relay, such as relay 4»-2R, or in response
to the reception of an emergencyswitch control
code as will be explained hereinafter.
With the relay WN picked up, the normal
switch machine control circuit is closed` from
(-I-),'through a circuit including front contact
3|T of track relay |5T, front contact 3i8 of track
relay IlIT, front contact 3I9 of lock relay L, back
lay WN, through the switch machine SM, to (Í-)`.
'I‘his causes the normal operation of the switch
machine SM and the operation of the crossover
TS to normal positions which is repeated by `the 20
. relay WP.
-With the crossover TS in a normal position,
either when it has been in such position initially
or when it has just operated to such position, a
circuit is closed for energizing the‘signal con»
trolling relay IG from (+), through a circuit
including front contact 322 of relay WP, polar
contact 323 of relay WP in a left-hand normal
position, front contact 324' of route relay |‘-2R,
winding of relay IG, to (-) .
to clear so that a train may proceed over the route
735 the last stepping relay LV1, at which time the
code set up by these relays is executed to the
proper route relays for controlling the trañîc
controlling devices.
Vent the `operation ofthe switch machine during
With this code set up upon the decoding re
um: lays, an execution circuit is closed during the time
that the last stepping relays LV1 is picked up sub
sequent to the dropping of the slow acting relay
SA1. It will be apparent from Fig. 5 that this
time period will be equal to the dropping away
time of the relay LV1. This execution circuit for
the particular code assumed to be set up is closed
from (+), through a circuit including back con
"- 50
tact 300 of relay SA1, front contact 30| of relay
LV1, back contact 302 of relay ANS, back con
tact 303 of relay 5NS, back contact ‘300 of relay
SPS, back contact 305 of relay TNS, front con
‘tact 306 of relay APS, front contact 30T of
relay EPS, front contact 308 of relay ENS, iront
contact 309 of relay TPS, wire 3I0, back con
tact 3|| of routeV relay 2-lR, lower winding `of
route relay |-2R, to`(-).
' .
As soon as the route relay |-2R picks upyit `is
maintained picked up by a stick’ circuit closed
from (+), through a circuit including back con~
"60 tact 3|2 of stop route relay I-ZS, front contact
3|3 of route relay l-2R, upper winding of route
relay |-2R, to (_).
Thus, at the end of the execution period and
the opening of the execution circuit just pointed
out, all of the decoding relays PS and NS drop
away to their normal positions, but the route re~
lay |-2R remains picked up due to its stick cir
cuit so as to set up its route and clear the signal
for such route.
The picking up of the route relay |-2R closes
>an’energizing circuit for the normal switch con
trolling relay WN from (+) , through a circuit
including front contact 3|ll of route‘relay |-2R,
bus' wire 345, lower winding of relay WN, to (_).
`When the relay WN is picked up,vit is maintained
The picking up of the contacts of the relay IG
changes the indication of the signal I from stop
from signal I to signal 2 on to the end of such
route. While the signal I is cleared, the locking
relay L is deenergized in> accordance with the
, end of the cycle of operation and the dropping of
., 1:5
contact 320 of relay WR, front contact 32| of re--
usual practices for locking a route so as to pre
such a clearing condition of the route. Also,ithe
passage of the train over the track section MT,
deenergizes the track relay MT opening» front
contact 3|8 so as to further insure the continued
locking of the switch machine SM, although the
signal is either automatically or manually putÍ to
In this connection, it is to be understood that
the signal I may be entirely under manual con
trol as shown in the present disclosure, or it may
be a semi-‘automatic signal, that is, a signal‘au
tomatically put to stop by the passage of a train. -50
It is also to be understood that this signal I and
the other signals of the disclosure may be of the
stick signal type, that is, put to stop by the pas
sage of a train, and incapble of being cleared un~
til both a stop and a clear control has again been
received. This may be accomplished in> any of
the usual ways provided in signalling practice.
But for the purpose of simplicity in the present
disclosure, manual control onlyr is provided for
putting the signals to stop.
More specifically, the signal I is returned to its
stop condition by the transmission over the sys
tem of the stop code in the response tothe return
of the route relay I~-2 to a deenergized condition,
as previously pointed out.
This stop route code No. 13 sets up the code (_)
(-) (-l-) (+) on the decoding relays PS and NS
so that an execution circuit at the end of the-
cycle of operation is closed for the stop route re
lay |---2S from (-i-), through a circuit including 70
back contact 300 of relay SA1, front contact 30|
of relay LV1, back contact 325 of relay 4PS, back
contact 326 of relay BPS, back contact 32T' of re
lay BNS, back contact 305 of relay TNS, front
contact 328 of relay 4NS, front 'contact 329 of Are
stop route relay |---2S, to (_).
7 and 8 are employed for the emergency opera
tion of the switch machine SM in response to the
manualy control of the emergency switch control
~ .
The stop route relay -|--2S, and alsoallI other
`stop route relays, such as relay 4-6S, are only
lever SML.
energized during the execution period, but this
cient period of time to drop out any of the route .
vrelays with which it is associated. For example,
the stop route relay |-2S controls the route '
15 gizing relay IG upon the opening of front’con-y
tact 324.
It will be apparent from' the above description
that the transmission of any'of the other route
control codes as assigned in the typical 'code table
20 »will cause the picking up of the corresponding
route control relay `and cause Vthe setting ,up~ of
the proper route and the clearing of its signal.
Therefore, theremaining `execution circuits for
the route relays will not be pointed out in detail.
code No. '7 is transmitted and stored _in the decod
ing relays PS and NS. rThis will setup an
executing circuit at the end of the cycle from
stop route relay up and it remains up for asuiii
relay |-2Rv and opens its stick circuit-at back
contact 3|2 and allows this route relay I-ZR-to
`drop away putting to stop the signal by deener
Let us assume that the reverse switch operating
period of energization is suilicient for picking the
2,121,847 '
layäNS, front >contact 330 of relay yGPS_,iront
contact 33| of'relay'lPS, wire 332,v windings of
(-|-) , through a circuit including back contact 300
of relay SAl, front contact 30| of relay LV1, back 10.1
Contact 302 ofr relay'4NS,V back contact 326 of
relay 5PS, back contact 304 of relay SPS, back
contact 305 of relay -INS, front contact 335 of
relay llPS, front contactl 336 of relay 5NS, front
contact 331 of relay GNS, front contact 338 of 15
-relay 1PS,.wire 339, lower winding of relay WR,
to ‘ (,-).
This circuit energizes the relay WR
causing >the relay WN to be deenergized and
close the stick circuit’for the relay WR previously
pointed out.> This will eiTect the operation of 20y
the switch machine SM providing it is unlocked
and no signal hasvbeen cleared. If the relay .WN, ,
for example, is energized vby reason-of the closed
condition »of front contact 3|4 of route relay
25 However, it is considered well to note that the f |-2R previously picked up for'clearing a route,
picking up of the route relay 4_-2R for example, then the relay WR will be only momentarily ener
closes front contact 333_which- will energize the v gized during the execution period and will again
lower winding of the relay WR through an ob
drop away as the relay` WN `is permanently held
vious circuit. The picking up of the _relay WR by th-e energization ofrits lower winding so long
30 opens contact 3|6 to deenergize the stick circuit
for the relay WN and closes its own stick circuit
from (-f-) , through a circuit including front con
tact ‘3|6, yback Contact 3|5 of relay WN, upper
winding of relay WR, to (_). The closure of
Iiront contact 320 of relay WR and back contact
32| of relay WN causes the reverse operating cir
cuit of the switch machine SM, which will cause
other of the route relays were picked up requiring
the crossover TS to be in a normal position.«
Let us assume that the normal switch'operat- ,
executing circuit at the end of they cycle from
(-1-), through a circuit including back contact 300
which is repeated by the switch position repeat
of >relay SA1, front contact 30| of `relay LV1, back
contact 302 of relay 4NS, back contact„326 of
relay 5PS, back contact 304` of relay GPS, back
ing-relay WP.
' causes the energization of the signal clearing re
lay 5G for changing the indication of signal 5
from clear to stop, but this energizing circuit for
45 the relay 5G requires the switch position repeat
ing relay WP to indicate that the crossover TS is
in a reverse position before this circuit vcan be en
. In brief, it will then be understood from this
operation, that each route control code‘ not only
causes the operation of the switch (or switches)
in the associated route and the clearing of. the
Contact 340 of relay '|PS,.front contact 34| of
relay 4PS, front contact >342 of relay 5NS, front
contact 343 of relay GNS, front contact 344 of
relay -HNS, wire 345, lower winding of yrelay WN, 45
to (-). This vcircuit energizes the relay WN
causing the >stick circuit for the relay WR to be
broken and close its own stick circuit previously
pointed out, providing of course that no route
relay is holding the relay WR energized such as, 50i'
for example, th-e closed condition of Írontcontact
333 of the route'relay 4-2R. The control ofthe
signal Afor that route, but requires that the track
' .relay WN under such circumstances will be _similar `
switch' (or switches) controlled thereby shall be
in proper positions and have responded to their
to that pointed out in connection with the
relay WR.
controls properly >before a signal can be cleared
for that route. There is a route relay such as
controlling system of >the‘entrance-exit inter
|-2R, 2--|R, 4-6R, etc. foreach of the routes.
locking type as one specific >embodiment of the
Also, each route may include a single track switch
60 Ior a plurality of track switches and Crossovers
although the present disclosure of Fig. 7 merely
shows a single crossover.
In such cases wherev
a plurality of track switches are,employed,.the
particular routerelay picked up controls all of
65 ithe WN or WR relays for all of >the track switches
involved in the route which that route relay
governs and the signal selecting circuits for con
trolling the signal relays G require that all of the
v track switches be in their proper operated posi
tionsbefore the proper relay G can respond to the
energized -condition of the route relay for that
Reception o-f emercencyswitch control code.
As above described, vand with reference to the
Ytypical code table, it will be seen that code Nos.
ing code No. 8 is transmitted and stored in the 35
decoding relays PS and NS, this will set up ank
the crossover TS to operate to a reverse position
The front contact 334 of route relay 4-2R
as the route relay y|--2Rl is` picked up. Itwìll be
apparent that the same condition exists if any
55 I
Having thus described a centralized traflìc` , '
present invention, it is to be understoody that
various modiñcations, adaptations, and altera
tions may be applied to meet the requirements of
practice without in any manner departing from
thev spirit or scope ofthe invention except as
limited by the appended claims.
1. In a centralized trañìc controlling system .
What I claim is:
for railroads, a track layout containing a plural
ity of track switches operable to normal and
reverse positions to form a plurality of routes,>vl
signals for governing traiìc yover said routes, a 70
code type communication system connecting a_
control oflice with said track layout, control but
tons in said control ofñce designating the ends of
said routesv through said track layout, means re
sponsive to the joint operation of the ‘- control 75
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