standard symbols for railway signal...

STANDARD SYMBOLS.

FOREWORD.

LITTLE more than four years ago the Signal Companies united

"' in compiling and publishing a standard code of symbols for the re

presentation of apparatus on signal plans. This code was con·

sidered fairly adequate for the demands of that time and was quite

universally adopted. Since that time the growth of railway signaling has been

so extensive that all have come to realize that advancement must be made in the graphic representation of signal apparatus as well as in the apparatus

itself. Railroad Companies as well as Signal Companies have, therefore,

been forced to the adoption of certain special symbols to supply their own

demands. Thia sort of procedure naturally results in confusion. The Manu

facturing companies, realizing that they are more seriously affected by this

confusion than the railroad companies, and knowing that very little attempt has

been made toward bringing about concerted action in this matter, therefore,

recently called together a committee composed of one representative from

each Signal Company to revise the book issued in 1906.

This committee realized the importance and difficulties pertaining to their

task, and it can be truly said that no time, or effort has been spared in their

attempt to develop a scheme that will be, not only adequate, but practical.

Much emphasis has been placed upon the importance of simplicity from

a drafting standpoint. It has . also been the purpose throughout to produce

a systematic scheme that will be logical and easy · t.o read. Arbitrary features

have been avoided as far as possible, and the committee has sought to avoid

any more radical changes from former practice than are absolutely necessary.

After the Manufacturers' Committee had spent about six months on the

subject, having held no less than seven meetings in that time, at their request

joint meetings were held with R. S. A Sub-Committee No. 1. Valuable

suggestions were presented as a result of these joint meetings. Revisions were

made accordingly and the subject was presented to the Railway Signal Asso

ciation for consideration at their March, 19 I I , meeting in Chicago. Again

suggestions of great value were brought forward by various members of the

Association. Soon after the Chicago meeting the Manufacturers' Committee

again met in jo.int session with R. S. A. Sub-Committee No. I . The various

suggestions were carefully considered and adopted as was thought best.


2 STANDAR.D SYMBOLS-(Continued)

A few words of a general nature in regard to the symb~ls will be suffi

cient. Pages 4 and 5 have to do with symbols for signals. On account of

the recent development, not only in methods of control, but al~o in the num

ber of indications which signals are made to display, it is here that the most

changes have become necessary. It will be noted on that the hori

zontal column of characteristics, which might be termed the characteristics of

operation, are grouped under six headings, with a seventh to cover special or

unusual features.

By "non-automatic" signal is meant a signal which is in no way con

trolled by a track circuit, while "automatic," of course, refers to a signal, the

primary control of which is the track circuit, or, perhaps more properly, it is a signal which automatically gives indication in regard to the integrity of the

track through its block. The term "slotted" is only made to cover a mechani

cal signal equipped with an electric slot. A "semi-automatic" signal is taken

to be a manually controlled automatic signal and may, or may not, be inter

locked. As to whether it is, or is not, interlocked will be apparent from its

position on the plan and its relation to other signals. It is to be understood

that this. manual control is direct and that a signal is not to be considered

"semi-automatic" because some feature of its control is dependent upon an

other· signal which is manually controlled. By "stick semi-automatic" signal

is meant a semi-automatic signal which will not clear automatically after it has

been put to stop by interruption of the track circuit until the manually operated

device controlling it has been restored to normal and reversed again. A

"non-stick semi-automatic" signal is taken to be a signal which will operate

automatically as long as all contacts {lever, signal controller, etc.) other than

track relay contacts, affecting its control are closed.

Again, referring to Page 4, it will be noted that the vertical column of

characteristics has to do with the positions which the signal is capable of as

suming. In "three-position" signaling these characteristics are represented by

lines, which are not necessary in the case of "two-position" signaling. The

distinction between "two-position" signaling and "three-position" signaling

should not be lost sight of. 'Two-position" signaling is understood to include

signaling where a distinctive arm is used to display the distant indication, while

"three-position" signaling includes signaling where one-arm may give both the

home and distant indications. '

Referring to the 0° to 90° signal m "three-position" signaling, it will be


STANDAR.D SYMBOLS-(Continued)

noted that this is distinguished by a vertical line, meaning that it is capable

of moving from the horizontal to the vertical. When this signal is shown on

the plan in the 90° position, it has the line drawn in the same position with

respect to the outline of the blade, but is horizontal with respect to the signal

mast, and, therefore, indicates that the signal _is capable of moving from vertical

to horizontal. The 0° to 45 ° signal has a diagonal line sloping downward

· from the signal mast. This indicates that the signal moves from the horizontal

to the diagonal. Where the signal is shc:iwn in the 45 ° position, the same

line means that it moves to the horizontal. The symbol for 45 ° to 90°

signal has the line in the reverse position, and the symbol for the signal taking

all three positions-0°, 45° and 90°-has both of these lines. Theoretically,

these lines should be drawn at an angle of 45 ° from the comers of the signal

arm, but for simplicity in drafting, they are drawn from comer to comer. It will be noted that the symbol for the fixed arm is absolutely in accordance

with the same basic principle.

The committee is thoroughly aware of the fact that there are a great

number of dilferent conditions that may enter into the control of a signal ; in

recognition of this fact, the column headed "Special-Requires Reference to

Notes" has been provided. Also two of the more generally used special con

ditions of control are covered by the two special symbols E24 and E25.

Other features having to do with signal symbols are shown on

and need no explanation. The remaining pages, covering "Location Symbols"

and "Symbols for Circuit Plans", are self-explanatory. Special mention

might be made of Page 12-"Circuit Controllers Operated by Levers". An attempt has been made to bring about uniform practice along this line. Here

tofore no uniform scheme has been followed. In order to afford as large

latitude as possible, both letter symbols and graphic symbols have been pro

vided. Letters have been assigned to the basic positions over which a lever

passes-full normal, normal indication, central, reverse indication, and full re

verse, and these letters are to be combined to form the symbols for the "Letter

System". Graphic symbols for each of these positions are given, by combina

tion of which all necessary symbols may be derived for the "Graphic System".

The Committee, therefore, respectfully submits this matter to all those

interested in railway signaling and asks for hearty co-operation in its universal

adoption.


4 SYMBOLS FOR SIGNALS

NON - AUTOMATIC. SEM1-AuTOMAT1i;. SPEGIAL OPERATING. SLOTTED.

(POWER.) AUTOMATIC REQUIRES

MEGHANICAL POWER (MECH.) STICK. NON-STICK (POWER) REFERENCE TO NOTES.

~.,,,cs ~ r--~ 1---1 ·--, H~~J 1----, f-01 ___ J I I

!-..'<) r---J r--- 1----~ t"-----l

I I I I I I I ' : I I 2 I 3 I 4 I 5

I 6 ' 7 <.> I I I I I I

Two 2-POSITION. ~---,

~ R, r: ~ ~ Rs I 0A~ POSITION 0T060·0T010 I ' t----J

0T015•0T090 , I

SIGNALING. I A I

2-POSITION. L.r, p; F! F;

f.4 ~ ~ p; L- _J OTO 90 I

: B

2- POSITION. tsJ ~ ~ F: ~- ~ ~ ~ ' ,.. THREE 0T045 I

I G POSITION

I

SIGNALING. t' ~ ~ ~ ~ ~ tf. ~ 2-POSITION. k' ,> 45TO 90 ' '

: D

3- POSITION. ~ ~ ~ ~ ~ ~ ~ F.; 0 T045To90 ' ' E '

NOTE: ARMS SHOULD ALWAYS BE SHOWN IN NORMAL POSITION.

l1z! SPECIAL - 3 POSITION NON-AUTOMATIC , 0 TD 45.

SEMI -AUTDMATlu STICK , 45 TO 90 •

~I SPECIAL- 3 POSITION NON-AUTOMATIC, OTO 45.

SEMI-AUTOMATIC NON-STICK, 45TO 90.

p ABSOLUTE STOP SIGNAL. p DISTANT SIGNAL. I I

' I I I

b PERMISSIVE STOP SIGNAL. tr· TRAIN ORDER SIGNAL • I

: I I

I I

ENDS OF BLADES IN SYMBOLS ARE TD BE OF THE ACTUAL FORMS USED BY THE ROAD CONCERNED. IF NOT SPECIFIED THE ABOVE FORMS WILL BE USED ON PLANS.

~---, Fll'-ED ARM. r-----' 2

I i.1 i.. Li+!-+.!.+. Li.!,+. ti.!. I 4 4444444

_____ ,

I I UPPER QUADRANT SIGNAL. I I~ ~ ~31 i-----.J

: }'. 1----, ?

~ " ~----J LOWER QUADRANT SIGNAL. f / Y3 I ' l ' } ~' I) ~ 1•

~----, ~3 ' I VERTICAL I ..,. ____ _.

:o MARKER LIGHTS. DIAGRAMS OF PROPORTIONS FOR MAK-~-----;

STAGGERED ING SYMBOLS FOR SIGNAL BLADES • ~----.!

o:

PLATE 1. Downloaded from http://PRR.Railfan.net - Collection of Rob Schoenberg - ©2020 - Commercial reproduction or distribution prohibited

GROUND MAST.

SYMBOLS FOR SIQNALS-(Continued)

GROUND MAST WITH OFFSET BRACKET ATTACHMENT. BRACKET POST.

~-----, r---.., I I I I j-- --...J r--- - ...J

BRACKET POST.

5

1-., __ J

SUSPENDED

MAST.

? RING ENCLOSED CHARACTERISTICS MEAN LIGHT SIGNAL ONLY. '

----~ _______ J_ __ _

j_ SMASH SIGNAL

POT SIGNAL.

DISC SIGNALS.

1 1 1 1 1 HOME

PROCEED. HOME STOP.

DISTANT PROCEED

DISTANT CAUTION.

DOUBLE FUNCTIONED.

-I I PRESENT SIGNAL TO BE REMOVED •

' ...!...

l-----, I I ._ ___ _J

I

' ' PRESENT SIGNAL TO REMAIN.

I ..J...

RELATION OF THE SIGNAL TO THE TRACK AND THE DIRECTION OF TRAFFIC •

n ...._......_ __ -11 RIGHT HAND LOCATIONS. D RIGHT HAND SIGNAL. LEFT HAND SIGNAL.

LEFT HAND LOCATIONS. -----~-------~ ------~------~

D D RIGHT HAND SIGNAL. LEFT HAND SIGNAL.


6 LOCATION SYMBOLS

INSULATING RAIL JOINTS.

TRACK CIRCUITS IN BOTH DIRECTIONS.

IMPEDANCE BOND.

CJ

, , ;J

TRACK CIRCUIT ON LEFT, NONE ON RIGHT.

TRAFFIC DIRECTION •

-STATION. GROSSING GATE.

F F L

TRACK CIRCUIT ON RIGHT, NONE ON LEFT

TRAGK PAN.

~

(UNLESS OTHERWISE SPEGmED.)

SIGNAL POWER STATION.

SIGNAL SUB-STATION.

4S

1 J ( 1 l D ( ~-----~ ----- •

MILE POST. TUNNEL. BRIDGE OR VIADUCT. DRAW BRIDGE. LIFT BRIDGE.

NOTE: STATE WHETHER DECk. HALF-THROUGH OR THROUGH BRIDGE.

==F=+==f==#== ii OVERHEAD SIGNAL HIGHWAY RAILWAY' PROPOSED RAILWAY

BRIDGE. BRIDGE. CROSSING, CROSSING. CROSSING. NOTE: SPECIFY WHETHER STEAM OR ELECTRIC RY.GROSSING •

• MAIL CRANE. WATER TANK. WATER COLUMN. TRACK INSTRUMENT. TORPEDO MACHINE.

TRAIN STOPS.

~ ~ ~ ~ ~ STOP.

~ ~ ~ ~ E:8 CLEAR.

NON-AUTOMATIC. SLOTTED. SEMI- AUTOMATIC. MECHANICAL. POWER. AUTOMATIC.

I :::7 DO

POWER SWITCH MACHINE.

±~b?# INSULATED TURN-OUT ELECTRIC

SWITCH Roo. AND SWITCH STAND. SWITCH LOCK.


LOCATION SYMBOLS-(Continued)

1!3---CAPACITY Q] RELAY Boll. JUNCTION Box. TERMINAL BOll. LIGHTNING ARRESTER

Box.

RELAY BOX CAPA~ CHUTE CAPACITY l

@-CAPACITY

BATTERY CHUTE • RELAY Box AND POST. BATTERY CHUTE, RELAY Box ANO POST COMBINED.

NOTE : TYPE OF INDICATOR

SWITCH Box LOCATION ' SWITCH INDICATOR.

TO BE COVERED BY GENERAL NOTE,

SWITCH INDICATOR AND SWITCH Box.

GABLE POST WITH ONE WITH Two WITH RELAY WITH RELAY Box AND ONE INDICATOR.

WITH RELAY Box ANO Two INDICATORS.

ONLY. INDICATOR. INDICATORS. Box.

N ABOVE SURFACE.

HIGHWAY GROSSING BELL •

. ID HALF ABOVE SURFACE. HATTERY SHELTER.

ID BELOW SURFACE •

(FIGURES INDICATE CAPACITY)

PLATE 4.

{

:!:: ---.=

OR --~B--

TRACK BATIERY.

7


'.

8 LOCATION SYMBOLS-(Continued)

INTERLOCKED SWITCHES AND DERAILS •

& ~ SWITCH-SET FOR TURN-OUT, SWITCH- SET FOR STRAIGHT TRACK.

DERAIL- POINT TYPE-DERAILING. DERAIL- POINT TYPE-NON-DERAILING.

e---DERAIL - LIFTING RAIL TYPE-DERAILING • DERAIL- LIFTING RAIL TYPE-NON-DERAILING. ... DERAIL - LIFTING BLOCK TYPE-DERAILING. DERAIL- LIFTING BLOCK TYPE-NON-DERAILING.

NOTE: NON-INTERLOCKED SWITCHES AND DERAILS TO BE SHOWN SAME AS ABOVE EXCEPT SHADING IN TRIANGLES OMITTED.

RUNS OF CONNECTIONS. /

/ BOLT LOCKS. ,,,,,.,, /

E3 ----------r-~::::::;/-:-' -- I-WAY. ~~-------

PIPE-WIRE (MECH.).

DETECTOR BAR. I I BLd 2-WAY.

E3 I

WIRE DUCT.

COMPRESSED AIR. BoLT LOCKED SWITCH. 3-WAY.

S.L.M.=SWITCH &.LOCK MOVEMENT. CRANKS.

~ f.P.l!'FACING POINT LOCK.

-A./'.-COMPENSATOR. ~ ~

r

ARROW INDICATES DIRECTION OF MOVEMENT OF PIPE LINE- =?fl NORMAL TO REVERSE .•

~

PIPE-WIRE ANO DUCT.

---------PIPE - WIRE AND AIR.

··.0--·········-·····0···············--0H············ DUCT AND AIR.

----·--·-----·-PIPE-WIRE, DUCT AND AIR. OIL ENCLOSED PIPE LINE. 3-WAY.

~ MAN-HOLE.

TRACK

r>T<J. INTERLOCKING OR BLOCK STATION. ~ SHOWING REUTIVE POSITION OF STATION,OPERATOR ANO TRACK. ~

OPERATOR FACING TRACK. OPERATOR WITH BACK TO TRACK. NOT£: UNLESS OTHERWISE SPECIFIED ON PLAN IT Will BE ASSUMED THAT WHERE AN

INTERLOCKED SIGNAL IS SHOWN CLEAR OR A DERAIL SHOWN IN NON-DERAILING POSITION THE CONTROLLING LEVER IS REVERSED, AND. THAT ALL OTHER LEVERS ARf NORMAL •.


LOCATION SYMBOLS-(Continued)

INTERLOCKED SWITCHES, DERAILS, ETC.

I - SIMPLi TURN-OUT. 2 - SIMPLE CROSS-OVER. 3- DERAIL-POINT 0 TYPE.

4- SINGLE SLIP SWITGH.

PIPE LINE.

WIRE LINE.

DOUBLE LINE

SINGLE LINE PLAN •

EXPLANATION

7 M.P.F.

5 - DOUBLE SLIP SWITGH • 6- MOVABLE POINT CROSSING FROG. (M.P.F.) 7 - SINGLE SLIP SWITGH WITH M. P. F.

8 - DOUBLE SLIP SWITGH WITH M.P.F.

ROCKING SHAFT LEAD-OUT. ---- ----

c U WHEEL.

I - -- - -- I 1234 6789

CRANK LEAD-OUT.

2-WAY GRAN!<..

4-WAY CRANK.

3 4 VERTICAL CRANKS.

DEFLECTING BAR LEAD-OUT.

9

HORIZONTAL DEFLECTING BARS.

123 678 VERTICAL DEFLECTING BARS.


10 SYMBOLS FO~ Cl~CUIT PLANS

RELAYS, INDICATORS AND LOCKS • ELEMENTS OF SYMBOLS g TO BE COMBINED AS LJ 0 • C • ELECTRO MAGNET.

NECESSARY,

-..--r . ' ' ' .1.--.L. ~ .,. .. ,.

N

... --· I I o I

]~ t

Ll1 T--T

L_l! ~

.,.--r t-1 ·--J.

~f ~f ~-e ~-~ I t I t f t I I I t I I I I I t ~--'- ~-.... .... __ ,. ~- -~

-0-

r-·r 1--r -r--r 'T--; I I I I I I I I

~~-0~

A. C. ELECTRO MAGNET.

COIL ENERGIZED OR DE-ENERGIZED •

NEUTRAL FRONT CONTACT - CLOSED OR OPEN.

NEUTRAL BACK CONTACT - CLOSED OR OPEN.

POLARIZED ARMATURE - WITH CONTACTS •

3 - fOSITION ARMATURE - WITH CONTACTS •

HIGH CURRENT CONTACT.

MAGNETIC BLOW-OUT CONTAGT.

BELL ATTAliHMENT •

DOUBLE WINDING-SPEGIFY IF DIFFERENTIAL.

SLOW AGTING •

D1sG TYPE INDICATOR. O=D1sc INVISIBLE. •=DISC VISIBLE.

SEMAPHORE TYPE INDICATOR. j = 3-POSITION.

WIRE WOUND ROTOR •

... --;or

STATIONARY WINDING. J,?~.,L =HIGH VOLTAGE WINDING.

ELEOTRIC LOCK- SHOW SEGMENTS FOR LEVER IN NORMAL POSITION.

(SEE NEXT PAGE FOR EXAMPLES OF COMBINATIONS.)


SYMBOL FOR. CIR.CUIT PLANS-(Continued) 11

RELAYS , INDICATORS AND LOCKS. EXAMPLES OF COMBINATIONS •

0.G. RELAY- NEUTRAL - ENERGIZED -

ONE INDEPENDENT FRONT CONTACT CLOSED -ONE INDEPENDENT BACK CONTACT OPEN.

D.C. RELAY- POLARIZED- ENERGIZED -

Two COMBINATION FRONT AND BACK NEUTRAL CONTACTS -

Two POLARIZED CONTACTS CLOSED -Two POLARIZED GONTAGTS OPEN.

0. C. INDIGATOR - SEMAPHORE TYPE- ENERGIZED -

THREE FRONT CONTACTS CLOSED -

BELL ATTACHMENT•

D. G. INDIGATOR - SEMAPHORE TYPE - ARM HORIZONTAL

ENERGIZED - WITHOUT CONTACTS. NOTE: INDICATORS (OR REPEATERS) WITHOUT GONTAGTS SHOULD BE SHOWN

WITH ARMATURES TO INDICATE WHETHER ENERGIZED OR DE-ENERGIZED.

A.G. RELAY- ONE ENERGIZING CIRCUIT TYPE (SINGLE PHASE)

ENERGIZED - ONE FRONT CONTACT.

A.G. RELAY-Two ENERGIZING CIRCUIT TYPE- ENERGIZED -

WIRE WOUND ROTOR -Two NEUTRAL fRDNT CONTACTS •

A.G. RELAY-Two ENERGIZING G1Rcu1T TYPE- ENERGIZED -

WIRE WOUND ROTOR -Two POLARIZED CONTACTS •

A.G RELAY-Two ENERGIZING CIRCUIT TYPE"- ENERGIZED -

STATIONARY WINDINGS -ONE NEUTRAL FRONT CONTACT -

Two 3- POSITION GONTAGTS •

0. C. INTERLOGl<EO RELAY.

O.C. ELECTRIC BELL •

DESIGNATE RESISTANCE IN OHMS OF ALL D. C. RELAYS, INDICATORS AND LOCKS.


12 SYMBOLS FOR. CIR.CUIT PLANS-(Continued)

CIRCUIT CONTROLLERS OPERATED BY LEVERS USE EITHER LETTER SYSTEM OR GRAPHIC SYSTEM •

LEVERS WITH EXTREME END PoSITION AS NORMAL •

N-FULL NORMAL POSITION OF LEVER. 8-NORMAL INDICATION POSITION. G-GENTRAL POSITION.

0-REVERSE INDICATION POSITION. R-FULL REVERSE POSITION.

LETTER SYMBOL.

N c I

D I

R

GRAPHIC SYMBOL.

B I 'I

-®-+ : I I I I I I I

: '-I

-©- ! I I

: ~

-©- + i T -®-

I

t " I

-®- : ... .,, I I I I

_tUii\__ I I ~ ~+-j° I : ~-

I : I

-@-- : +--+ .;J I : :

-@- •:--.... , ! A

-@-! i I i 1 -®-! ! : r ___hoj:Q_ I I :

~ •• -+-1---..... ~ ·: I I

-@-: .. :--1- t) __!AC\_ l.A_..: ___ _,..1...-E .... ~I I l ~ _iAci\_ : A..l I ~I I I ~

-@- .: : IE I I ~ 11;;:] I I 1

~I .L..-1. I J ~I I : Zf

I I I l -@)- : : +--+ is: __fu';\_ w: l l "-~. 1: l --'RY'- ,

1

1 ,! : lL --t-1 ....... -

~ '!•

LEVERS WITH MIDDLE POSITION AS NORMAL ,

N-NORMAL POSITION.

L-FULL REVERSE POSITION TO THE LEFT. 8-INOICATION POSITION TO THE LEFT. 0-INDICATION POSITION TO THE RIGHT.

R-FULL REVERSE POSITION TO THE RIGHT.

LETTER SYMBOL.

L B N D R

GRAPHIC SYMBOL.

___{,\___ : I I I )c:._

-&+ I I l ~ I I I

-©- .L! !~ I I _____th__ -®- ..:. :~

--®- t I ® -®- ! i ~

I I

-®-+-+ I : ~ L.-l -©- I I @J

-®-- "'"'"'--+I f .®. -©---1 ! ~ -<®- I ~ -®-! ! ! ~ -@- ! +i---· --! w

I I I

-®-E •.A_..,'--....;.-~E: /AA I I I ~

--@- IA I AB :~ I /jl\ I I i>e'

-@ ! .... ~J ®i --IBN'- +-+ 4 ~ I I I ~ ___hoj:Q_ I I I ,.!.. ~ : -:---; ~

-®- ---.!l I l l@ ~ : : ::!..- -11@1--~ I!!'

NOTE: HEAVY HORIZONTAL LINES INDICATE PORTION OF CYCLE OF LEVER THROUGH WHHllt CIRCUIT IS CLOSED.


SYMBOLS FOR CIRCUIT PLANS-(Continued) 13

CIRCUIT CONTROLLERS OPERATED BY SIGNALS.

3-POSITION

SIGNALS.

0 0 60-70 OR

0 75 SIGNALS.

UPPER Q.UADRANT.

/

'

..... ; . ~./.

•··. : ..-•. / .• -r···:·. ./ . ~ ........

... ~ ..... .. .

..."' .... .. . GLOS;o.1: =1 ..... OPEN. ·--·

LOWER QUADRANT.

0

CLOSED AT 0 ONLY.

0

CLOSED AT 45 ONLY.

4!1 ... ~ ~ .. ::~

'"· ~ CLOSED AT 90° ONLY. ~_)t'

0 0 CLOSED 0 TO 45

0 0 CLOSED 45 TO 90

CLOSED AT 0° ONLY.

CLOSED IN CLEAR

POSITION ONLY.

'··-} : ', .....

•. '

l::t ::::1 SWITCH CIRCUIT CONTROLLER.

CIRCUIT CONTROLLER OPERATED BY LOGKIN6

MECHANISM OF A SWITCH MOYEMEHT.

fl. tti

e ) e CLOSED.

-----<·-- > • OPEN.

BRIDGE CIRCUIT CONTROLLER.

POLE CHANGING CIRCUIT CONTROLLER.

_)._ • t SPRING HANO KEY OR PUSH BUTTON. CIRCUIT SWITCH.


14 SYMBOLS FOR. CIR.CUIT PLANS-(Continued)

MANUAL TIME RELEASE• (ELECTRIC)

AUTOMATIC TIME RELEASE. {ELECTRiC)

ll

MANUAL TIME RELEASE • ( ELECTRO-MECHAN'L.)

EMERGENCY RELEASE • (ELECTRIC)

_.. e-J.

OPEN. CLOSED.

FLOOR PUSH. !.ATCH CONTACT. TRACK INSTRUMENT CONTACT,

KNIFE. SWITCHES.

! 7 1 n (I) (I) (I)

RHEOSTAT. SINGLE POLE. DOUBLE POLE. SINGLE POLE. DOUBLE POLE • SINGLE THROW. DOUBLE THROW.

II II 0UICiK ACTING CIRCUIT CONTROLLERS MAY BE DISTINGUISHED BY THE LETTER Q

--YVV0- -vJW- ~ FIXED RESISTANCE. VARIABLE RESISTANCE. fuse.

~ 000000 -c:::::J--IMPEDANCE WITHOUT IMPEDANCE WITH CONDENSER.

IRON GORE• IRON CORE.


SYMBOLS FOR CIRCUIT PLANS-(Continued) 15

BATTERY.

--+--~-+- -=-j1!1!1!1!1!1!i±-- Wm'""""' n -D.C.TERMINALS. CELLS IN MULTIPLE. GELLS IN SERIES.

SPECIFY TYPE ANO NUMBER OF CELLS. RECTIFIER.

0 =DRY BATTERY. l J l J G = GRAVITY ,, 0000000 0000000

P =POTASH " 5 = STORAGE "

( 0000000 l F1 F1 I-SECONDARY. 2·0R MORE SECONDARIES.

EXAMPLES: 16P, IOS, ETC. TRANSFORMERS.

® ® ~ D.G.MOTOR. D.G.GENERATOR. A.G. MOTOR.

~ ®--4) ~ A.G. GENERATOR. D.G.- D.G. MOTOR-GENERATOR. A.G.-0.G. MOTOR - GENERATOR.

--©-AMMETER. VOLTMETER. WATTMETER. TELEPHONE.

--0- f @ -=-SINGLE. • DOUBLE.

INGANOESGENT LAMP. LIGHTNING ARRESTER. TERMINALS.

! + J_ -+ WIRES GROSS • WIRES JOIN. GROUND.

II GOMMON II WIRE • OTHER THAN II GOMMON 11 WIRE.

TRAGK GIRGUIT WIRE. DIRECTION OF CURRENT.


~~&';?.47b.n/ ~A"'?'t'6f'.'.'.'~J""leF,,7ikffl,@n-P

Enoo

Superintendento

In collllection with my circular letters of December 21st and

January 7th, in t~e matter of maintenance by Superintendents Divisions

of right line plans showing switches, signals and certain other details:

You will probably note that the blue print showing general in ..

formation for the makillg up of the right line signal pla.11$ specifies

tlha:t n.s.a. Syri'iools shOuid. 'be used., We h.9-ve, therefore, secured a

supply and herewith ep.close a copy of such symbols, which are contain-

ed in a small pamplet entitled "Stendard Symbols for Railway Signal

mans - 1911 ...

General Superin.tendento


standard symbols for railway signal...

Documents