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CATECH/2000/S/AS/1.0

Maintenance handbook on March.2001Automatic signalling

1

CHAPTER 1

AUTOMATIC SIGNALLING

1.1 INTRODUCTION

Automatic block working is a system of train working inwhich movement of the train is controlled by the automaticstop signal. These signals are operated automatically by thepassage of trains in to through and out of the automaticsignalling sections.

1.2 FEATURES

Automatic block system

The line shall be provided with continuous trackcircuiting or axle counters.

Block section is divided into various small-signalling sections.

Each signalling section is governed by anAutomatic stop signal.

Each signalling section is further divided intoberthing and overlap track circuit.



2

1.3 ADVANTAGES

Line capacity increases.

Less dependence on human agencies.

Automatic stop signal can be passed at `ON' position asper General Rule 9.02 , after stopping one minute by dayand two minutes by night.

1.4 Automatic stop signal

Automatic stop signals are multiple Aspect colour light signals.( 3Aspect/ 4 Aspect stop signals)

Aspect of Automatic stop signal

are controlled by the movement of train.

Letter ‘A’ inblack on whitecircular disc

Fig no.1

A



3

Whiteilluminatedletter ‘A’ againstblackbackground

Numbering of signals -Normally odd nos. for up directionand even nos. for down direction.

Automatic stop signal is provided with `A' marker.

Semi Automatic Stop Signal

Semi Automatic stop signal can work asa manual stop signal/ Automatic stopsignal.

Semi Automatic signal is providedwith illuminated ‘A’ sign.

Illuminated 'A' sign will lit whensignal is working as Automatic stopsignal.

Illuminated ‘A’ signwill not lit whensignal is working asa manual stopsignal.

Controlled by king lever/ knob/switch.

Cascading arrangement- When a colour light signal isshowing a particular aspect and its lamp of that aspectfuses then signal becomes blank. To avoid this condition,cascading or cutting in arrangement in the lampcontrolling circuit is provided in such a way that if a lampfuses the signal can be restored to next restrictive aspect.Example. If green lamp fuses (when signal is displayingclear aspect), then the more restrictive yellow aspect can

Fig. No.2

A

CATECH/2000/S/AS/1.0 4

be lit or if yellow lamp fuses (when signal is displayingcaution aspect) then red aspect can be lit.

Red lamp protection: It is provided to avoid the passingof train in no light condition of a signal. In this case therear signal will show ON aspect, when signal ahead isshowing no light.

1.5 LEVEL CROSSING GATE IN AUTOMATIC


SIGNALLING SECTION :

LEVEL CROSSING GATE:

In Automatic signalling area, the signal controllingmovement over LC gate are semi-automatic signals. SemiAutomatic gate signal will be in "ON" position, when gateis open for road traffic.

Level Crossing Gate signal (when no point in the route)

Yellow circular disc with ‘G’ letter in black andilluminated ‘A’ letter against black background areprovided.

CATECH/2000/S/AS/1.0 5

Illuminated “A” sign of the Semi-Automatic gate signal will lit when thelevel crossing gate is closed against theroad traffic and signal is working as anAutomatic stop signal.

Letter ‘G’ in black on yellowcircular disc

white illuminated letter ‘A’against black background

A G

Fig no. 3

Maintenance handbook onAutomatic signalling

March.2001



6

Level Crossing Gate signal (whenpoints are in the route)

Illuminated ‘A’ and ‘AG’ sign areprovided on gate signal..

Illuminated “A” sign will lit when levelcrossing is closed against road trafficand points in the route are correctly setand locked and signal is working as anAutomatic stop signal.

Illuminated ‘AG’ sign will lit whenpoints in the route are correctly set andlocked and LC gate is defective andsignal is working as an Automatic stopsignal.

1.6 Lamps mostly used in colour light signal aretabulated below:

SR.NO.

REF.TYPE

RATINGVOLT/WATT

PURPOSE

1. SL18 12V/24W 2 pole single filament for OFFaspect.

2. SL 21 12V/33W 2 pole double filament for ONaspect.

3. SL33 110V/25W 2 pole single filamentdirection type route indicators.

4. SL35 A 12V/24W Triple pole double filament

A AG

Fig no. 4



7

parallel for OFF aspect.

5. SL35 B 12V/33W Triple pole double filament inparallel of same capacity forON aspect.

CHAPTER 2

AUTOMATIC SIGNALLING CIRCUITSAutomatic signalling circuits are mainly of two type i.e.Siemens and Q series type.

2.1 SIEMENS TYPE

a) Circuit with Mini Relay Groups ( Provided in Autolocation )

S1 S3 S5 S7 S9 1 T 1AT 3T 3AT 5T 5AT 7T 7AT 9T 9AT

Fig No.5

I. When the train is on 1 AT and signal S3 is showing greenaspect. The relay status for signal S3 shall be as under:

Relay Status Relay Status Relay StatusS3 RECR S3 HHATPR S3 DRS3 HECR S3 PR S3 BRS3 HHECR S3 DECPR 3 TPR



8

S3 DECR S3 DHHECPR 3 ATPRS3 HATPR S3 HECPRS3 TPSR S3 HHRS3 DATPR S3 TCR



9

S1 S3 S5

1T 1AT 3T 3AT 5T 5AT Fig No.6

II. The train passes signal S3 and occupies 3T (Train isoccupying 1AT and 3T). Signal S3 will show red aspect.The relay status for signal S3 shall be as under:

Relay Status Relay Status Relay StatusS3 RECR S3 HHATPR S3 DRS3 HECR S3 PR S3 BRS3 HHECR S3 DECPR 3 TPRS3 DECR S3 DHHEPCR 3 ATPRS3 HATPR S3 HECPRS3 TPSR S3 HHRS3 DATPR S3 TCR

S1 S3 S5


III. The train has cleared 1AT and occupied 3 T only. Therelay status for signal S3 shall be same as previouscondition II.



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S1 S3 S5


IV. The train occupies 3T and 3AT. The relay status forsignal S3 shall be as under:


S1 S3 S5


V. The train has cleared 3T and occupied 3AT only. The relay status for signal S3 shall be as under :




11

S1 S3 S5

1T 1AT 3T 3AT 5T 5ATFig No.10

VI. The train passes signal S5 and occupies 5T (Train is on3AT and 5T). Signal S5 will show red aspect. The relaystatus for signal S3 shall be same as previous conditionV.

S1 S3 S5

1T 1AT 3T 3AT 5T 5AT

Fig No.11 VII. The train has cleared 3AT and on 5T only. The relay

status for signal S3 shall be as under :


CATECH/2000/S/AS/1.0 12

S3 S5 S7 S9

1AT 3T 3AT 5T 5AT 7T 7AT 9T Fig No.12

VIII. The train occupies 5AT. (Train is on 5T and 5AT). Therelay status for signal S3 shall be same as previouscondition VII.

S3 S5 S7 S9

5AT 7T 7AT 9T ig No.13

1AT 3T 3AT 5T F

d occupies 5AT only. Signal S3pect. The relay status for signal

IX. Train has cleared 5T anwill display yellow as


S3 shall be as under :




13

Fig No.14

X. The train passes signal S7 and occupies 7T (train is on5AT and 7T). Signal S7 shows red aspect. The relaystatus for Signal S-3 shall be same as previouscondition IX .

S3 S5 S7 S9

1AT 3T 3AT 5T 5AT 7T 7AT 9T

Fig No.15XI. The train has cleared 5AT and occupying 7T only. The

relay status for signal S3 shall be same as previouscondition IX .

S3 S5 S7 S9


XII. Train occupies 7AT (train is on 7T and 7AT). The relaystatus for Signal S-3 shall be same as of condition IX .

S3 S5 S7 S9

1AT 3T 3AT 5T 5AT 7T 7AT 9T



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S3 S5 S7 S9


XIII. Train has cleared 7T and occupies 7AT only. SignalS3 will display Double Yellow aspect and signal S5will display yellow aspect. The relay status for signalS3 shall be as under :

Relay Status Relay Status Relay StatusS3 RECR S3 HHATPR SDRS3 HECR S3 PR SBRS3 HHECR S3 DECPR TPRS3 DECR S3 DHHEPCR ATPRS3 HATPR S3 HECPRS3 TPSR S3 HHRS3 DATPR S3 TCR

S3 S5 S7 S9


XIV The train passes signal S9. Signal S9 shows red aspect.(Train is on 7AT and 9T). The relay status for Signal S3shall be same as previous condition XIII .



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S3 S5 S7 S9


XV. Train has cleared 7AT and occupies 9T only. Therelay status for signal S-3 shall remain same asprevious condition XIV.

S3 S5 S7 S9

1AT 3T 3AT 5T 5AT 7T 7AT 9T 9AT Fig No.20

XVI. Train occupies 9AT ( train is on 9T and 9AT). Therelay status for Signal S-3 shall remain same asprevious condition XV.

S3 S5 S7 S9

1AT 3T 3AT 5T 5AT 7T 7AT 9T 9ATFig No.21

XVII. Train has cleared 9T and occupies 9AT only. SignalS-3 will display Green aspect, signal S-5 will displaydouble yellow aspect and signal S-7 will displayyellow aspect. The relay status for signal S-3 shall beas under :



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17

S1 S3 S5 S7 S9

1 T 1AT 3T 3AT 5T 5AT 7T 7AT 9T 9ATFig No.22

RELAY STATUS FOR DIFFERENT TRAIN MOVEMENT INAUTOMATIC SIGNALLING

Posi

tion

ofTr

ain

S3 R

ECR

S3 H

ECR

S3 H

HEC

R

S3 D

ECR

S3 H

ATP

R

S3 T

PSR

S3 D

ATP

R

S3 H

HA

TPR

S3 P

R

S3 D

ECPR

S3 D

HH

ECPR

S3 H

ECPR

S3 H

HR

S3 T

CR

S3 D

R

S3 B

R

3 TP

R

3 A

TPR

Rem

arks

1AT ↓ ↓ ↓ ↑ ↓ ↑ ↑ ↓ ↑ ↑ ↑ ↓ ↓ ↓ ↑ ↑ ↑ ↑ S3-G

1AT/3T

↑ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↑ ↓ ↓ ↓ ↓ ↓ ↑ ↑ ↓ ↑ S3-R

3T ↑ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↑ ↓ ↓ ↓ ↓ ↓ ↑ ↑ ↓ ↑ S3-R

3T/ 3AT

↑ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↑ ↓ ↓ ↓ ↓ ↑ ↓ ↓ ↓ ↓ S3-R

3AT ↑ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↑ ↓ ↓ ↓ ↓ ↓ ↑ ↓ ↑ ↓ S3-R

3AT/5T

↑ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↑ ↓ ↓ ↓ ↓ ↓ ↑ ↓ ↑ ↓ S3-R

5T ↑ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↑ ↓ ↓ ↓ ↓ ↑ ↓ ↑ ↑ ↑ S3-R

5T/5AT

↑ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↑ ↓ ↓ ↓ ↓ ↑ ↓ ↑ ↑ ↑ S3-R

5AT ↓ ↑ ↓ ↓ ↑ ↑ ↓ ↓ ↑ ↓ ↓ ↑ ↓ ↓ ↓ ↑ ↑ ↑ S3-Y

5AT/7T

↓ ↑ ↓ ↓ ↑ ↑ ↓ ↓ ↑ ↓ ↓ ↑ ↓ ↓ ↓ ↑ ↑ ↑ S3-Y

7T ↓ ↑ ↓ ↓ ↑ ↑ ↓ ↓ ↑ ↓ ↓ ↑ ↓ ↓ ↓ ↑ ↑ ↑ S3-Y7T/7AT

↓ ↑ ↓ ↓ ↑ ↑ ↓ ↓ ↑ ↓ ↓ ↑ ↓ ↓ ↓ ↑ ↑ ↑ S3-Y

7AT ↓ ↑ ↑ ↓ ↑ ↑ ↓ ↑ ↑ ↓ ↑ ↑ ↑ ↓ ↓ ↑ ↑ ↑ S3-YY

7AT/9T

↓ ↑ ↑ ↓ ↑ ↑ ↓ ↑ ↑ ↓ ↑ ↑ ↑ ↓ ↓ ↑ ↑ ↑ S3-YY



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9T ↓ ↑ ↑ ↓ ↑ ↑ ↓ ↑ ↑ ↓ ↑ ↑ ↑ ↓ ↓ ↑ ↑ ↑ S3-YY9T/9AT

↓ ↑ ↑ ↓ ↑ ↑ ↓ ↑ ↑ ↓ ↑ ↑ ↑ ↓ ↓ ↑ ↑ ↑ S3-YY

9AT ↓ ↓ ↓ ↑ ↓ ↑ ↑ ↓ ↑ ↑ ↑ ↓ ↓ ↓ ↑ ↑ ↑ ↑ S3-G

(b) Circuit with Main Signal GroupS1 S3 S5 S7 S9

1 T 1AT 3T 3AT 5T 5AT 7T 7AT 9T 9AT

Fig No.23 I. When the train is on 1 AT and signal S3 is showing

green aspect. The relay status for signal S3 shall be asunder:

Relays Status Relays Status Relays StatusS3 RE(Mn)CR S3 GPR1 S3 GPR3S3 HECR S3 GR2 S3 GR4S3 DECR S3 RE(Mn)CPR S3 HHECPRS3 GYR S3 DECPR 3 TPRS3 GLSR S3 GR3 3 ATPR

S3 GR1 S3 HECPR

S1 S3 S5 S7 S9

1 T 1AT 3T 3AT 5T 5AT 7T 7AT 9T 9ATFig No.24

II. The train passes signal S3 and occupies 3T (Train isoccupying 1AT and 3T). Signal S3 will show red aspect.The relay status for signal S3 shall be as under:

Relays Status Relays Status Relays StatusS3 RE(Mn)CR S3 GPR1 S3 GPR3S3 HECR S3 GR2 S3 GR4



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S3 DECR S3 RE(Mn)CPR S3 HHECPRS3 GYR S3 DECPR 3 TPRS3 GLSR S3 GR3 3 ATPRS3 GR1 S3 HECPR

S1 S3 S5 S7 S9


Fig No.25 III. The train has cleared 1AT and occupied 3 T only. The

relay status for signal S3 shall be as previous condition II.

S1 S3 S5 S7 S9


Fig No.26 IV. The train occupies 3T and 3AT. The relay status for signal

S3 shall be as under:

Relays Status Relays Status Relays StatusS3 RE(Mn)CR S3 GPR1 S3 GPR3S3 HECR S3 GR2 S3 GR4S3 DECR S3 RE(Mn)CPR S3 HHECPRS3 GYR S3 DECPR 3 TPRS3 GLSR S3 GR3 3 ATPRS3 GR1 S3 HECPR

S1 S3 S5 S7 S9


Fig No.27 V. The train has cleared 3T and occupied 3AT only. The

relay status for signal S3 shall be as under :



20


S1 S3 S5 S7 S9


Fig No.28 VI. The train passes signal S5 and occupies 5T (Train is

on 3AT and 5T). Signal S5 will show red aspect. Therelay status for signal S3 shall be as under :


S1 S3 S5 S7 S9


Fig No.29 VII. The train has cleared 3AT and on 5T only. The relay

status for signal S3 shall be as under :

Relays Status Relays Status Relays StatusS3 RE(Mn)CR S3 GPR1 S3 GPR3S3 HECR S3 GR2 S3 GR4S3 DECR S3 RE(Mn)CPR S3 HHECPR



21

S3 GYR S3 DECPR 3 TPRS3 GLSR S3 GR3 3 ATPRS3 GR1 S3 HECPR

S1 S3 S5 S7 S9


Fig No.30 VIII. The train occupies 5AT. (Train is on 5T and

5AT). The relay status for signal S3 shall be asprevious condition VII.

S1 S3 S5 S7 S9


Fig No.31 IX. Train has cleared 5T and occupies 5AT only. Signal

S3 will display Yellow aspect. The relay status forsignal S3 shall be as under :

Relays Status Relays Status Relays StatusS3 RE(Mn)CR S3 GPR1 S3 GPR3S3 HECR S3 GR2 S3 GR4S3 DECR S3 RE(Mn)CPR S3 HHECPRS3 GYR S3 DECPR 3 TPRS3 GLSR S3 GR3 3 ATPRS3 GR1 S3 HECPRS1 S3 S5 S7 S9


Fig No.32 X. The train passes signal S7 and occupies 7T (train is on

5AT and 7T). Signal S7 shows red aspect. The relay



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status for Signal S-3 shall be same as previouscondition IX.



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S1 S3 S5 S7 S9


Fig No.33 XI. The train has cleared 5AT and occupies 7T only. The

relay status for signal S3 shall remain same asprevious condition X.

S1 S3 S5 S7 S9


Fig No.34 XII. Train occupies 7AT (train is on 7T and 7AT).The

relay status for Signal S-3 shall remain same asprevious condition XI.

S1 S3 S5 S7 S9


Fig No.35 XIII. Train has cleared 7T and occupies 7AT only. Signal

S3 will display Double Yellow aspect. The relaystatus for signal S3 shall be as under :




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S1 S3 S5 S7 S9


Fig No.36

XIV. The train passes signal S9. Signal S9 shows redaspect. (Train is on 7AT and 9T). The relay status forSignal S3 shall remain same as previous conditionXIII.

S1 S3 S5 S7 S9


Fig No.37 XV. Train has cleared 7AT and occupies 9T only. The

relay status for signal S-3 shall remain same asprevious condition XIV.

S1 S3 S5 S7 S9


Fig No.38 XVI. Train occupies 9AT ( train is on 9T and 9AT). The

relay status for Signal S-3 shall remain same asprevious condition XV.



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1 S3 S5 S7 S9


Fig No.39 XVII. Train has cleared 9T and occupies 9AT only. Signal

S-3 will display Green aspect. The relay status forsignal S-3 shall be as under :

Relays Status Relays Status Relays StatusS3 RE(Mn)CR S3 GPR1 S3 GPR33 HECR S3 GR2 S3 GR4S3 DECR S3 RE(Mn)CPR S3 HHECPRS3 GYR S3 DECPR 3 TPRS3 GLSR S3 GR3 3 ATPRS3 GR1 S3 HECPR



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S1 S3 S5 S7 S9


Fig No.40RELAY STATUS OF DIFFERENT TRAINMOVEMENT IN AUTO. SIGNALLING

Posi

tion

of T

rain

S3 R

E(M

n)C

R

S3 H

EC

R

S3 D

EC

R

S3 G

YR

S3 G

LSR

S3G

R1

S3G

PR1

S3G

R2

S3R

E(M

n)C

PR

S3D

EC

PR

S3G

R3

S3H

EC

PR

S3G

PR3

S3G

R4

S3H

HE

CPR

3TPR

3AT

PR

Rem

arks

1AT ↓ ↓ ↑ ↓ ↓↑ ↑

↑↓ ↑ ↑ ↓ ↑

↓↓ ↑ ↑

S3-G

1AT/3T

↑ ↓ ↓ ↓ ↓↓ ↓

↓↑ ↓ ↓ ↓ ↓

↓↓ ↓ ↑

S3-R

3T ↑ ↓ ↓ ↓ ↓↓ ↓

↓↑ ↓ ↓ ↓ ↓

↓↓ ↓ ↑

S3-R

3T/ 3AT

↑ ↓ ↓ ↑ ↓↓ ↓

↓↑ ↓ ↓ ↓ ↓

↓↓ ↓ ↓

S3-R

3AT ↑ ↓ ↓ ↑ ↓↓ ↓

↓↑ ↓ ↓ ↓ ↓

↓↓ ↑ ↓

S3-R

3AT/5T

↑ ↓ ↓ ↑ ↑↓ ↓

↓↑ ↓ ↓ ↓ ↓

↓↓ ↑ ↓

S3-R

5T ↑ ↓ ↓ ↓ ↑↓ ↓

↓↑ ↓ ↓ ↓ ↓

↓↓ ↑ ↑

S3-R

5T/5AT

↑ ↓ ↓ ↓ ↑↓ ↓

↓↑ ↓ ↓ ↓ ↓

↓↓ ↑ ↑

S3-R

5AT ↓ ↑ ↓ ↓ ↓↑ ↑

↑↓ ↓ ↓ ↓ ↓

↓↓ ↑ ↑

S3-Y

↓ ↑ ↓ ↓ ↓ ↑ ↓ S3-Y



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5AT/7T

↑ ↑ ↓ ↓ ↓ ↓ ↓ ↓ ↑ ↑

7T ↓ ↑ ↓ ↓ ↓↑ ↑

↑↓ ↓ ↓ ↓ ↓

↓↓ ↑ ↑

S3-Y

7T/7AT

↓ ↑ ↓ ↓ ↓↑ ↑

↑↓ ↓ ↓ ↓ ↓

↓↓ ↑ ↑

S3-Y

7AT ↓ ↑ ↓ ↓ ↓↑ ↑

↑↓ ↓ ↓ ↑ ↓

↑↑ ↑ ↑

S3-YY

7AT/9T

↓ ↑ ↓ ↓ ↓↑ ↑

↑↓ ↓ ↓ ↑ ↓

↑↑ ↑ ↑

S3-YY

9T ↓ ↑ ↓ ↓ ↓↑ ↑

↑↓ ↓ ↓ ↑ ↓

↑↑ ↑ ↑

S3-YY

9T/9AT

↓ ↑ ↓ ↓ ↓↑ ↑

↑↓ ↓ ↓ ↑ ↓

↑↑ ↑ ↑

S3-YY

9AT ↓ ↓ ↑ ↓ ↓↑ ↑

↑↓ ↑ ↑ ↓ ↑

↓↓ ↑ ↑

S3-G

Symbols used in Siemens circuit

↑ Front contact of normally up Relay

↑ Back contact of normally up Relay

↓ Back contact of normally drop Relay

↓ Front contact of normally drop relay

Note –Typical Automatic signalling circuit using Siemensmain signal group is shown in Annexure I and atypical signalling circuit using Q series relays isshown in Annexure II.



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Cascading / cutting in arrangement-

Relay status Aspect

I. GR1 AND GR2 ↑ DECR↓ Y II. GR1↑, GR2↑, GR3↑, GR4↓ G III. GR1↑, GR2↑, GR4↑, GR3↑ YY IV. HECR↑, HHECR↑, DECR↓ R



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2.2 Q series type

S1 S3 S5 S7 S9


Fig. No.41 I. Train is on 1 AT and signal no. S 3 is showing green

aspect. The relay status for signal S3 will be as givenbelow:

Relay Status Relay Status3 HR 3 ATR3 DR 3 HECR3 HHR 3 HHECR3 DECR 3 RECR3 TR

S1 S3 S5 S7 S9


Fig. No.42 II. Train has occupied 1 AT and 3T-signal S3 will show Red

aspect and its relay status will be as given below:




30

S1 S3 S5 S7 S9


Fig. No.43 III. Train has cleared 1AT and occupying 3T. Relay status for

signal S3 will be same as above as previous condition II..

S1 S3 S5 S7 S9


Fig. No.44 IV. Now train is on 3T and 3 AT. Relay status for signal S3

will be same as above except 3ATR↓

S1 S3 S5 S7 S9


Fig. No.45 V. Train cleared 3T and occupying 3AT. The relay status for

signal S-3 will be same only 3TR will pick up 3TR↑

S1 S3 S5 S7 S9


Fig. No.46 VI. Now train is occupying 3AT and 5T, signal S5 will show

red aspect. Relay status for signal S3 will be same asabove as per previous condition V.



31

S1 S3 S5 S7 S9


Fig. No.47 VII. Train cleared 3AT and occupying 5T only. Relay status

for signal S3 will be same as above as previous conditionVI except 3 ATR .

S1 S3 S5 S7 S9


Fig. No.48 VIII. Train is occupying 5T and 5AT. Relay status for signal S3

will be same as above as previous condition VII.

S1 S3 S5 S7 S9


Fig. No.49IX. Train cleared 5T and occupying 5AT only. Signal S3 will

display yellow aspect. Relay status for signal S3 will besame as given below




32

S1 S3 S5 S7 S9


Fig. No.50

X. Train is occupying 5AT and 7T. Signal S7 will showdanger/red aspect. Relay status for signal S3 will besame as above.

S1 S3 S5 S7 S9


Fig. No.51

XI. Train cleared 5AT and occupying 7 T. Relay status forsignal S3 will be same as previous condition X.

S1 S3 S5 S7 S9


Fig. No.52

XII. Train is occupying 7T and 7AT. Relay status for signal S3 will be same as previous condition XI.



33

S1 S3 S5 S7 S9


Fig. No.53

XIII. Train cleared 7T and occupying 7 AT. Relay status forSignal S3 will be changed. Signal S-3 will display doubleyellow and S-5 will display yellow.

3HHR ↑ 3HHECR ↑

S1 S3 S5 S7 S9


Fig. No.54XIV. Train is occupying 7AT and 9T. Signal S9 will display

Red aspect and relay status for S3 will be previouscondition XIII.

S1 S3 S5 S7 S9


Fig. No.55

XV. Train cleared 7AT and occupying 9T only. Relaystatus for S3 will be previous condition XIV.



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S1 S3 S5 S7 S9


Fig. No.56XVI. Train is occupying 9T and 9AT. Relay status forSignal S3 will be previous condition XV.1 S3 S5 S7 S9


Fig. No.57XVII Train cleared 9T and occupying 9AT only. Signal S3will display Green, Signal S5 will display double yellow,Signal S7 will display yellow and Signal S9 will display Redaspect.

RelayStatus Relay Status

3 HR ↑ 3 ATR ↑3 DR ↑ 3 HECR ↓3 HHR ↓ 3 HHECR ↓3 DECR ↑ 3 RECR ↓3 TR ↑



35

S1 S3 S5 S7 S9


Fig. No.58

RELAY STATUS OF DIFFERENT TRAINMOVEMENT

Positionof train S3

HR

S3DR

S3HHR

S3DECR

3TR

3ATR

S3

RECR

S3

HECR

S3

HHECR

REMARK

ON 1 AT ↑ ↑ ↓ ↑ ↑ ↑ ↓ ↓ ↓ S 3 –GON 1AT& 3T

↓ ↓ ↓ ↓ ↓ ↑ ↑ ↓ ↓ S 3- R AS 3 DECRDROPS

ON 3T ↓ ↓ ↓ ↓ ↓ ↑ ↑ ↓ ↓ S3 –RON 3T &3AT

↓ ↓ ↓ ↓ ↓ ↓ ↑ ↓ ↓ --DO--

ON 3 AT ↓ ↓ ↓ ↓ ↑ ↓ ↑ ↓ ↓ ---DO--ON 3AT& 5T

↓ ↓ ↓ ↓ ↑ ↓ ↑ ↓ ↓ ---DO--

ON 5T ↓ ↓ ↓ ↓ ↑ ↑ ↑ ↓ ↓ -----DO-----ON 5T &5AT

↓ ↓ ↓ ↓ ↑ ↑ ↑ ↓ ↓ ---- DO-----

ON 5AT ↑ ↓ ↓ ↓ ↑ ↑ ↓ ↑ ↓ S 3-Y

5AT &7T ↑ ↓ ↓ ↓ ↑ ↑ ↓ ↑ ↓ -----DO----ON 7T ↑ ↓ ↓ ↓ ↑ ↑ ↓ ↑ ↓ S 3 –YON 7T &7AT

↑ ↓ ↓ ↓ ↑ ↑ ↓ ↑ ↓ ---DO--

7 AT ↑ ↓ ↑ ↓ ↑ ↑ ↓ ↑ ↑ S 3-YY, ON 7AT& 9T

↑ ↓ ↑ ↓ ↑ ↑ ↓ ↑ ↑ ---DO--

ON 9T ↑ ↓ ↑ ↓ ↑ ↑ ↓ ↑ ↑ S 3 -YY,ON 9T &9AT

↑ ↓ ↑ ↓ ↑ ↑ ↓ ↑ ↑ ----DO----

ON 9AT ↑ ↑ ↓ ↑ ↑ ↑ ↓ ↓ ↓ S 3-G



36

CHAPTER 3

MAINTENANCE OF AUTOMATICSIGNALLING

3.1 To carry out day to day maintenance in Automatic

Signalling section, following maintenance handbookprepared by CAMTECH/Gwalior may be referred.

Name of handbook Publication No.

Colour light signal CAMTECH/S/CLS/1.0

Siemens point machine CAMTECH/S/SPM/1.0

IRS point machine CAMTECH/S/IRSPM/1.0

DC track circuit CAMTECH/S/DCTC/1.0

Power Equipment CAMTECH/S/PQ/1.0

Lead acid battery CAMTECH/S/1-96

Electric lifting barrier CAMTECH/S/ELB/1.0


MaintenancAutomatic s

37

3.2 DO’S and DON’TS

3.2.1 DO’s

As far as possible bulb must be replaced duringmorning period since mostly bulb fuse during first5 hours.

Check due date of overhauling of track relay. ifdue, it should be replaced timely.

Apply glue epoxy on the rail and fish plate ofjoints to avoid shorting due to iron fillings and ironpowder.

Check time delay circuit is working properly.

Always work carefully as train traffic is on highersi in automatic signalling territory.
de
e handbook on March.2001ignalling



38

3.2.2 DON’TS

Forget to take the no load current of signaltransformer.

Forget to close and lock the back cover aftercompletion of work.

Discharged Battery excessively.

Add impure distilled water and acid in the batteries.

Bypass the regulating resistance of track circuit at anytime.

Disturb the antilittering arrangement of track relay.

Forget to give disconnection memo to on dutyASM/CASM at for time of attending failure.

Adjust the track circuit beyond the limit of trackcircuit parameters.

Commence maintenance work of point withouttelecommunication with ASM/CASM.

Try to replace any part of the point machine orassociated wiring without proper disconnectionnotice.



1

Annexure IIQ-series Aspect control circuit of a Automatic Stop Signal

3HR 3HHR

3HR 3HHR

3 HHECR

3 DECR

3 HECR

3 RECR

3 DECR

3 DR

3 DR

3 DR

3 DR

3 DECR

3 DR

3 DECR

3 DECR 3 HECR 3 HHECR

3 HR

3 HR

3 HHECR 3 HECR 3 DECR

HHG

DG

HG

RG



2

333

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