The document discusses various aspects of signalling systems used in Indian metro rail networks such as Kolkata Metro, Delhi Metro, and Bangalore Metro. It describes signalling equipment like point machines, track circuits, and different types of signals including cab signals, fixed signals, and flag signals. The document also provides information on interlocking, train control systems, and operation control centres used for train movement and safety.

1. Advance Signalling System
By Rom!el Rajbansh

2. Kolkata Metro : The Kolkata Metro is a mass rapid transit system
serving the city of Kolkata. It was the first such form of transportation
in India, opening commercial services in 1984.
Delhi Metro : Planning for the metro started in 1984, when the
DDA and the Urban Arts Commission came up with a proposal for
developing a multi-modal transport system for the city. The
Government of India and Delhi jointly set up the Delhi Metro Rail
Corporation (DMRC) in 1995. Construction started in 1998, and the
first section, opened in 2002.
Rolling stock 179 trains, total length of track 189.63 kilometres with
142 stations of which 35 are underground.
Bangalor Metro : Opened in 2010. And Construction started for
Mumbai , Hyderabad & Chinnai Metro.
Metro Rail in India

3. Signalling
• For ensuring Safe train movement
• Signalling is used for increasing line capacity
• Signaling is mean of communication to
Impart Non Verbal information to Train
Operator.

4. Signalling Equipment
Signalling
Equipment
Point
Machine
Track Circuit Signal
CATC

5. POINT MACHINE
Point means a connection used to
connect one line to another for the
purpose of making a movement for one
line to other line

6. • POINT MACHINE IN DEPOT

7. • POINT MACHINE IN MAINLINE

8. Point Machine: - is a signaling gear which is used for
diverting train/ vehicle from one line to another.
: Point Position: - Point has two positions
1. NORMAL
2. REVERSE
ELECTRIC KEY TRANSMITTER

9. Point Position
(Normal)
• (a) NORMAL: - means that Position of a point
which is normally set for most of the trains.

10. (b) REVERSE: - means that Position of a point which is
not normally set for most of the trains but when
operated by point machine can cause train/ vehicle
to change to another line.
Point Position
(Reverse)

11. Track Circuit
• Track circuit is a device which is used for detecting
the presence or absence of train.
• Apart from detection of train presence, it is used
for SACEM (Systeme d’Aide à la Conduite à l’Exploitation et à la
Maintenance ) data transmission.
TC1 TC2 TC3
Target point sent to the train to train, OCC, DCC, SCR, SER, etc.

12. Track Circuit
SMARTWAY DIGITAL TRACK CIRCUITS (SDTC)
SDTC cubicle, and TWC rack
RELAYS/Relay panel
All signal elements like main line signals, depot signals, point
machines, shunt signals other then Track Circuits need to be
proved by relays. The inputs from the field first come to the relay
panel.
Power supply panel7.

13. Transmission
Track to Train
Transmission
Train to Track Transmission
(Through DLR)
Spot Transmission
(Through beacons.
E.g. RB, STIB and
MTIB)
Track side ATC Equipment
Track side ATC equipment communicates with the train born ATC for the
safe running of the train. ATC cubicle is called 2 out of 3 cubicle (2oo3). It
is SIL(Target point sent ) to the train B 4 system. The communication is two
way. The Transmission between Track side and Train can be classified as

14. STIB (DL/DLR-
Down Link Receptor)
Stationary Train Initialization Beacon

15. STIB

16. Antenna
RB / MTIB
Re-localization /
Moving Train Initia
lization Beacon

17. Impedance Bonds
A connection box, usually mounted between the rails,
which provides continuity with return signal/current.

18. Signal
• Cab Signal
• Fixed Signal
• Flag Signal

19. Cab Signal
• Cab signal is indication provided inside Train
Operator’s cab in terms of speed code.
• Proceed: Speed Code other than zero
• Stop: Speed code is zero
CAB SIGNAL
1ST MMI : Man Machine Interface
Odometer speed sensor
0
20
40 60
80
km/h
100
90
70
50
30
10

20. CAB SIGNAL
2nd DMI : Direct Media Interface

21. 1.A : Route Signal (With Route Indicator Line-1)
Route indicator
1841
Colour light signals in UK in the 1920s

22. 1.B : Route Signal
Green : Proceed :
Route set , locked and the track circuits to the next
route signal are clears. (or the two blocks are
clear).
Violet : Conditional proceed :
Route set and locked ,and the first track circuit after the
signal is clear. (or two track circuits of the cross over).
or the green aspect is failed or Route Indicator (or repeater
Route indicator is not lit if control given for it).
Red : Stop :
Route not set and locked ,or the first track circuit after the
signal is occupied (or one of the two track circuits for a cross
over).
60 km/h : 201 km/h

23. 2 : Shunt Signal
• The Shunt signal has three lamps to display
different indications.
• There are two types of indications.
• Two lunar white horizontal lamps : Stop
(Normal, ON, restrictive aspect) Route not
set and locked, or if the route includes track
circuits one of them is occupied.
• Two lunar white lamps at 45°in the left-
hand upper quadrant : proceed (or Clear,
OFF, permissive aspect), Route set and
locked ,and if the route includes track
circuits all of them are clear.

24. 3 : Repeater Signal
• These signals have
only two aspect.
–Violet
–Green

25. 4 : Buffer Stop Signal
Used at
• the ends of the line ;
• the ends of the siding in the line
and in the depot ;
• the ends of the test track in the
depot ;
• These signal permanently show
red aspect

26. INTERLOCKING
Interlocking means arrangement of signals, points
and other appliances operated from lever frame or
panel electrically, mechanically or both in such a
way that there operation must perform in proper
sequence to ensure safety.
In CBI (Computer Based Interlocking)
Monitor and Control Signaling Equipment Track Circuits,
Points, Signals, Cycles and Routes
1980s

27. System of working
• CATC (Continuous Automatic Train Control)
• CATC’s Subsystem :
– ATS (Automatic Train Supervision)
– ATC (Automatic Train Control)
– ATP (Automatic Train Protection )
– ATO (Automatic Train Operation )
Related Speed . Continuous monitoring of braking. Audio visual
warning and application of brakes, if necessary. Maintaining safety
distance between trains. Monitoring of stopping point. Releasing doors
on the correct side of the platform when train comes to a stop.

28. Operation Control Centre

29. Signal Set SAFE Way

30. Rail Transport in India - 1849, in
1951 Nationalized , in 1853
introduced . 135,000 km Track,
60,000 Rolling stock, 20 million
passengers per day.
Meter gauge 1,000 mm.
Narrow gauge 1,067 mm.
Broad-gauge 1435 mm.
Track gauge 1676 mm.