No official Railway Board PDF has been traced for this entry yet. The text below was read from the document held in the library.
| Type | Commercial Circular |
|---|---|
| Topic | freight |
Stop Signal, the Outer most starter signal shall be the Last Stop Signal of the station
S 1
BASICS OF SIGNAL ENGINEERING
Issued in November 2009
INDIAN RAILWAYS INSTITUTE OF
SIGNAL ENGINEERING & TELECOMMUNICATIONS
SECUNDERABAD - 500 017
S-1
BASICS OF SIGNAL ENGINEERING
CONTENTS
S.No
Chapter
Page No
1
Role of Signalling in Railway operation
1
2
Definitions (GR 1.02)
2
3
Signalling Concepts
7
4
Fixed Signals, Kinds, Aspects & Indications (GR.3.02-3.08)
9
5
Designation of Signals
21
6
Location of Signals
24
7
Subsidiary Signals, Repeaters, Indicators, Markers & Back Lights
31
8
Overlaps
49
9
Breaking Distance
53
10
Sighting Distance & Visibility of Signals
55
11
Isolation
58
12
Simultaneous Reception and Despatch of Trains
62
13
Systems of working
65
14
Classification of Stations – Comparison of A, B & C
76
15
Standards of Interlocking
82
16
Operation of Points
89
17
Inter Cabin control
91
18
Level Crossing Gates
93
19
Section capacity
107
20
Principles of Signal Engineering
109
21
Annexure 1: Intermediate Sidings
111
© IRISET
http://www.iriset.ac.in
Drafted By
M.D.Dixit, IES-7
Checked By
S.V.Rao, PS
Approved By
Ch.Mohan, SPS
DTP and Drawings
G.Rajagopal, SE (D)
No. of Pages
115
Date of Issue
November, 2009
Version No
A2
“ This is the Intellectual property for exclusive use of Indian Railways. No part of this publication
may be stored in a retrieval system, transmitted or reproduced in any way, including but not limited
to photo copy, photograph, magnetic, optical or other record without the prior agreement and
written permission of IRISET, Secunderabad, India”
INTRODUCTION
Page 1
BASICS OF SIGNAL ENGINEERING
CHAPTER 1: ROLE OF SIGNALLING IN RAILWAY OPERATION
1.1
Railway Signalling and Communication Technology, though evolved primarily for safe
working of trains, plays an important part in increasing line capacity with minimum investment.
With the advent of computers and extended communication network on the Railways, the scope
of Signalling Technology has widened to incorporate even automatic operation. The broad
areas of Railway Signalling and Communication Technology are:
1.2
Block Working
Trains are to be adequately spaced apart to prevent collision between trains running in
the same direction and prevent trains entering on the same track from the opposite direction.
This is achieved by block working between stations.
1.3
Interlocking
When trains are to be crossed or overtaken at stations, points and signals are to be
worked in proper sequence to make passage of trains safe and interlocking between points and
signals takes care of this. Interlocking also safeguards simultaneous movements in stations.
Semaphore signals are worked by single wire, double wire or electric motors. Colour light
signals are provided for improved visibility, easier working and maintenance. Points are worked
by rod, double wire, pneumatic/hydraulic or electric power. Interlocking between point levers
and signal levers can be effected either mechanically by means of tappets or locking electrically
by means of electric lever locks or relays. With Route Relay Interlocking, a complete route can
be set by one operation and suitably safeguarded against conflicting moves.
1.4
Train detection
Track circuits can detect the presence of a train on a portion of track or axle counters
and this information is used for controlling the signal, which in turn controls the train
movements.
1.6
Automatic Warning System
As an aid to the driver to know the condition of the signal and to prevent accidents when
the driver ignores the aspect of a stop signal, Automatic Warning System is employed. If the
driver, due to any reason, does not act upon a signal, the train is brought to stop by automatic
brake application.
In addition to warning and stopping, as explained above, the speed of the train is
continuously monitored and checked w
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