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Summary

systems and equipments (a) DISTANT SIGNAL: On single line or double line, the distant signal shall be placed at

Text of the circular

इǐर
BASICS OF
 
 
 
 
 
 
 
 
 
 
 
ǐरसेट   
 
 
 
S1 
F INDIAN RAILWAY S
 
IRISET 
SIGNALLING

S1 
BASICS OF INDIAN RAILWAY SIGNALLING 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
INDIAN RAILWAYS INSTITUTE OF  
SIGNAL ENGINEERING & TELECOMMUNICATIONS 
SECUNDERABAD - 500 017  
 
Issued in July 2022

MISSION  : To deliver knowledge to make the workforce 
competent and confident in their field of Working 
VISION      :   To make IRISET a technical institute of global repute 
VALUES   :  Discipline, Devotion to duty, Integrity, Competence, 
Team Working and Safe Working 
 
The Material Presented in this IRISET Notes is for guidance only. It does not over 
rule or alter any of the Provisions contained in Manuals or Railway Board’s 
directives

Revision History 
 
 
Notes No. 
Version 
Revision details 
Issued on 
S1 
A1 
----- 
------- 
 
A2 
 
November 2009 
 
A3 
 
July 2022 
 
 
 
 
 
Drafted By 
G.V. Rao, ITD2 
Checked By 
K. Uma Maheswara Rao, APS 
A. Kalyan Kumar, PS1 
Approved By 
Y. Ramesh Babu, SPS 
DTP & Drawings by
P.V. Surya Narayana, JE (D) 
No. of Pages 
117 
Date of Issue 
July 2022 
Version No 
A3 
 
 
 
 
 
 
In case of any suggestions please write to APS/PS1 or mail to APS/PS1 at email address 
aps@iriset.indianrail.gov.in/ ps1@iriset.indianrail.gov.in 
 
 
 
 
 
 
 
© IRISET 
 
 
 
 
http://www.iriset.indianrailways.gov.in 
 
 
“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”

CONTENTS 
 
CHAPTER 1: INTRODUCTION TO RAILWAY SIGNALLING .................................................... 1 
1.1 
INTRODUCTION ............................................................................................................ 1 
1.1.1 Need for Signalling in Railways: ...................................................................................... 1 
1.1.2 Railway signaling versus Road signaling: ........................................................................ 1 
1.1.3 Railway Signalling conveys the following: ....................................................................... 1 
1.1.4 Evolution of Rail Transport .............................................................................................. 2 
1.1.5 Evolution of Signalling ..................................................................................................... 3 
1.1.6 Signalling in Indian Railways ........................................................................................... 4 
1.1.7 CONTROL OVER MOVEMENT OF TRAINS .................................................................. 4 
1.1.8 TIME INTERVAL METHOD............................................................................................. 5 
1.1.9 SPACE INTERVAL METHOD ......................................................................................... 5 
1.2 
SIGNALS ........................................................................................................................ 6 
1.2.1 BLOCK WORKING ......................................................................................................... 6 
CHAPTER 2: INTRODUCTION TO RULES, MANUALS AND SPECIFICATIONS .................... 7 
2.0 INTRODUCTION: ................................................................................................................. 7 
2.1 General and Subsidiary Rules (G&SR) ................................................................................. 7 
2.1. 3 Signal Engineering Manual (IRSEM) ............................................................................... 7 
2.1.4 Telecom Manual: ............................................................................................................ 7 
2.1.5 A.C Traction Manual: .................

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