The document discusses railway signaling and control systems, emphasizing the importance of safe and efficient train operation. It classifies signals based on operating, functional, locational, and special characteristics, detailing various types such as semaphore and visual signals. Additionally, it explores control systems, including time interval and space interval methods for managing train movements.

1. Dr. Walied A. Elsaigh
welsaigh@ksu.edu.sa
Asst. Prof. of Civil Engineering
Rajab - 1435H
CE 435
Railway Engineering
Signalling
& Control
Systems
Adapted from : http://www.roscalen.com/signals/

2. Textbook
Pages 20.1-20.25

3. Introduction
Signalling consists of the systems, devices and
means by which trains are operated efficiently and rail
tracks are used to maximum extend, maintaining the
safety of passengers, the staff and rolling stock

4. Classification & Types of Signals
Signals can be
classified to:
Operating Characteristics
(How signal is operated?)
Functional Characteristics
(What is signal function?)
Locational Characteristics
(Where signal is located?)
Special Characteristics
(Not popular)

5. Classification &
Types of Signals
Operating Characteristics
(How signal is operated?)
Detonating signals
(Fog or audible)
Visual indication signals
Hand signals Fixed signals

6. Classification &
Types of Signals
Functional Characteristics
(What is signal function?)
Semaphore
signals
Warner
signals
Coloured- light
signals
Shunting signals
Post-mounted disc
Ground
http://www.railsigns.co.uk/overseas/india1/india1.html

7. Classification &
Types of Signals
Locational Characteristics
(Where signal is located?)
Reception signals
Outer
signal
Home
signal
Departure signals
Starter
signal
Advance starter
signal

8. Classification &
Types of Signals
Special Characteristics
(Not popular)
Repeater
(co-acting)
signal
Routing
signal
Calling on
signal
Point
indicator
signal
Miscellaneous

9. Semaphore Signalling
Rectangular –like arm fixed to a vertical post. The arm is
allowed to rotate in various angles. Each position
conveys certain information to the loco driver
Adapted from:
http://en.wikipedia.org/wiki/File:Signal_Home_%26_Distant_Semaphore_RYG.svg

10. Control Systems
Time Interval Method
Time Interval
Space Interval
How Train Movement is Controlled?

11. Control Systems
Space
Interval
Method
Length of the track is divided into
sections (BLOCKS). The entry of a train
into the block is allowed only when the
block is free. {Leave a space between
two consecutive trains}
Visual
signals
Audible
signals