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Sat Dec 10, 2016 12:31:15 ISTHomeTrainsΣChainsAtlasPNRForumGalleryNewsFAQTripsLoginFeedback
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What is the Signalling system used in Indian Railways?  
2 Answers
Aug 05 2011 (2:38PM)
General

Entry# 495     
Charm Vanished*^~
What is the Signalling system used in Indian Railways?

★  Rail Fanning
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Feb 08 2013 (2:26PM)
Blog Post# 664101-0     
Heiroglyphics   Added by: WAP4 Red Beast  Feb 08 2013 (3:48PM)
Very informative :)

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Aug 05 2011 (2:36PM)
Blog Post# 215481-0     
ThE BoSs*^~   Added by: Charm Vanished*^~  Aug 05 2011 (2:38PM)
Q. What is Signalling systems of Railways???
Ans. The Indian Railways makes use of colour signal lights, but in some remote areas of operation, the older semaphores and discs-based signalling (depending on the position or colour) are still in use. Except for some high-traffic sections around large cities and junctions, the network does not use automatic block systems. However, the signals at stations are almost invariably interlocked with the setting of points (routes) and so safety does not depend on the skill of the station masters. With the planned introduction of Cab signalling/Anti collision devices the element of risk on account of drivers overshooting signals will also be eliminated.
Coloured
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more...
signalling makes use of multi-coloured lighting and in many places is automatically controlled. There are three modes.
Two aspect signalling, which uses a red (bottom) and green (top) lamp
Three aspect signalling, which uses an additional amber lamp in the centre
Four (multiple) aspect signalling makes use of four lamps, the fourth is amber and is placed above the other three.
Multiple aspect signals, by providing several intermediate speed stages between 'clear' and 'on', allow high-speed trains sufficient time to brake safely if required. This becomes very important as train speeds rise. Without multiple-aspect signals, the stop signals have to be placed very far apart to allow sufficient braking distance and this reduces track utilisation. At the same time, slower trains can also be run closer together on track with multiple aspect signals.
Semaphores make use of a mechanical arm to indicate the line condition. Several subtypes are used:
*Two aspect lower quadrant
*Three aspect modified lower quadrant
*Multiple aspect upper quadrant
*Disc-based: These signals are located close to levers used to operate points. They are all two-aspect signals.
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