Civil Engineering - UPSC Civil Service Exam Questions - Discussion

38. 

A Treadle bar is used for

[A]. Interlocking points and signal
[B]. Setting points and crossings
[C]. Setting marshalling yard signals
[D]. track maintenance

Answer: Option A

Explanation:

No answer description available for this question.

Abhishek Anand said: (May 6, 2016)  
A treadle bar is generally installed at the point of switching the track system. A treadle bar is an electronic circuit that is activated only when the train is passing over it.

As soon as the train starts passing over it, the treadle bar disables the function of switching the track, because switching a track when the half of the train has already crossed it will lead to an accident.

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