Railway Engineering
Which of the following mechanical devices is used to ensure that route cannot be changed while the train is on the point even after putting back the signal ?

stretcher bar
iock bar
point lock
detectors

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Railway Engineering
A triangle is used for

Separating all the sidings and shunting lines from main lines
Transferring wagons to and from parallel tracks without shunting
Preventing the vehicles from running off the track
Changing the direction of engine

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