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 ?

iock bar
stretcher bar
detectors
point lock

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Railway Engineering
A triangle is used for

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

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