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

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

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