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 ?
(A) detectors
(B) point lock
(C) iock bar
(D) stretcher bar
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 ?
(A) detectors
(B) point lock
(C) iock bar
(D) stretcher bar
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