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
The treadle bar is provided

near and parallel to inner side of one of the rails
near and parallel to inner side of both the rails
in the middle of the track a little in front of the toes of the tongue rail
at right angle to the rail

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