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
detectors
point lock

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Railway Engineering
The treadle bar is provided

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
near and parallel to inner side of one of the rails

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