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 ?

detectors
stretcher bar
iock bar
point lock

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Railway Engineering
Stretcher bar is provided

To prevent any vertical movement between the wing rail and nose of crossing
To ensure exact gauge at the toe of the switch as well as the nose of crossing
To maintain the two tongue rails at the exact distance
To permit lateral movement of the tongue rail

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