Railway Engineering
The object of providing a point lock is

to ensure that the point may not be operated while the train is on it
to ensure that each switch is correctly set
None of these
to detect any obstruction between and tongue rail

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Railway Engineering
Stretcher bar is provided

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

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