Railway Engineering
Stretcher bar is provided

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
To maintain the two tongue rails at the exact distance
To permit lateral movement of the tongue rail

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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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