Railway Engineering
Creep is the

Longitudinal movement of rail
Lateral movement of rail
Difference in level of two rails
Vertical movement of rail

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Railway Engineering
Stretcher bar is provided

To permit lateral movement of the tongue rail
To prevent any vertical movement between the wing rail and nose of crossing
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

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