Railway Engineering
The slipping of driving wheels of locomotives on the rail surface causes

corrugation of rails
wheel burns
scabbing of rails
hogging of rails

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Railway Engineering
Stretcher bar is provided

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

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