Railway Engineering
Which one of the following rail failures is caused by loose fish bolts at expansion joints?

transverse fissures
crushed head
split head
angular break

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

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