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

angular break
transverse fissures
crushed head
split head

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Railway Engineering
The treadle bar is provided

near and parallel to inner side of one of the rails
in the middle of the track a little in front of the toes of the tongue rail
near and parallel to inner side of both the rails
at right angle to the rail

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