Railway Engineering
Due to battering action of wheels over the end of the rails, the rails get bent down and are deflected at ends. These rails are called

Corrugated rails
Hogged rails
Roaring rails
Buckled rails

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Railway Engineering
A triangle is used for

Changing the direction of engine
Preventing the vehicles from running off the track
Transferring wagons to and from parallel tracks without shunting
Separating all the sidings and shunting lines from main lines

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