Railway Engineering
A triangle is used for

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

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Railway Engineering
Lead of crossing is the distance from the

toe of the switch to the theoretical nose of crossing
heel of the switch to the theoretical nose of the crossing
heel of the switch to the toe of the switch
toe of the switch to the actual nose of crossing

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