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

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Railway Engineering
The treadle bar is provided

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
near and parallel to inner side of one of the rails
at right angle to the rail

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Railway Engineering
A triangle is used for

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

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