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
Transferring wagons to and from parallel tracks without shunting
Changing the direction of engine

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

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