Railway Engineering
The treadle bar is provided

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

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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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