Railway Engineering
A triangle is used for

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

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Railway Engineering
Switch angle is the angle between

the gauge face of the stock rail and outer face of the tongue rail
the outer face of the stock rail and the gauge face of the tongue rail
the outer face of the stock rail and tongue rail
the gauge face of the stock rail and tongue rail

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