Railway Engineering
A triangle is used for

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

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Railway Engineering
Flange-way clearance is the distance

Through which the tongue rail moves laterally at the toe of the switch
Between the adjoining faces of the running rail and the check rail near the crossing
None of these
Between the gauge faces of the stock rail and the tongue rail

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