Railway Engineering
A triangle is used for

Changing the direction of engine
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

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Railway Engineering
Flange-way clearance is the distance

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

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