Railway Engineering
A triangle is used for

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

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Railway Engineering
Heel divergence is

Equal to flange-way clearance
Always less than flange-way clearance
Always greater than flange-way clearance
Sometimes greater than flange-way clearance

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