Railway Engineering
Heel divergence is

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

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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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