Railway Engineering
Heel divergence is

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

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Railway Engineering
A triangle is used for

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

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