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
Heel divergence is

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

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Railway Engineering
Stretcher bar is provided

To permit lateral movement of the tongue rail
To ensure exact gauge at the toe of the switch as well as the nose of crossing
To prevent any vertical movement between the wing rail and nose of crossing
To maintain the two tongue rails at the exact distance

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