Railway Engineering
Due to battering action of wheels over the end of the rails, the rails get bent down and are deflected at ends. These rails are called

Buckled rails
Roaring rails
Hogged rails
Corrugated rails

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Railway Engineering
Heel divergence is

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

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