Railway Engineering
The treadle bar is provided

at right angle to the rail
in the middle of the track a little in front of the toes of the tongue rail
near and parallel to inner side of both the rails
near and parallel to inner side of one of the rails

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Railway Engineering
Heel divergence is

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

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