Railway Engineering
Lead of crossing is the distance from the

toe of the switch to the theoretical nose of crossing
toe of the switch to the actual nose of crossing
heel of the switch to the theoretical nose of the crossing
heel of the switch to the toe of the switch

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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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