Railway Engineering
Flange-way clearance is the distance

Between the gauge faces of the stock rail and the tongue rail
Through which the tongue rail moves laterally at the toe of the switch
None of these
Between the adjoining faces of the running rail and the check rail near the crossing

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Railway Engineering
Lead of crossing is the distance from the

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

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