Railway Engineering
The treadle bar is provided

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

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Railway Engineering
Flange-way clearance is the distance

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

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