Railway Engineering
A treadle bar is used for

interlocking points and signal
track maintenance
setting marshalling yard signals
setting points and crossings

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Railway Engineering
Flange-way clearance is the distance

Between the adjoining faces of the running rail and the check rail near the crossing
None of these
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

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