Railway Engineering
The object of providing a point lock is

to ensure that each switch is correctly set
None of these
to ensure that the point may not be operated while the train is on it
to detect any obstruction between and tongue rail

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

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