Railway Engineering
Stretcher bar is provided

To prevent any vertical movement between the wing rail and nose of crossing
To permit lateral movement of the tongue rail
To ensure exact gauge at the toe of the switch as well as the nose of crossing
To maintain the two tongue rails at the exact distance

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

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