Railway Engineering
The purpose of providing fillet in a rail section is to

Avoid the stress concentration
Increase the lateral strength
Increase the vertical stiffness
Reduce the wear

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Railway Engineering
Flange-way clearance is the distance

Between the gauge faces of the stock rail and the tongue rail
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

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