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

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

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Railway Engineering
Lead of crossing is the distance from the

heel of the switch to the toe of the switch
heel of the switch to the theoretical nose of the crossing
toe of the switch to the theoretical nose of crossing
toe of the switch to the actual nose of crossing

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