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

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

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Railway Engineering
Switch angle is the angle between

the gauge face of the stock rail and outer face of the tongue rail
the outer face of the stock rail and tongue rail
the gauge face of the stock rail and tongue rail
the outer face of the stock rail and the gauge face of the tongue rail

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