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

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

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Railway Engineering
The treadle bar is provided

near and parallel to inner side of both the rails
near and parallel to inner side of one of the rails
at right angle to the rail
in the middle of the track a little in front of the toes of the tongue rail

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