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

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

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Railway Engineering
The treadle bar is provided

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

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