Railway Engineering
Two important constituents in the composition of steel used for rail are

Carbon and manganese
Manganese and phosphorous
Carbon and sulphur
Carbon and silicon

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Railway Engineering
The treadle bar is provided

near and parallel to inner side of both 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
near and parallel to inner side of one of the rails

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