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

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

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Railway Engineering
Stretcher bar is provided

To prevent any vertical movement between the wing rail and nose of crossing
To ensure exact gauge at the toe of the switch as well as the nose of crossing
To maintain the two tongue rails at the exact distance
To permit lateral movement of the tongue rail

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