Railway Engineering
Consider the following statements about concrete sleepers. 1. They improve the track modulus. 2. They have good scrap value. 3. They render transportation easy. 4. They maintain the gauge quite satisfactorily. Of these statements

1 and 2 are correct
1 and 4 are correct
3 and 4 are correct
2 and 3 are correct

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Railway Engineering
Stretcher bar is provided

To permit lateral movement of the tongue rail
To maintain the two tongue rails at the exact distance
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

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