Railway Engineering
Consider the following statements : Automatic signaling system results in
1. greater risk
2. higher efficiency
3. avoidance of block instruments
4. higher operating cost of these statements

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

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Railway Engineering
Lead of crossing is the distance from the

heel of the switch to the theoretical nose of the crossing
toe of the switch to the actual nose of crossing
toe of the switch to the theoretical nose of crossing
heel of the switch to the toe of the switch

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Railway Engineering
Stretcher bar is provided

To permit lateral movement of the tongue rail
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

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