Railway Engineering
In a scissors cross-over, the crossings provided are
i) 2 obtuse angle crossings
ii) 4 obtuse angle crossings
iii) 4 acute angle crossings
iv) 6 acute angle crossings
The correct answer is

(i)and(iv)
(ii) and (iii)
(i) and (iii)
(ii) and (iv)

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Railway Engineering
Stretcher bar is provided

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
To permit lateral movement of the tongue rail

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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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