Railway Engineering
The formation width for a railway track depends on the i) type of gauge ii) number of tracks to be laid side by side iii) slope of sides of embankment or cutting The correct answer is

(i), (ii) and (iii)
both (i) and (iii)
only (i)
both (i) and (ii)

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Railway Engineering
A triangle is used for

Separating all the sidings and shunting lines from main lines
Changing the direction of engine
Transferring wagons to and from parallel tracks without shunting
Preventing the vehicles from running off the track

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