Railway Engineering
Consider the following surveys. 1. Reconnaissance survey 2. Preliminary survey 3. Traffic survey 4. Location survey The correct sequence in which these surveys are conducted before the alignment of a track is finalised is

1,3,4,2
1,3,2,4
3,1,2,4
3,1,4,2

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Railway Engineering
A triangle is used for

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

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