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Tunnelling - Engineering

Q1:

The difference of heights of the tunnels above rail tops of BG and MG tracks is kept

A 0.30 m

B 0.45 m

C 0.60 m

D 0.75 m

ANS:C - 0.60 m

BG = Broad gauge (gauge length-1.676m).
MG = Meter gauge (gauge length -1.0m).

In India, BG is commonly used. and mg is rarely used.