Insta
Five tunnels are being constructed for the broad gauge third line project.
The national transporter has focussed on the execution of maintenance works pending for several years, confronting the Railways with severe bottlenecks.
The Railways maintained that this will ease congestion on Golden Diagonal, Delhi-Chennai route.
RVNL is constructing these tunnels in the horse shoe section; this form consists of a semi-circular roof together with arched sides and a curved invert.