The ring-shaped Mukundpur-Shiv Vihar line will encircle Delhi much like the Ring Road, in several areas actually running alongside it.
The line will also make commuting easier for Delhi University students, connecting North Campus with its sibling in the South.
The engineering challenges are too many.
At Dhaula Kuan, the new line will pass over the existing Airport Express Metro line.
'Constructing a line over another line is one of the most difficult tasks as far as rail projects go,' an engineer working on the project said.
'It has to be ensured that daily operations on the existing line are not disrupted. More importantly, no harm must come to passengers travelling on the existing line,' he added.
Metro's ring rail will pass over the airport express line at Dhaula Kuan at 23m, making it the highest point the Metro will climb in the Capital.
'This will be a critical piece of workmanship and, everyday, we will only get four hours at night to carry out construction when trains on the airport line do not ply.
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