KOLKATA METRO UG PROJECT (EAST WEST CORRIDOR)​

Kolkata Metro Line 2 (Green Line) is a rapid transit line of the Kolkata Metro in the Indian state of West Bengal. Line 2 contains India’s first underwater metro tunnel together with the deepest metro shaft.​

The project consist of 17 stations from Teghoria (Haldiram) in the east to Howrah Maidan in the west, comprising of 11 elevated and 6 underground stations, with a total distance of 22 km.

Key features of the project

The Detailed Design Work was awarded to SYSTRA in January 2016 by Transtonnelstroy Afcons JV which included:

• Design and Engineering works for Underground Stations at Howrah Maidan with Cross Over, Howrah with Subway
  
  
• New Mahakaran with provision of Retrieval/Launching Shaft, Vent Shaft, and associated Tunnels with Cross Passages

Tunneling operation carried out below one of the busiest flyovers in India. Exhaustive studies, analysis and precautionary measures were made to ensure the safety of the Flyover bridge during tunneling as 6 piers were directly above tunnel with the cushion of 6 to 8m.