Afcons and Transtonnelstroy to build underwater train tunnel for Kolkata’s metro system March 23, 2010 | Asia Pacific News India’s Afcons Infrastructure Limited together with Russia-based Transtonnelstroy Limited has won a INR9.38 billion contract to build an underwater train tunnel from the Kolkata Metro Railway Co... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password