India’s Largest TBM Clears Factory Test for Thane-Borivali Twin Tunnel

The first of four mega tunnel boring machines (TBMs) for Mumbai’s Thane-Borivali Twin Tunnel project has successfully cleared factory acceptance tests at Herrenknecht’s facility in Alinjivakkam, Tamil Nadu. Designated TBM S-1400A, it is the largest TBM ever used in Mumbai’s infrastructure projects and will construct India's longest urban tunnel. Megha Engineering & Infrastructures Ltd. (MEIL) is executing the 11.84 km project under MMRDA, using single-shield hard-rock TBMs supplied by German manufacturer Herrenknecht AG.