NHSRCL lowers cutterhead for second TBM at Sawli under the Mumbai-Ahmedabad High-Speed Rail Corridor Project in Maharashtra May 26, 2026 | High Speed Rail Corridor, Mega Programmes, Project Updates, Under Construction National High Speed Rail Corporation Limited (NHSRCL) lowered the cutterhead measuring 13.6 m in diameter and weighing 350 tonnes for second Tunnel Boring Machine (TBM)…. This content is restricted.