The Ministry of Railways shared images of the massive 350-tonne cutterhead measuring 13.6 metres in diameter, which will be used in the tunnelling work for India's first Bullet train project. "The...cutterhead of the second Tunnel Boring Machine has been lowered at Sawli (Ghansoli) near Mumbai for the 21-km underground section of the Mumbai-Ahmedabad High-Speed Rail corridor," the ministry said.