New Delhi, Jan. 2 -- A significant milestone was achieved in India's first bullet train corridor with the breakthrough of a high-speed mountain tunnel at Maharashtra's Palghar, Ashwini Vaishnaw, Minister of Railways, said on Friday.

"A major milestone has been achieved in the Bullet Train Project. This milestone is the breakthrough of Mountain Tunnel-5. In the entire Bullet Train Project, there are seven mountain tunnels and one undersea tunnel," Ashwini Vaishnaw said in a press conference.

The total length of the project spans 508 kilometres, with tunnels covering 27.4 kilometres, of which 21 kilometres are underground and 6.4 kilometres are surface tunnels. The project includes eight mountain tunnels, seven in Maharashtra, totalling 6...