TBM ‘Shakti’: The Tech Behind India’s Longest Railway Tunnel Between Rishikesh and Karnaprayag

India’s longest railway tunnel is currently being constructed deep in the Himalayan mountains. Dubbed Tunnel No. 8 or T-8, it will be a 14.57km tunnel between Rishikesh and Karnaprayag, and connect Devprayag and Janasu in Uttarakhand. While the length of the tunnel in itself is a major engineering achievement, the technology that went into the excavation and constru...

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