Mumbai‑Ahmedabad Bullet Train: Second Tunnel Boring Machine Starts Digging

The much‑talked‑about Mumbai‑Ahmedabad bullet‑train corridor is moving forward at a noticeable pace. After the successful launch of the first tunnel boring machine (TBM) last year, a second, even larger, TBM rolled onto the site this week, marking the start of a new tunnelling stretch.

Dubbed “Shakti”, the 7.5‑metre‑diameter machine is being operated by a joint venture of Indian and Japanese firms. Its massive cutterhead began turning at a shallow depth near the town of Karjat, aiming to carve a twin‑track tunnel that will eventually link the bustling suburbs of Mumbai with the historic city of Ahmedabad.

Why does this matter? Aside from shaving months off the overall schedule, the second TBM allows engineers to work on parallel sections of the underground alignment. In practical terms, it means less disruption on the surface and a smoother, faster construction rhythm.

Officials say the bullet‑train project, pegged at around ₹1.1 trillion (roughly $13 billion), will span approximately 508 km once completed. Trains are expected to whiz between the two metros in just under two hours, shaving off a good three‑plus hours compared with current road travel.

Both machines are equipped with state‑of‑the‑art monitoring systems that relay real‑time data on pressure, soil conditions and alignment. This information helps the crew adjust parameters on the fly, reducing the risk of delays caused by unexpected ground conditions.

Local residents have expressed a mix of excitement and caution. While many look forward to the promise of faster travel and the economic boost that typically follows such infrastructure, there are concerns about noise and vibration during the tunnelling phase. Contractors have reassured the community that modern TBMs are designed to minimise surface impact.

When the tunnelling work is completed, the line will feature 12 stations, cutting‑edge signalling, and rolling stock sourced from Japan’s Shinkansen technology. The project is part of India’s broader push to modernise its transport network and reduce congestion on its over‑burdened highways.

With “Shakti” now chipping away at the earth, the narrative is clear: the Mumbai‑Ahmedabad high‑speed rail is no longer just a vision on paper. It’s steadily becoming a tangible reality, inching India closer to a new era of rapid, reliable rail travel.