Underground excavation has entered a crucial new phase on the Mumbai Bullet Train corridor with tunnel boring operations commencing from Vikhroli towards the Bandra Kurla Complex station. The milestone marks significant progress on India’s first high-speed rail project, advancing one of the country’s most technically challenging transport infrastructure programmes while strengthening long-term regional connectivity between Maharashtra and Gujarat. The latest construction phase involves the deployment of a large tunnel boring machine (TBM) to excavate a single-tube underground section that will accommodate train movement in both directions. Engineers have initiated operations from a deep launch shaft constructed at Vikhroli, from where the machine will advance towards the underground station planned at Bandra Kurla Complex, Mumbai’s key commercial district.
The underground section represents one of the most complex engineering components of the Mumbai Bullet Train project. Of the 21-kilometre tunnel alignment in the Mumbai region, a substantial portion will be excavated using specialised tunnel boring machines, while the remaining stretch has already been completed through the New Austrian Tunnelling Method, an internationally recognised technique widely used for complex underground construction. Project authorities indicate that overall physical progress on the high-speed rail corridor has crossed approximately 80 per cent across Maharashtra and Gujarat. The 508-kilometre network is designed to connect major urban and industrial centres while significantly reducing travel time between Mumbai and Ahmedabad through high-speed rail operations. Infrastructure specialists note that underground tunnelling beneath densely populated urban areas requires sophisticated engineering, continuous ground monitoring and precise construction techniques to minimise surface disruption. Large-diameter tunnel boring machines also improve construction safety by reducing open excavation and limiting impacts on existing transport corridors and surrounding neighbourhoods.
The project forms part of India’s broader effort to modernise intercity mobility through high-capacity, energy-efficient rail transport. Compared with road and domestic air travel, electrified high-speed rail has the potential to reduce transport-related carbon emissions over the long term, provided it is supported by clean electricity generation and integrated with sustainable urban mobility systems. Urban planners also emphasise that high-speed rail investments can stimulate economic development beyond travel time savings. Improved regional connectivity often encourages business investment, supports transit-oriented development around stations and strengthens labour mobility across metropolitan regions. However, experts stress that maximising these benefits will depend on seamless integration with local metro systems, suburban rail services and public transport networks. Construction of the corridor is scheduled to be commissioned in phases, with initial operations planned on sections in Gujarat before the full route is extended towards Mumbai. As tunnelling progresses beneath one of India’s most densely developed urban regions, the Mumbai Bullet Train project continues to test the country’s engineering capabilities while highlighting the importance of resilient, low-carbon transport infrastructure for future urban growth.
The coming stages will focus on advancing underground excavation, station construction and systems integration, with the long-term objective of creating a high-speed rail corridor capable of supporting sustainable economic development while enhancing regional mobility across western India.
