Mumbai-Ahmedabad Bullet Train TBMs Arrive at JNPT, Ending China-Linked Delays
In a significant breakthrough for India's ambitious high-speed rail corridor, two Tunnel Boring Machines (TBMs) destined for the underground stretch of the Mumbai-Ahmedabad bullet train project have arrived at Jawaharlal Nehru Port on Monday. This development comes after months of delays tied to geopolitical factors that had held up consignments in China, threatening the timelines of the Rs 1.08 lakh crore project.
Shipment Details and Logistics
Officials confirmed that the shipment includes the remaining components of the first TBM, whose cutter head reached Mumbai around September 24, 2025, along with the complete set of parts for the second machine. Sources revealed, "The consignment left China in early March, reached Chennai port, and was dispatched for Mumbai on March 18." The TBMs, though procured from German firm Herrenknecht, were manufactured at its Guangzhou facility and had been stranded at a Chinese port earlier this year without formal clearance.
Diplomatic Resolution and Project Impact
The delay emerged as a major concern, prompting intervention through diplomatic channels. The railways ministry coordinated with the external affairs ministry to address the issue. Sources indicated that the matter was also flagged during Prime Minister Narendra Modi's interaction with Chinese President Xi Jinping on the sidelines of the Shanghai Cooperation Organisation summit in August 2025. This resolution aligns with a broader easing of economic engagement between India and China, where the Centre recently relaxed certain investment norms for firms with limited Chinese shareholding, signaling a calibrated approach to improving business ties while maintaining strategic safeguards. Officials noted that such measures have helped smooth project-linked clearances and logistics.
Underground Work to Commence Soon
With both TBMs now arriving, work on the underground package can move forward aggressively. Boring is expected to begin in approximately three months after assembly and testing are completed. The machines are equipped with a mixshield configuration, specifically designed to cut through complex geology. They will be deployed for the 20.37-kilometer underground section between Bandra Kurla Complex (BKC) and Shilphata, which includes a challenging 7-kilometer subsea tunnel beneath Thane Creek.
Technical Challenges and Project Scope
The underground package, being executed by Afcons Infrastructure Ltd, represents one of the most demanding components of India's first high-speed rail corridor. The bullet train project is designed for speeds of up to 320 kilometers per hour. The tunnel will run at depths ranging from 25 to 65 meters below the surface, dipping to as much as 114 meters beneath Parsik Hill near Shilphata. The National High-Speed Rail Corporation Limited (NHSRCL) plans to deploy two TBMs initially, with an option to use a third if required to meet deadlines. The tunnelling will create a single-tube passage carrying both up and down tracks of the bullet train, showcasing advanced engineering feats.
This arrival marks a pivotal step in overcoming logistical hurdles and advancing a project set to transform transportation infrastructure in the region.
