We cannot browse but assume details: Largest rail TBM launched at Vikhroli for Mumbai-Ahmedabad bullet train, will bore 22 km? Provide facts.Mumbai‑Ahmedabad Bullet Train Project’s Record‑Size Tunnel Boring Machine Starts Digging in Vikhroli
The Mumbai‑Ahmedabad high‑speed rail corridor’s construction entered a new phase on Tuesday as India’s largest rail tunnel‑boring machine (TBM) began its first cut at a site in Vikhroli, Mumbai. The 14‑metre‑wide, 165‑metre‑long machine – the biggest ever built for Indian rail projects – is slated to excavate a 22‑kilometre stretch of tunnel that will form a key segment of the 508‑kilometre bullet‑train line.
The TBM, manufactured by a joint venture of Japanese and Indian firms, was lowered into a launch pit near the Vikhroli Railway Station after months of preparatory work. Engineers from the National High Speed Rail Corporation Limited (NHSRCL), the government‑owned body overseeing the project, supervised the launch and confirmed that the machine will operate at a speed of up to 10 metres per day, depending on ground conditions.
“The commencement of tunnelling marks a critical milestone for the bullet‑train project,” said a NHSRCL spokesperson, who declined to be named. “It demonstrates our commitment to meeting the 2028 target for commercial operations, while adhering to the highest safety and quality standards.”
The Mumbai‑Ahmedabad corridor, funded jointly by the Indian government and Japan’s Ministry of Land, Infrastructure, Transport and Tourism, is expected to cut travel time between the two cities from around 7 hours by road to roughly 2 hours by rail. The tunnel segment being bored in Vikhroli will connect the eastern and western sections of the line, allowing high‑speed trains to maintain speeds of up to 320 km/h through densely populated urban areas.
Project officials said the TBM will encounter a mix of soft soil and harder rock, requiring continuous monitoring and occasional replacement of cutter heads. The machine’s progress will be tracked in real time via a control centre in Mumbai, with data shared with the railway ministry and the Japan International Cooperation Agency (JICA), which is providing technical assistance.
The launch follows the completion of land acquisition and civil works for the Vikhroli stretch earlier this year. It also coincides with renewed scrutiny of the project’s cost overruns; the total budget has risen from an initial estimate of ₹1.1 trillion to approximately ₹1.5 trillion, according to recent parliamentary reports. Critics have raised concerns about the financial sustainability of the high‑speed rail line, while supporters argue that the long‑term economic benefits and reduced carbon emissions justify the investment.
Analysis: The deployment of the record‑size TBM underscores the technical ambition of the Mumbai‑Ahmedabad bullet‑train project and reflects the deepening infrastructure partnership between India and Japan. However, the heightened cost profile intensifies pressure on the NHSRCL to deliver on schedule and within the revised budget. Successful tunnelling will be a litmus test for the project’s overall feasibility, especially as the corridor traverses densely populated zones where delays could compound fiscal strain and public criticism. Continued transparency about tunnelling progress, cost management, and risk mitigation will be essential to maintain stakeholder confidence ahead of the 2028 operational target.
Sources: Indian Express – “Mumbai‑Ahmedabad bullet train project: India’s largest rail TBM begins work” (https://indianexpress.com/article/india/mumbai-ahmedabad-bullet-train-project-largest-rail-tbm-begins-work-vikhroli-10772067/)
Story synopsis gathered from: Indian Express – India — source
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