In a critical milestone for the city's developing metro network, the Tunnel Boring Machine (TBM) 'Disha' working on the Mumbai Metro Line 7A corridor is slated to break ground today, completing a key portion of the underground tunnel. The breakthrough symbolises the completion of a 1.647-kilometer tunnel between Andheri (East) and Chhatrapati Shivaji Maharaj International Airport (CSMIA). This tunnel, with a final diameter of 6.35 meters, is the first underground tunnel built by the Mumbai Metropolitan Region Development Authority (MMRDA) as part of the metro system.
Metropolitan Commissioner Dr. Sanjay Mukherjee said this is a great achievement. Today, April 17, 2025, the TBM for Metro Line 7A makes a breakthrough, completing the first underground tunnel in Mumbai's metro network by MMRDA. This engineering marvel makes it possible to connect the operating Red Line (Line 7), which runs from Dahisar to Gundavali, to the airport extension.
The much-delayed Yellow Line Mumbai Metro 2B reached a milestone on Sunday when a 5.4-kilometer length of the line between Diamond Garden in Chembur and Mandale in Mankhurd went active. This indicates that the overhead wires are now considered 'live'. Officials said that the first train trial on this line was conducted on April 16, was successful. This will be the first new Metro line to serve the eastern suburbs in ten years, following the Blue Line 1's launch from Ghatkopar. The other three lines serve the western suburbs. The timeframe for starting operations was December 2025.
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This substantial development will improve local connectivity between Mankhurd and Chembur. The Yellow Line Metro 2B is equipped with high-end six-coach train sets manufactured by Bharat Earth Movers Limited. The passenger train sets are constructed in-house and feature all-steel integral rail carriages as well as an energy-efficient regenerative braking system. The trains have four doors on each side and are designed to accommodate commuters with bicycles. It includes features like mobile charging stations, an IP-based announcement system, and cutting-edge surveillance systems.