Tunnel boring machine (TBM) DZ-1124 achieved its first breakthrough at Indira Gandhi National Open University (IGNOU) station for package DC-09 under Delhi metro project phase-IV on February 25, 2025. It was commissioned in December 2023 at Chhattarpur Mandir station and travelled for 1,479 metres till IGNOU station.
The scope of work under the package involves design and construction of twin tunnel (up and down line) by shield TBM, cut and cover tunnel box, underground ramp and four underground stations namely Chattarpur, Chhattarpur Mandir, IGNOU and Neb Sarai with entry/exits and connecting subways from chainage 5.35 km to 11.86 km of Aerocity-Tughlakabad corridor. Larsen & Toubro Limited (L&T) was awarded the contract for the same in March 2022.
Delhi metro project – phase IV involves development of 112.4 km long metro rail network comprising six corridors with an investment of Rs 468 billion. The three corridors to be developed on priority basis are Maujpur-Mukundpur (12.31 km), Janakpuri West-RK Ashram (29.26 km) and Aerocity-Tughlakabad (23.62 km). Whereas the other three corridors approved in 2024 by the central government are Inderlok-Indraprastha (12.37 km), Lajpat Nagar-Saket G Block (8.38 km) and Rithala-Narela-Kundli (26.46 km).