Herrenknecht, a tunnel boring machine manufacturer, has completed factory acceptance tests (FAT) for TBMs S-710 and S-1134. These will be used in the construction of the 65.1 km Delhi Metro Phase 4 project.

Afcons Infrastructure will now use both refurbished Earth Pressure Balance (EPB) machines, each with a diameter of 6.63m, as well as two additional machines, to build twin tunnels for Package DC-05 of the Magenta Line's 28.92 km Janakpuri West - RK Ashram extension.

DMRC awarded Afcons a contract for package DC-05 worth 24.81 billion with a 42-month deadline in January 2022.

Package DC-05 is a 7.46-kilometer underground section that will connect a ramp north of Derawal Nagar to RK Ashram. The section has six stations: Derawal Nagar, Ghanta Ghar, Pulbangash (which connects to the Red Line), Sadar Bazar, Nabi Karim, and Ramakrishna Ashram Marg (which provides an interchange with the Blue Line).

TBM S-710 was previously used by Afcons between 2015 and 2017, when it was deployed for Phase 1's Package UAA-01 between Egmore and May Day Park - Washermenpet. Later, between 2018 and 2020, the machine was transported to Ahmedabad and used for Phase 1's Package-1 between East Ramp, Kankaria East, and Kalupur.

See also:
DMRC: Delhi to house India's first National Metro Rail Knowledge Centre
35,000 mn for RRTS, no funds marked for Delhi Metro