On this past Saturday morning, Tunnel Boring Machine S197 deployed by HCC Ltd for contract CC-66 of Delhi Metro’s Phase 3 project made its first successful breakthrough in Najafgarh! This EPBM TBM was originally commissioned from the Sai Baba Shaft on November 2 2015 and completed tunneling 665 meters (475 rings) for the westbound down-line tunnel of the 4.3 km Dwarka-Najafgarh line.
The breakthrough took place at a shaft adjacent to the local Hanuman Mandir, just east of the Najafgarh station. Google Maps is yet to update its imagery since excavation started in mid 2015:
A post-breakthrough video can be seen here.
Since a single TBM is being used by the contractor, the TBM will now be pushed out, u-turned & launched once again to finish the parallel east-bound up-line tunnel. All of these activities along with some minor repair work are expected to take a total of 3 months.
Track-laying work on the elevated section (Dwarka-Nangli) of this line started earlier this month (see images). The Delhi Metro Rail Corportation has not yet communicated if they’ll begin commercial operations to Nangli Metro station or wait until all tunneling works to the Najafgarh station are completed. If they choose to wait, then trains will start running through this corridor only in 2018.
For more updates, check out the Delhi section of The Metro Rail Guy!