Larsen & Toubro werd uitgeroepen tot de laagste bieder voor het 5,05 km lange UG1 ondergrondse civiele werkcontract tussen Mominpur en Esplanade op de Kolkata Metro Purple Line. This northern and final section of the 15,215 km line-3 (Joka to Esplanade/BBD Bagh) will consist of two tunnels that will connect four underground stations: Kidderpore, Victoria, Park Street and Esplanade. L&T will be required to install two new tunnel boring machines (TBMs) with one TBM on standby if and when granted.

RVNL had requested bids for this contract in July 2022, with an estimated value of Rs 2571.28 crore. Technical bids were opened in February, revealing three bidders. L&T's bid of Rs 2447 was 4.82% lower than RVNL's estimate.