Rail Vikas Nigam Limited (RVNL) has awarded a large metro project to Larson & Toubro (L&T) for the Design and Construction of an Underground Metro Project in connection with the Joka – Esplanade Metro Corridor in Kolkata, West Bengal, India.

The project encompasses the "Planning and Implementation of Ramp and Subterranean Metro Railway Infrastructure" over a distance of 5.05 km, extending from Mominpur (excluding) to Esplanade (including), encompassing the chainage points from 9063.00m to 14113.00m. This initiative includes the establishment of 4 subterranean stations, namely Khidderpore, Victoria, Park Street, and Esplanade. The project encompasses a range of activities including the construction of tunnels through the utilization of Tunnel Boring Machine and Cut & Cover methods, architectural finishing tasks, track installations, and more.

Referred to as the Purple Line, Line 3, spanning 15 km, will traverse both underground and above-ground sections, connecting Joka in the city's southern region to Esplanade in the northern part. The contract's exact value falls within the range of US$303 million to US$605 million.