The Delhi Metro Rail Corporation was certified by the United Nations in 2011 as the first metro rail and rail-based system in the world to get carbon credits for reducing greenhouse gas emissions; helping reduce pollution in the city by 630,000 tonnes every year. We played a lead role in implementing Phases 1 and 2 of the Delhi Metro. The project included an underground corridor of 6.3 km, an airport expressway below Terminal 3, a 554 m span across the river Yamuna, overhead 25 kV electrification (OHE), a Rigid Overhead Contact System (ROCS) for Phase 2 and testing of depots. In Phase 3, we executed three elevated sections and two underground sections along with two contracts for traction systems.