Delhi Metro Rail Corporation
Delhi Metro Rail Corporation (DMRC) is a centre-state joint venture that operates the Delhi Metro, Rapid Metro Gurgaon, Noida Metro, Patna Metro and Mumbai Metro Line 3. The DMRC is also involved in the planning and implementation of metro rail, monorail, and high-speed rail projects in India, and abroad.
Source: Wikipedia — Delhi Metro Rail Corporation (CC BY-SA 4.0)