 the mumbai metro () is a metro system serving the city of mumbai. the system is designed to reduce traffic congestion in the city, and supplement the existing, but severely overcrowded mumbai suburban railway network. it will be built in three phases over a 15-year period, with overall completion expected in 2021. when complete, the core system will comprise three high-capacity metro railway lines, spanning a total of . line 1 of the mumbai metro is operated by mumbai metro one pvt ltd (mmopl), a joint venture company formed by reliance infrastructure, veolia transport and the mumbai metropolitan region development authority (mmrda). in june 2006, the then prime minister of india, manmohan singh inaugurated the first phase of the mumbai metro project. construction work began in february 2008. a successful trial run was conducted in may 2013,{{cite web|url=http://www.livemint.com/politics/drjn4fpnssy2mgpbr4b91k/mumbai-the-connected-city.html|title=mumbai: the conne
Mumbai_Metro Rapid_transit_in_India Transport_in_Mumbai Underground_rapid_transit_in_India