Namma Metro (literally “Our Metro”) is India’s second largest metro system in terms of both length and number of stations, after the Delhi Metro. It is also ranked the 99th largest metro system in terms of length and 92nd largest metro network in terms of number of operating stations in the world. It also contains the first underground metro line in South India. The metro network consists of two colour-coded lines, with a total length of 31.52 kilometres serving 30 stations. The system has a mix of underground, at-grade, and elevated stations using standard-gauge tracks. The metro has an average daily ridership of 110,000 passengers Bangalore Metros is being built in Phases.
Purple Line – The first 6.7-kilometre (4.2 mi), 6-station stretch of the Purple Line between Baiyappanahalli and Mahatma Gandhi Road opened on 20 October 2011 and was the inaugural section of the Namma Metro. The second 6.4-kilometre (4.0 mi), 6-station stretch of the Purple Line between Mysore Road and Magadi Road opened on 16 November 2015. The first underground section of South India, a 4.8 km stretch from Cubbon Park to Bangalore City Railway Station opened on 29 April 2016, thereby completing the entire 18.22 km Purple Line stretch of the metro network.
Green Line – The first 9.9-kilometre (6.2 mi), 10-station stretch of the Green Line opened 1 March 2014. The stretch connected Sampige Road to Peenya Industry.The second 2.5-kilometre (1.6 mi), 3-station stretch of the Green Line, operating between Peenya Industry and Nagasandra, opened 1 May 2015. Phase 2 includes the extension of the two Phase 1 corridors, as well as the construction of two new lines. The south-end of the Green Line will be extended from Puttenahalli to Anjanapura Township along the Kanakapura Road and the north-end from Hesarghatta Cross to Bangalore International Exhibition Center (BIEC) on Tumkur Road (NH-4). The east-end of the Purple Line will be extended from Baiyappanahalli to Whitefield and the west-end from Mysore Road to Kengeri.
High Speed rail Link to Airport – There was a proposal to build a 33 km line known as Bangalore High-Speed Rail Link, from MG Road to Bengaluru International Airport (BIA), at a cost of ₹5,767 crore (US$860 million). In September 2016, RITES suggested nine possible extensions from the existing and proposed metro lines to the airport. The nine proposed extensions have an average length of 30 km, and each is estimated to cost between ₹4,500 crore and ₹7,000 crore.