Delhi Metro is a metro system serving Delhi metropolitan area and its satellite cities of Gurgaon, Noida, Faridabad and Ghaziabad in the National Capital Region of India. Delhi Metro is the world's thirteenth largest metro system in terms of length and a member of Nova Group of Metros. Delhi Metro is India's third urban mass rapid transport system, after the Kolkata Metro and Chennai MRTS. It is India's first modern rapid transit system too. As of December 2014, the network consists of five colour-coded lines , plus a sixth Airport Express line, with a total length of 193 kilometres , serving 140 stations , of which 38 are underground, five are at-grade, and the rest are elevated. All stations have escalators, elevators, and tactile tiles to guide the visually impaired from station entrances to trains. It has a combination of elevated, at-grade, and underground lines, and uses both broad gauge and standard gauge rolling stock. Four types of rolling stock are used: Mitsubishi Rotem broad gauge, Bombardier Movia, Mitsubishi Rotem standard gauge, and CAF Beasain standard gauge. Delhi Metro Rail Corporation Limited , a state-owned company with equal equity participation from Government of India and Government of National Capital Territory of Delhi built and operates the Delhi Metro. However, the organisation is under administrative control of Ministry of Urban Development, Government of India. Besides construction and operation of Delhi Metro, DMRC is also involved in the planning and implementation of metro rail, monorail and high-speed rail projects in India and providing consultancy services to other metro projects in the country as well as abroad. As of November 2014, DMRC operates around 3000 trips daily between 05:30 till 00:00 running with an interval of between 3–4 minutes between trains at peak frequency. The trains are usually of four and six coaches, but due to increase in the number of passengers, eight-coach trains are added on the Yellow Line and Blue line . Yellow line being the first one with eight coach trains. The power output is supplied by 25-kilovolt, 50-hertz alternating current through overhead catenary. The metro has an average daily ridership of 2.4 million commuters, and, as of August 2010, had already carried over 1.25 billion commuters since its inception. The Delhi Metro Rail Corporation has been certified by the United Nations as the first metro rail and rail-based system in the world to get "carbon credits for reducing greenhouse gas emissions" and helping in reducing pollution levels in the city by 630,000 tonnes every year. Planning for the metro started in 1984, when the Delhi Development Authority and the Urban Arts Commission came up with a proposal for developing a multi-modal transport system for the city. The Government of India and the Government of Delhi jointly set up the Delhi Metro Rail Corporation registered on 3 May 1995 under The Companies Act, 1956. Construction started in 1998, and the first section, on the Red Line, opened in 2002, followed by the Yellow Line in 2004, the Blue Line in 2005, its branch line in 2009, the Green and Violet Lines in 2010, and the Delhi Airport Metro Express in 2011. The recently opened Rapid MetroRail Gurgaon, whilst linked to it by the Yellow Line is a separate metro system , although tickets from the Delhi Metro can be used in its network.
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