The Delhi Metro(Hindi: दिल्ली मेट्रो),(abbreviated to DMRC) is an state owned company with equal equity participation from Government of India and Government of National Capital Territory of Delhi. However, the organization is under administrative control of Ministry of Urban Development, Government of India. Delhi Metro is a rapid transit system serving Delhi, Gurgaon, Noida and Ghaziabad in the National Capital Region of India. Delhi Metro is India's first modern public transportation system,which has revolutionized travel by providing a fast, reliable, safe and comfortable means of transport.The network consists of six lines with a total length of 189.63 kilometres (117.83 mi) with 142 stations of which 35 are underground, five are at-grade and 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.Besides construction and operation of Delhi metro, the 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.

Delhi Metro is being built and operated by the Delhi Metro Rail Corporation Limited (DMRC),(Hindi: दिल्ली मेट्रो रेल निगम लिमिटेड). As of November 2010, DMRC operates around 2,700 trips daily between 6:00 and 23:00 running with an interval of 2 minutes 30 seconds between trains at peak frequency. The trains are mainly of four coaches, but due to increase in the number of passengers, six-coach trains are also added on the Yellow Line (Jahangirpuri to HUDA city centre), Blue Line (Dwarka sec −21 to Vaishali/NOIDA city centre),Violet Line (Central Secretariat to Badarpur) and Green line (Inderlok/Kirti nagar to Mundka).The power output is supplied by 25-kilovolt, 50 Hertz alternating current through overhead catenary. The metro has an average daily ridership of 1.8 million commuters, and, as of July 2011, had 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 tons (630 Gg) every year.[10]

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 (DMRC) registered on 3 May 1995 under the Companies Act, 1956. Construction started in the 1998, and the first section, on the Red Line, opened in 2002, followed by the Yellow Linein 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.

Current routes
As of August 27, 2011, the whole of Phase-I and Phase-II are complete, with the network comprising six lines with 145 metro stations and a total length of 193 km (120 mi).[1][30]
Line First operational Last Extension Stations Length

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