The Delhi Metro is a mass rapid transit (MRT) system serving Delhi and its adjoining satellite cities such as Ghaziabad, Faridabad, Gurugram, Noida and Bahadurgarh, in the National Capital Region of India.[10] The Delhi Metro network consists of 10 colour-coded lines[1] serving 256 stations[a] with a total length of 350.42 kilometres (217.74 mi).[c] It is the largest and busiest metro rail system in India, and the second oldest after the Kolkata Metro. The system has a mix of underground, at-grade, and elevated stations using both broad-gauge and standard-gauge tracks. The Delhi Metro operates over 4,300 trips daily.[12]

Delhi Metro Rail Corporation Limited (DMRC), a company with equal equity participation from the Government of India and the Government of Delhi, built and operates the Delhi Metro.[16][17] DMRC was certified by the United Nations in 2011 as the first metro rail and rail-based system in the world to get carbon credits for reducing greenhouse gas emissions, reducing carbon emission levels in the city by 630,000 tonnes every year.[6]


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The concept of mass rapid transit for New Delhi first emerged from a traffic and travel characteristics study that was carried out in the city in 1969.[21] Over the next several years, many official committees by a variety of government departments were commissioned to examine issues related to technology, route alignment, and governmental jurisdiction.[21] In 1984, the Urban Arts Commission came up with a proposal for developing a multi-modal transport system, which would consist of constructing three underground mass rapid transit corridors as well as augmenting the city's existing suburban railway and road transport networks.[22]

While extensive technical studies and the raising of finance for the project were in progress, the city expanded significantly resulting in a two-fold rise in population and a five-fold rise in the number of vehicles between 1981 and 1998.[22] Consequently, traffic congestion and pollution soared, as an increasing number of commuters took to private vehicles with the existing bus system unable to bear the load.[21] An attempt at privatizing the bus transport system in 1992 merely compounded the problem with inexperienced operators plying poorly maintained, noisy and polluting buses on lengthy routes, resulting in long waiting times, unreliable service, extreme overcrowding, unqualified drivers, speeding and reckless driving[23] which even led to road accidents. To rectify the situation, the Government of India under Prime Minister H.D. Deve Gowda[24] and the Government of Delhi jointly set up a company called the Delhi Metro Rail Corporation (DMRC) on 3 May 1995, with Elattuvalapil Sreedharan as the managing director.[25] Sreedharan handed over the charge as managing director of DMRC to Mangu Singh on 31 December 2011.[26]

A total of 123.3 kilometres (76.6 mi) long network with 86 stations and the following 10 new routes and extensions was built, out of which seven routes are extension spurs of the Phase I network, three were new colour-coded lines and three routes connect to other cities (Yellow Line to Gurgaon, Blue Line to Noida and Blue Line to Ghaziabad) of the national capital region, outside the physical limits of Delhi state, in the states of Haryana and Uttar Pradesh. At the end of Phases I and II, the cumulative total length of the network became 188.05 km (116.85 mi) with 145 stations progressively becoming operational from 4 June 2008 to 27 August 2011.[6]

Driverless operations on the 38 km (24 mi) long Magenta line began on 28 December 2021, making it the first driverless metro line of Delhi Metro and India's first driverless metro.[50] On 25 November 2021, the 59 km (37 mi) long Pink Line also began driverless train operations. With this, the total stretch of DMRC's network under driverless operations now stands at close to 97 km (60 mi), putting Delhi Metro in fourth position globally among such networks, marginally behind Kuala Lumpur.[51]

The Yellow Line is the first line of Delhi Metro which has phased out all four coach trains with six and eight-coach configurations. The Metro Museum at Patel Chowk metro station, the only museum about metro railway in South Asia, is a collection of display panels, historical photographs and exhibits, tracing the genesis of the Delhi Metro.[88] The museum was opened on 1 January 2009.[80]

Opened in 2010, Green Line (Line 5) is the fifth line of the Delhi Metro network and the first line on standard gauge, as opposed to previous broad gauge lines. It runs between Inderlok (a station on the Red Line) and Brigadier Hoshiyar Singh with a branch line connecting the line's Ashok Park Main station with Kirti Nagar station on the Blue Line. The completely elevated line, built as part of Phase II of the Delhi Metro runs mostly along the busy NH 10 route in West Delhi. The line consists of 24 stations including an interchange station covering a total length of 29.64 km (18.42 mi). This line also has the country's first standard-gauge maintenance depot at Mundka.[97]

The Violet Line is the sixth line of the Metro to be opened, and the second standard-gauge corridor after the Green Line. The 47-kilometre-long (29 mi) line connects Raja Nahar Singh in Ballabgarh via Faridabad to Kashmere Gate in New Delhi, with 26 km (16 mi) being overhead and the rest underground. The first section between Central Secretariat and Sarita Vihar was inaugurated on 3 October 2010, just hours before the inaugural ceremony of the 2010 Commonwealth Games, and connects the Jawaharlal Nehru Stadium, which was the venue for the opening and closing ceremonies of the event.[98] Completed in just 41 months, it includes a 100-metre-long (330 ft) bridge over the Indian Railways mainlines and a 167.5-metre-long (550 ft) cable-stayed bridge across an operational road flyover and connects several hospitals, tourist attractions, and a major industrial estate along its route. Services are provided at intervals of 5 min.[98][99] An interchange with the Yellow Line is available at Central Secretariat through an integrated concourse. On 14 January 2011, the remaining portion from Sarita Vihar to Badarpur was opened for commercial service, adding three new stations to the network and marking the completion of the line.[100]

Interchanges are available with Yellow Line at New Delhi, Blue Line at Dwarka Sector 21, Durgabai Deshmukh South Campus metro station of Pink Line at Dhaula Kuan & with the Indian Railways network at New Delhi.

It consists of 25 metro stations from Janakpuri West to Botanical Garden. The Magenta Line provide direct connectivity to Terminal 1D of Indira Gandhi International Airport. The Hauz Khas station on this line and the current Yellow Line is the deepest Metro station at a depth of 29 metres (95 ft), surpassing the record set by Chawri Bazaar station on the Yellow Line, at a depth of 25 metres (82 ft).[118] The Magenta line has interchanges with the Yellow Line at Hauz Khas, Blue Line at Janakpuri West and Botanical Garden, and Violet Line at Kalkaji Mandir of the Delhi Metro network.

The Grey Line (also known as Line 9) is the shortest route in the system. It connects Dwarka to Dhansa Bus Stand in the western part of Delhi. It covers around 4.295 km (2.669 mi) and comprises four stations: Dhansa Bus Stand, Najafgarh, Nangli and Dwarka. The line has an interchange with Blue Line at Dwarka Station. The Najafgarh to Dwarka section was opened to the public on 4 October 2019. The extension to Dhansa Bus Stand was scheduled to open in December 2020, but construction got delayed due to the COVID-19 pandemic, and was subsequently inaugurated on 18 September 2021.[120]

Phase IV of the network with a length of 103 km (64 mi) and 6 lines was finalized by the Government of Delhi in December 2018.[126] Approval from Government of India was received for 3 priority corridors in March 2019.[127] Construction work on these 3 priority corridors having a length of 65.1 km (40.5 mi) commenced on 30 December 2019, with an expected completion date of 2025.[128] Therefore, at the end of Phase IV, the total length of the Delhi Metro will exceed 450 kilometres (280 mi),[129][47] which does not include other independently operated systems in the National Capital Region such as the 29.7 kilometres (18.5 mi) long Aqua Line of the Noida-Greater Noida Metro[130] and the 11.7 kilometres (7.3 mi) of the Rapid Metro Gurgaon that connect to the Delhi Metro.[131][132] This may make Delhi Metro the 7th longest metro system by route length after Shanghai Metro, Beijing Subway, Guangzhou Metro, Shenzhen Metro, Chengdu Metro and Hangzhou Metro.

The trains operate at a frequency of one to two minutes to five to ten minutes between 05:00 and 00:00, depending upon the peak and off-peak hours. Trains operating within the network typically travel at speed up to 75 km/h (47 mph) and stop for about 20 seconds at each station. Automated station announcements are recorded in Hindi and English. Many stations have services such as ATMs, food outlets, cafs, convenience stores and mobile recharge. Eating, drinking, smoking, and chewing gum are prohibited in the entire system. The Metro also has a sophisticated fire alarm system for advance warning in emergencies, and fire retardant material is used in trains as well as on the premises of stations.[151] Navigation information is available on Google Maps.[152] Since October 2010, the first coach of every train is reserved for women. However, last coaches are also reserved when the train changes tracks at the terminal stations in the Red, Green and Violet Lines.[153][154] To make travelling by metro a smoother experience, Delhi Metro has launched its own official mobile app Delhi Metro Rail for smartphone users,(iPhone and Android) that will provide information on various facilities like the location of the nearest metro station,[155] fare, parking availability, tourist spots near metro stations, security and emergency helpline numbers.[156] e24fc04721

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