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The Delhi Metro is a rapid transit system serving Delhi and its satellite cities of Ghaziabad, Faridabad, Gurgaon, Noida, Bahadurgarh and Ballabhgarh, in the National Capital Region of India.[10] It is by far the largest and busiest metro in India, and second oldest after the Kolkata Metro.[11]
The network consists of Ten colour-coded lines[12] serving 253 stations with a total length of 348 kilometres (216 mi) [285 stations with a total length of 389 kilometres (242 mi) including Gurgaon Metro and Noida Metro].[3][4] The system has a mix of underground, at-grade, and elevated stations using both broad-gauge and standard-gauge. Delhi Metro operates over 2,700 trips daily, starting at around 05:00 and ending at 23:30.[13]
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|---|---|---|---|
| Owner | Delhi Metro Rail Corporation | ||
| Locale | National Capital Region | ||
| Transit type | Rapid transit | ||
| Number of lines | 10[1] | ||
| Line number | |||
| Number of stations | 285[2][Nb 1] | ||
| Daily ridership | 4,720,168 (May–June 2019 average)[6][7] | ||
| Key people | Durga Shanker Mishra (Chairman) Mangu Singh (Managing Director)[8] | ||
| Headquarters | Metro Bhawan, Barakhamba Road, New Delhi – 110001 | ||
| Website | www
| ||
| Operation | |||
| Began operation | 24 December 2002 | ||
| Operator(s) | Delhi Metro Rail Corporation | ||
| Number of vehicles | 310 Trains[9] | ||
| Train length | 4/6/8 coaches[9] | ||
| Headway | 3 minutes | ||
| Technical | |||
| System length | 389 km (242 mi)[4] | ||
| Track gauge | 1,676 mm (5 ft 6 in) (Indian gauge; (Red, Blue, Yellow line) 1,435 mm (4 ft 8 1⁄2 in) (Standard gauge) (All lines) | ||
| Electrification | 25 kV, 50 Hz AC OHE | ||
| Top speed | 100 Km/hr | ||
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Construction started in 1998, and the first elevated section (Shahdara to Tis Hazari) on the Red Line opened on 25 December 2002. The first underground section (Vishwa Vidyalaya – Kashmere Gate) on the Yellow Line opened on 20 December 2004.[14] The development of the network was divided into phases. Phase I with 3 lines was completed by 2006, and Phase II in 2011. As of March 2020, Phase III is in the finishing stage and scheduled to be mostly complete by the end of the year. Construction on Phase IV was formally started on 30 December 2019.[15] 
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.[9]
Delhi Metro also interchanges with the Rapid Metro Gurugram (with a shared ticketing system) and Noida Metro. On 22 October 2019, the DMRC took over the operations of the financially troubled Rapid Metro Gurgaon.[18]
