Delhi Metro represents a rapid transit system that provides various services for Delhi and its satellite cities of Noida, Gurgaon, Faridabad, Ghaziabad, Ballabhgarh, and Bahadurgarh in the National Capital Region of India. Currently, it is the largest and busiest subway in India and the second oldest after the Kolkata Metro. The system includes eleven color-coded regular lines that are serving 285 stations. The total length of all lines equals 348 kilometers. The complex has a mix of at-grade, underground and elevated stations and is using both standard-gauge and broad-gauge. Subway operates over 2700 trips daily.
The concept of a mass rapid transit system of New Delhi first started because of a travel and traffic characteristics study, which was carried out in the city in 1969. Over the next years, a lot of official committees were commissioned to examine the issues that were related to route alignment, technology, and Governmental jurisdiction. In 1984, the Urban Arts commission proposed the development of a multi-modal public transportation complex, which included constructions of three underground mass rapid transit corridors and augmenting already existent suburban railway and road transport systems.
When technical studies and the raising of finance were still in progress, the city expanded in terms of a twofold rise of population and a five-fold increase in the number of vehicles from 1981 to 1998. For rectifying a situation, The Government of India and the Government of Delhi together set up a company named the Delhi Metro Rail Corporation. Elattuvalapil Sreedharan was selected as the managing director of the corporation.
Physical construction works started on 1 October 1998. DMRC was entirely in charge of hiring people and making decisions regarding control funds and tenders. The DMRC hired the Hong Kong MTRC, which assisted as a technical consultant on rapid transit operation and construction techniques. Due to joint efforts, the construction went smoothly.
The Delhi Metro was built in three phases. Phase I consisted of a 65 km long route that included 58 stations. Thirteen kilometers of the way is underground, and the rest 52 are either elevated or on the surface. By inaugurating the Dwarka-Barakhamba Road corridor of the Blue Line Phase, I was completed in October 2006. Phase II of the network consists of approximately 124.6 km of route and includes 85 stations. The PhasePhase was fully completed when its last line opened in 2011.
Phase III consists of 28 underground stations, two lines, and eleven route extensions.