Delhi Metro history:
how it was built, phase by phase

Table: Delhi Metro milestones (DMRC, PIB and contemporary reporting)

First section inaugurated

24 Dec 2002

DMRC network in 2026

370+ km

Record journeys in one day (8 August 2025)

81.9 lakh

Train punctuality reported for 2026

99.95%

By the 1990s Delhi was choking. The city relied on buses and private vehicles, road traffic and pollution were rising fast, and earlier proposals for a mass rapid transit system had stalled for decades. In 1995 the Government of India and the Government of the National Capital Territory of Delhi set up the Delhi Metro Rail Corporation as a joint venture to build one¹.

The decision that shaped everything else was choosing E. Sreedharan, a railway engineer who had delivered the difficult Konkan Railway along India's west coast, as managing director in 1997. Sreedharan ran DMRC as a small, autonomous organisation with fixed deadlines published in advance. Phase I opened sections ahead of schedule, which gave the project a public credibility rare for Indian infrastructure at the time³.

Construction began in 1998, and on 24 December 2002 the first section, from Shahdara to Tis Hazari on today's Red Line, was inaugurated². Phase I then added the underground Yellow Line through the old city and the business district of Connaught Place, and the Blue Line to the west and east, reaching about 65 km by 2006⁴.

Phase I set the design pattern for the network: mostly elevated viaducts on single pillars in the road median, which are quicker and cheaper to build than tunnels, with underground sections only where the city was too dense, such as Chandni Chowk and Connaught Place. Early trains used India's broad gauge; later lines switched to the international standard gauge, which allowed lighter, off-the-shelf rolling stock.

Phase II was the great expansion: about 125 km of new line, roughly tripling the network, built largely in the run-up to the 2010 Commonwealth Games⁴. It extended the network across the Yamuna and into the satellite cities of Noida and Gurugram, and added the Airport Express line, opened in February 2011, with check-in facilities in the city.

The pace of construction was extraordinary for an Indian city. It also produced the project's darkest moment: in July 2009 a section of an under-construction viaduct collapsed at Zamrudpur, killing six workers. Sreedharan offered his resignation, which was not accepted, and DMRC tightened its safety reviews.

Phase III added about 160 km, including two new long lines that run around rather than into the centre: the Pink Line and the Magenta Line. These lines changed travel patterns by letting people cross the city without changing in the crowded core. On 28 December 2020, the Magenta Line began India's first driverless train operations, using communication-based train control.

Phase IV, approved in 2019, is extending these lines. On 8 March 2026, new sections opened on the Magenta Line and the Pink Line, completing the Pink Line as India's first ring metro¹. With these openings, the DMRC network passed 370 km.

The Delhi Metro was designed not only to move trains but to introduce millions of people to a new way of travelling. Several design decisions did that work.

When a Delhi Metro train brakes, its electric motors work as generators and feed electricity back into the overhead line for other trains to use. In 2007 this made DMRC the first rail project in the world registered under the United Nations' Clean Development Mechanism to earn carbon credits, for its regenerative braking⁵⁶. The system, supplied with trains by Bombardier, cut the energy needed to run the trains substantially.

Ridership has grown with the network. DMRC's previous record of 78.67 lakh journeys on 18 November 2024⁷ was broken on 8 August 2025, the eve of Raksha Bandhan, with 81,87,674 passenger journeys in a day. In 2026 DMRC reported average daily ridership of about 64 lakh journeys and 99.95% train punctuality⁸.

Many of the Delhi Metro's first passengers had never used a metro, an escalator or an automatic gate. Designing for them is the same problem every app faces with first-time users.

• Teach by doing, at the moment of need — staff at gates showed people how to tap a token, rather than relying on posters.
• Name things simply — colour-named lines are easier to remember than numbered or company-named ones.
• Make the most common journey effortless — fast gates and frequent trains removed friction from the main task.
• Design for safety and trust first — women-only coaches and platform doors addressed fears that would otherwise keep people away.
• Keep promises visible — published opening dates that were met built the trust that made people try it.

These are the same principles we look at in an onboarding audit: where new users hesitate, and what would let them succeed the first time.

Dates come from DMRC, the Press Information Bureau and contemporary reporting; phase lengths from published project summaries, which differ slightly between sources, so they are given as approximations. Ridership and punctuality figures are DMRC's, as reported by PTI and The Tribune. The carbon-credit registration is from the UNFCCC's CDM records. Photographs are from Wikimedia Commons, credited under each. Last reviewed October 2026.