Current Route Information

Line	First operational	Last Extension	Stations	Length (km)	Terminals		Rolling stock
Red Line	December 24, 2002	June 4, 2008	21	25.15	Dilshad Garden	Rithala	23 trains
Yellow Line	December 20, 2004	September 3, 2010	34	44.65	Jahangirpuri	HUDA City Centre	45 trains
Blue Line	December 31, 2005	October 30, 2010	44	49.93	Noida City Centre	Dwarka Sector 21	59 trains
	January 7, 2010	July 14, 2011	8	8.75	Yamuna Bank	Vaishali
Green Line	April 3, 2010	—	15	18.46	Inderlok	Mundka	13 trains
Violet Line	October 3, 2010	January 14, 2011	15	20.04	Central Secretariat	Badarpur	29 trains
Airport Express	February 23, 2011	-	6	22.70	New Delhi	Dwarka Sector 21	8 trains

Red Line

The Red Line was the first line of the Metro to be opened and connects Rithala in the west to Dilshad Garden in the east, covering a distance of 25.09 kilometres (15.59 mi). It is partly elevated and partly at grade, and crosses the Yamuna River between Kashmere Gate andShastri Park stations The inauguration of the first stretch between Shahdara and Tis Hazari on December 24, 2002, caused the ticketing system to collapse due to the line being crowded to four times its capacity by citizens eager to have a ride.^[ Subsequent sections were inaugurated from Tis Hazari – Trinagar (later renamed Inderlok) on October 4, 2003, Inderlok – Rithala on March 31, 2004, and Shahdara – Dilshad Garden on June 4, 2008.

Yellow Line

The Yellow Line was the second line of the Metro and was the first underground line to be opened. It runs for 44.36 kilometres (27.56 mi) from north to south and connects Jahangirpuri with HUDA City Centre. The northern and southern parts of the line are elevated, while the central section through some of the most congested parts of Delhi is underground. The first section between Vishwa Vidyalaya and  Kashmere Gate opened on December 20, 2004, and the subsequent sections of Kashmere Gate – Central Secretariat opened on July 3, 2005, and Vishwa Vidyalaya – Jahangirpuri on February 4, 2009.This line also possesses the country's deepest Metro station at Chawri Bazaar, situated 30 metres (98 ft) below ground level. On 21 June 2010, an additional stretch from Qutub Minar to HUDA City Centre in Gurgaon was opened, initially operating separately from the main line. However, Chhatarpur station on this line opened on August 26, 2010. Due to delay in acquiring the land for constructing the station, it was constructed using pre-fabricated structures in a record time of nine months and is the only station in the Delhi metro network to be made completely of steel.^[ The connecting link between Central Secretariat and Qutub Minar opened on September 3, 2010. Interchanges are available with the Red Line at Kashmere Gate station, and with the Indian Railways network at Delhi and New Delhi railway stations.

Blue Line

The Blue Line was the third line of the Metro to be opened, and the first to connect areas outside Delhi. Partly overhead and partly underground, it connects Dwarka Sub City in the west with the satellite city of Noida in the east, covering a distance of 47.4 kilometres (29.5 mi).The first section of this line between Dwarka and Barakhamba Road was inaugurated on December 31, 2005, and subsequent sections opened between Dwarka – Dwarka Sector 9 on April 1, 2006, Barakhamba Road – Indraprastha on November 11, 2006, Indraprastha – Yamuna Bank on May 10, 2009, Yamuna Bank – Noida City Centre on November 12, 2009, and Dwarka Sector 9 - Dwarka Sector 21 on October 30, 2010.This line crosses the Yamuna River between Indraprastha and Yamuna Bank stations, and has India's firstextradosed bridge across the Northern Railways mainlines near Pragati Maidan. A branch of the Blue line, inaugurated on January 8, 2010, takes off from Yamuna Bank station and runs for 6.25 kilometres (3.88 mi) up to Anand Vihar in east Delhi. It was further extended up to Vaishali which was opened to public on July 14, 2011.A small stretch of 2.76 kilometres (1.71 mi) from Dwarka Sector 9 toDwarka Sector 21 was inaugurated on October 30, 2010. Interchanges are available with the Yellow Line at Rajiv Chowk station, and with the Indian Railways network at the Anand Vihar Railway Terminal.

Green Line

Opened in 2010, the Green Line was the first standard-gauge corridor of the Delhi Metro. The fully elevated line connects Mundka with Inderlok, running for 15.1 kilometres (9.4 mi) mostly along Rohtak Road. An interchange with the Red line is available at Inderlok station via an integrated concourse.This line also has the country's first standard-gauge maintenance depot at Mundka.

Violet Line

The Violet Line is the most recent line of the Metro to be opened, and the second standard-gauge corridor after the Green Line. The 20.2 km (12.6 mi) long line connects Badarpur to Central Secretariat, with 9 km (5.6 mi) being overhead and the rest underground. The first section between Central Secretariat and Sarita Vihar was inaugurated on October 3, 2010, just hours before the inaugural ceremony of the 2010 Commonwealth Games, and connects the Jawaharlal Nehru Stadium which is the venue for the opening and closing ceremonies of the event. Completed in just 41 months, it includes a 100 m (330 ft) long bridge over the Indian Railways mainlines and a 167.5 m (550 ft) long 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. An interchange with the Yellow Line is available at Central Secretariat through an integrated concourse. On January 14, 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.

Airport Express

The Airport Express line runs for 22.7 km (14.1 mi) from New Delhi Railway Station to Dwarka Sector 21, linking the Indira Gandhi International Airport. The line is operated, by the Delhi Airport Metro Express Pvt. Limited (DAMEL), a subsidiary of Reliance Infrastructure, the concessionaire of the line. Constructed at a cost of 2,885 crore (US$643.36 million), the line has six stations (Dhaula Kuan and Delhi Aerocity became operational on August 15, 2011), with some featuring check-in facilities, parking and eateries. Rolling stock consists of six-coach trains operating at intervals of ten minutes and having a maximum speed of 135 km/h (84 mph). Originally scheduled to open before the 2010 Commonwealth Games, the line failed to obtain the mandatory safety clearance, and was opened on 24 February 2011, after a delay of around 5 months.