Pink Line (Delhi Metro)

The Pink Line (Line 7) or Pink Circular Line is a line of the Delhi Metro, a rapid transit system in Delhi, India. It consists of 46 stations out of which 43 stations are on the main line (Circular line) and 3 stations on the branch line with Maujpur - Babarpur as the common interchange station for both the lines. Spanning a total length of 73.49 kilometres (45.66 mi), It is Delhi Metro's — and India's — longest metro line. The Pink Line is India's first operational ring metro. It is also informally known as the Ring Road Line, as it mostly passes alongside the city's Inner Ring Road.

The Pink Line has interchanges with most of the operational lines of the network, such as the Red Line at Netaji Subhash Place & Welcome, Yellow Line at Azadpur & Dilli Haat - INA, Green Line at Punjabi Bagh West, Blue Line at Rajouri Garden, Mayur Vihar Phase-I, Anand Vihar & Karkarduma, Dhaula Kuan of Airport Express (Orange Line) at Durgabai Deshmukh South Campus, Violet Line at Lajpat Nagar, and Magenta Line at Majlis Park. It also has connections with Hazrat Nizamuddin and Anand Vihar Terminalrailway stations, Sarai Kale Khan and Anand ViharNamo Bharat (RRTS) stations, and the ISBTs at Sarai Kale Khan and Anand Vihar.

The Pink Line has the second highest point above ground on the Delhi Metro at Dhaula Kuan with a height of 23.6 metres (77 ft), passing over the Dhaula Kuan grade separator flyovers and the Airport Express Line. It possesses the country's smallest metro station, Ashram, with a size of just 151.6 metres (497 ft) against the usual 265 metres (869 ft). The usual platform length for a six-coach train on this route is 140 metres (459 ft) but it has been reduced to 135 metres (443 ft) in Ashram station.

The service operating on the ring in the clockwise direction is also known as Circular Line(+) while the service in the anti-clockwise direction is also known as Circular Line(-). The branch line to Shiv Vihar has separate services; passengers have to change platforms at Maujpur - Babarpur to continue on the main route. Unlike the Blue Line, it does not have a designated line number assigned. Stations on the circular line mention the service name as Circular Line(+) or (-), via the next station in the moving direction. Eg.: In Rajouri Garden metro station, the train on Circular Line(-) goes via Mayapuri.

Currently, only the Hyundai Rotem trains ply on the whole route. All new Alstom Metropolis trains have arrived at the Mukundpur Depot and have not been deployed yet in service.