The District Line is a major line of the London Underground system in London, England. It runs from Upminster in the east to Ealing Broadway and Richmond in the west, covering a distance of about 40 kilometers. The line serves several key areas, including Westminster, Kensington, and Wimbledon, making it an essential route for commuters and tourists alike. Opened in 1868, the District Line is known for its distinctive green color on the Tube map. It operates both above and below ground, with a mix of modern and historic trains. The line connects with multiple other lines, enhancing accessibility across the city.