The Tōkyū Den-en-toshi Line (東急田園都市線) is a major commuter train service connecting Shibuya, Tokyo to Yamato, Kanagawa. The service is operated by the private Tokyo Kyuko Electric Railway company.

History

Due to extensions and line mergers, the Den-en-toshi and associated lines have undergone several confusing renamings.

• July 15, 1927 - The first section of the line from Futako-Tamagawa (then called Futako-Tamagawa-en) to Mizonokuchi opened as the Mizonokuchi Line.
• July 1, 1943 - This section became a part of the Oimachi Line , which ran from Oimachi in southwest Tokyo to Futako-Tamagawa-en.
• October 11, 1963 - The entire Oimachi Line was renamed the Den-en-toshi Line.
• April 1, 1968 - Sections which had been opened incrementally from Mizonokuchi to Nagatsuta were appended to the Den-en-toshi Line.
• April 7, 1977 - A new subway line from Shibuya to Futako-Tamagawa started operation as the Shin-Tamagawa Line . On November 16, 1977, it was connected with through service to Den-en-toshi Line from Futako-Tamagawa. Existing service on the Den-en-toshi Line between Mizonokuchi (and beyond) and Oimachi was maintained.
• August 12, 1979 - The part from Oimachi to Futako-Tamagawa was separated and named the Oimachi Line again, thus restoring its original name and route. This was done to coincide with the inauguration of through service from the Den-en-toshi Line through the Eidan Hanzōmon subway Line (now Tokyo Metro Hanzōmon Line) via the Shin-Tamagawa Line.
• April 9, 1984 - Sections which had been opened incrementally from Tsukimino (beyond Nagatsuta) were appended and the entire length from Shibuya to Chuo-Rinkan was opened.
• August 6, 2000 - the Shin-Tamagawa Line became a part of the Den-en-toshi Line.
• March 19, 2003 - Through service was extended beyond Suitengu-mae to Oshiage and also started running straight through into the Tobu Isezaki Line and Tobu Nikko Line .