Tokyu Den-en-toshi Line

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.