The line opened as a one-stop single-track spur from Chōfu to Keiō-Tamagawa on 1 June 1916, electrified at 600 V DC, and was double-tracked on 1 April 1924. On 1 May 1937, Tamagawara was renamed Keiō-Tamagawa, and on 4 August 1963, the voltage was increased to 1,500 V DC.[citation needed]
The line was extended (all extensions were electrified dual track) on 1 April 1971, to Keiō-Yomiuri-Land.[1] Subsequent extensions brought the line to Keiō-Tama-Center (18 October 1974), Minami-Ōsawa (22 May 1988) and Hashimoto (30 March 1990). Tamasakai station opened on 6 April 1991.[citation needed]
In 2012, the Chofu to Keiō-Tamagawa section was relocated underground.
Station numbering was introduced on 22 February 2013.[2]
This article incorporates material from the corresponding article in the Japanese Wikipedia.
^"京王相模原線、きょう開業" [Keio Sagamihara Line, Opening Today]. Kotsu Shimbun. 18 October 1974. p. 1.
^"京王線・井の頭線全駅で「 駅ナンバリング」を導入します。" [We will introduce "station numbering" at all stations on the Keio Line and Inokashira Line.] (PDF). keio.co.jp (in Japanese). 18 January 2013. Archived from the original(PDF) on 23 January 2013. Retrieved 17 July 2022.