History
Tamagawa-Jōsui Station opened on 15 May 1950 as the terminus of the Seibu Railway's Jōsui Line, which Seibu had created by acquiring a former Hitachi Aircraft Tachikawa-plant siding from Nikko Industries in 1949. The line was renamed the Haijima Line and extended west to Haijima on 15 May 1968, turning Tamagawa-Jōsui into a through stop. On 10 December 1989 the layout was rebuilt as a two-island, three-track station, and the Tama Toshi Monorail platforms opened on 27 November 1998. Concurrent works moved the Seibu platforms, elevated the concourse, opened a new walkway, and removed the previous level crossing. An enclosed waiting room was added on the Haijima Line side in November 2007.
History summarized from Japanese & English Wikipedia · last reviewed 2026-05-18.
Notes
The original station building still stands south of the present concourse: the 1989 structure was retained when the line was elevated in 1998, with its old ticket-window area shuttered and its former entrance plaza converted into a bicycle parking lot.