History
Shimo-Yamaguchi Station opened on 1 May 1929 as a Musashino Railway intermediate stop on its newly built Yamaguchi Line, today's Seibu Sayama Line. The line's primary purpose was tourist access to Sayama Natural Park, and when wartime restrictions designated the route a non-essential line on 28 February 1944 services and the station were both suspended. Operations resumed on the renamed Sayama Line in October 1951, but this station and Kami-Yamaguchi remained closed and were formally decommissioned in October 1954. Increasing housing demand reopened the stop on 4 June 1976, and the Lions Stadium opening in 1978 prompted a 1981 conversion to an island platform with passing-loop capability.
History summarized from Japanese & English Wikipedia · last reviewed 2026-05-18.
Notes
The station name uses "Shimo-Yamaguchi" although no district called "Shimo-Yamaguchi" exists in Tokorozawa City — only a "Kami-Yamaguchi" area; the stop's actual address sits in the unqualified Yamaguchi district.