Komagawa

Weekday departures: 93/day in the available timetable data · Sat & holiday departures: 63/day in the available timetable data

Earliest / latest departure in the available data (weekday): 5:09 / 23:06

Busiest hour in the available data: 7:00–8:00 (10)

0:00 ─ 23:00

Figures are typical departures in the timetable data, not a live service count.

Timetable data as of 5 May 2026.

The timetable data is incomplete for some or all lines at this station, so the weekday and Sat & holiday figures are departures in the available timetable data, not totals.

Lines where the timetable data is complete: Hachiko Line

Lines where the timetable data is incomplete:

• Kawagoe Line: no timetable data

• Hachiko Line: Moro ⇄ Higashi-Hanno

Komagawa Station opened on 15 April 1933 with the Ministry of Railways' Hachikō Line section between Higashi-Hannō and Ogose, taking its name from the former Komagawa village. The Kawagoe Line from Ōmiya reached the station on 22 July 1940, making it a junction. A private siding to a Nihon Cement plant (later Taiheiyō Cement) ran from May 1963 until withdrawal in September 1999. The Kawagoe Line was electrified on 30 September 1985, and the Hachikō Line south to Hachiōji on 16 March 1996. Operation transferred to JR East at the 1987 privatisation. A new station building entered service on 8 December 2024 and a free east–west passageway opened on 20 March 2026.

The Hachikō Line splits operationally at Komagawa: services run as electrified trains south to Hachiōji and as diesel cars north toward Takasaki, with no direct through-running between the two halves since the 1996 electrification.