History
Gunma-Ōtsu Station opened on 7 March 1971 as an unstaffed station on the Agatsuma Line in what is now Naganohara, Gunma Prefecture. It was prefixed "Gunma" to distinguish it from the older Ōtsu Station on the Tōkaidō Main Line; JNR's customary practice would have used the old province name "Kōzuke," but that would have produced confusion with Ueno Station, so the prefecture name was substituted instead, a convention the line shares with Gunma-Haramachi, Gunma-Fujioka, Gunma-Yawata and Gunma-Sōja. The station was absorbed into the JR East network at the 1987 privatisation of Japanese National Railways and joined the Tokyo metropolitan suburban zone on 1 October 2014. The station has a single side platform with a small shelter, no station building, and is managed from Naganohara-Kusatsuguchi Station.
History summarized from Japanese & English Wikipedia · last reviewed 2026-05-18.