 The 15 km Goryōkaku – Oshima-Ono section was electrified in conjunction with the opening of the Hokkaido Shinkansen, with the latter station renamed .- The 17 km Ōnuma-Kōen to Shikabe line opened in 1929, and had the misfortune to be affected by a volcanic eruption just six months later, which closed it for two months.It closed in 1945 when the Shikabe Station on the Sawara line opened, but as the new station was some distance from the township, locals agitated for re-establishment of services to the original station.