Hokkaido Shinkansen
Until the opening of the Hokkaido Shinkansen, these services usually operated on the 1966 built Nanae to Ōnuma section, bypassing (then) Oshima-Ono and Niyama. Now that Shin-Hakodate-Hokuto (formerly Oshima-Ono) is the major connection between the Hokkaido Shinkansen and "zairaisen" (local line) services on the Hakodate Main Line, these services have been re-routed accordingly.