Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Kaiky Line is an 87.8-kilometre railway line operated mainly by the Hokkaido Railway Company. The line runs from Naka-Oguni Station in Sotogahama, Aomori, through the Seikan Tunnel between Honsh and Hokkaid , and on to Kikonai Station in Kikonai, Hokkaid . Two stations on the Tsugaru-Kaiky Line, Tappi-Kaitei Station and Yoshioka-Kaitei Station, are inside the Seikan Tunnel. Several of Japan Railway's night train services use the Kaiky Line between Honsh and Hokkaid ; from Osaka, from Tokyo, and towards Hakodate and Sapporo.