Passenger service began on 3 March 1986 between Minami-Funabashi and Chibaminato, and was extended eastward to Soga and westward to Shin-Kiba on 1 December 1988.
Layanan penumpang dimulai pada 3 Maret 1986 antara Minami-Funabashi dan Chibaminato, dan diperpanjang ke arah timur menuju Soga dan barat menuju Shin-Kiba pada 1 Desember 1988.