Passage: Kubatanidza zvitsuwa zveHonshu neHokkaido nekubatana kwakagadziriswa kwaive kwafungidzirwa kubvira panguva yeTaishō (1912<unk>1925), asi kuongorora kwakakomba kwakatanga chete muna 1946, kwakakonzerwa nekurasikirwa kwenzvimbo dzekunze kwenyika pakupera kweHondo Yenyika II uye kudiwa kwekugamuchira vanhu vakadzoka. Muna 1954, maferi mashanu, kusanganisira iyo Tōya Maru, yakanyura muTsugaru Strait panguva yedutu, ichiuraya vafambi 1,430. Gore rakatevera, Japanese National Railways (JNR) yakakurumidza kuferefeta mugero. Chimwe chinonetsa kwaive kuwedzera kwekufamba pakati pezvitsuwa zviviri. Hupfumi hwekukura hwakaona huwandu hwekufamba paJNR-yakashanda Seikan Ferry yakapetwa kaviri kusvika pa4,040,000 vafambi / gore kubva muna1955, uye huwandu hwekutakura zvinhu hwakakwira zvakapetwa ka1.7 kusvika pamatani mazana matanhatu nemakumi maviri nemana / gore.
Kubva muna 1955 kusvika muna 1965