Nyora kupfuurira kweiyi ndima - Kamaishi Station yakavhurwa musi wa17 September 1939. Kamakishi Line yakatanga kushanda kubva musi wa 11 Gumiguru 1944. Chiteshi ichi chakavawo chiteshi chekupedzisira cheMiyako Line musi wa 27 Kukadzi 1972. Mutsetse uyu wakasarudzwa musi wa 1 Kubvumbi 1987, ukava Sanriku Railway South Rias Line. Chiteshi cheKamaishi chakabatanidzwa muJR East network pakunyoreswa kweJapan National Railways (JNR) musi wa1 Kubvumbi 1987. Kudengenyeka kwenyika uye tsunami yeTōhoku ya2011
musi wa 11 Kurume 2011 yakaparadza mizhinji yenzira nezviteshi zvakawanda zveYamada Line pakati peMiyako neKamaishi. Muna Kukadzi 2012, JR East yakakurudzira zviri pamutemo kuti chikamu ichi cheYamada Line chibviswe uye kodzero-yekufamba ichishandiswa sebhazi rinokurumidza kufamba (BRT) nzira asi danho iri rakazodzoserwa uye mutsetse wakadzorerwa wakamirira kuendeswa kuSanriku Railway. Musi wa 23 Kurume 2019, chikamu cheYamada Line kubva kuMiyako kuenda kuKamaishi chakavhurwazve ndokuendeswa kuSanriku Railway. Iyi yakabatana ne Kita-Rias Line kune rumwe rutivi uye Minami-Rias Line kune rumwe rutivi iyo pamwe chete inoumba iyo yose Rias Line. Nokudaro, chiteshi ichi chakava chiteshi chepakati cheRias Line.