Tuhia he haere tonu mō tēnei wāhanga - I whakatuwheratia te teihana o Kamaishi i te 17 o Mahuru 1939. I timata te Raina Kamakishi ki te mahi mai i te 11 o Oketopa 1944. I noho ano te teihana hei teihana mutunga mo te Raina Miyako i te 27 o Hui-tanguru 1972. I whakawhiwhia tenei raina i te 1 o Paenga-whawha 1987, ka noho ko Sanriku Railway South Rias Line. I whakauruhia te teihana Kamaishi ki te whatunga JR Te Tai Rāwhiti i muri i te whakawhiwhinga o te Japanese National Railways (JNR) i te 1 o Paenga-whawha 1987. Ko te ruu o Tōhoku 2011 me te tsunami
i te 11 o Poutu-te-rangi 2011 i whakangaromia te nuinga o nga ara me te maha o nga teihana o te Raina Yamada i waenga i Miyako me Kamaishi. I te Hui-tanguru 2012, i tono a JR East kia whakakorea tenei waahanga o te Raina Yamada ka whakamahia te tika-o-ara hei huarahi tere o te pahi (BRT) engari i muri mai ka hurihia tenei whakatau ka whakahokia te raina i te wa e tatari ana ki te whakawhiti ki te Raina Sanriku. I te 23 o Poutu-te-rangi 2019, i whakatuwherahia te waahanga o te Raina Yamada mai i Miyako ki Kamaishi ka whakawhiti ki Sanriku Railway. I hono atu tenei ki te Raina Kita-Rias i tetahi taha me te Raina Minami-Rias i tetahi atu e noho tahi ana ko te Raina Rias katoa. No reira, ka noho tenei teihana hei teihana takawaenga o te Rias Line.