Mezue ahịrịokwu na-esonụ: Kamaishi Station mepere na 17 Septemba 1939. Usoro Kamakishi bidoro ọrụ site na 11 Ọktoba 1944. Ebe ọdụ ụgbọ ahụ ghọkwara ọdụ ọdụ maka Miyako Line na 27 February 1972. E mere ka nke a bụrụ nke onwe na 1 Eprel 1987, wee bụrụ Sanriku Railway South Rias Line. Kamaishi Station bụ nke JR East webatara mgbe privatization nke Japanese National Railways (JNR) na 1 Eprel 1987. Ihe
Ala ọma jijiji na tsunami nke Tōhoku nke 2011 na 11 Machị 2011 bibiri ọtụtụ n'ime egwu na ọtụtụ ọdụ nke Yamada Line n'etiti Miyako na Kamaishi. N'ọnwa Febụwarị n'afọ 2012, JR East tụrụ aro ka e kpochapụ ngalaba a nke Yamada Line ma jiri ụzọ ahụ dị ka ụzọ ụgbọ ala na-agba ọsọ ọsọ (BRT) mana mkpebi a mechara tụgharịa ma weghachite ụzọ ahụ na-echere ịnyefe na Sanriku Railway. Na 23 Machị 2019, ngalaba Yamada Line site na Miyako ruo Kamaishi mepere ma nyefee ya na Sanriku Railway. Nke a jikọtara ya na Line Kita-Rias n'otu akụkụ na Minami-Rias Line n'akụkụ nke ọzọ nke jikọtara ọnụ bụ Line Rias dum. N'ihi ya, ọdụ a ghọrọ ọdụ dị n'etiti Rias Line.