 The fleet consists of four 7000-0 series sets, which were originally JR East 701-1000 series sets transferred from Morioka in December 2002, and three newly built 7000-100 series sets.The section of the line between Morioka and Metoki first opened on 1 September 1891, and was nationalized on 1 November 1906.The line was double-tracked by 12 July 1968, and it was electrified on 22 August 1968.