The section from Morioka to Shizukuishi opened on 25 June 1921, as the Hashiba Light Railway (橋場軽便), and was extended to Hashiba on 2 September 1922.^[1] Services to Hashiba Station ended in the 1940s.

In 1964, the Shizukuishi to Akabuchi section opened, and upon completion of the 3,915 m (2.433 mi) Sengan Tunnel, the Akabuchi to Tazawako section opened on 20 October 1966, completing the line.^[1]

Freight services ceased in 1982, the year the entire line was electrified.^{[citation needed]}

In 1997, the line was converted to 1,435 mm (4 ft 8+1⁄2 in) gauge, and became part of the Akita Shinkansen, with standard-gauge electric multiple unit (EMU) trains providing local services on the line.

In January 2022 it was announced that Maegata Station would be added between Morioka Station and Ōkama Station.^[2] Maegata station opened for service on 18 March 2023.

Passing loops

• Ōchizawa passing loop (大地沢信号場, Ōchizawa-shingōjō) is a passing loop located in Shizukuishi, Iwate. (39°40′29″N 140°50′31″E / 39.674763°N 140.842074°E / 39.674763; 140.842074)
• Shidonai passing loop (志度内信号場, Shidonai-shingōjō) is a passing loop located in Senboku, Akita.(39°41′25″N 140°46′48″E / 39.690316°N 140.780134°E / 39.690316; 140.780134)

Rolling stock edit

As of 2022, 701-5000 series trains belonging to Akita General Rolling Stock Center are used on this line.

• Stations of the Tazawako Line (JR East) (in Japanese)