Ōu Main Line
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| Company | East Japan Railway Company |
| Total Distance | 486.3km (Fukushima — Aomori, Tsuchizaki — Akitakō) |
| Rail Gauge | 1067mm
1435mm |
| Stations | 102 |
| Tracks | Dual-track
Single-track |
| Electrification | All (Alternating Current 20,000V 50Hz) |
| Block System | Automatic Block System
Gearing Block System |
The Ōu Main Line (奥羽本線) is a rail line in Japan. Part of the East Japan Railway Company, it runs from Fukushima Station in Fukushima, Fukushima through Akita Station in Akita, Akita to Aomori Station in Aomori, Aomori, Aomori Prefecture. Since the opening of the Yamagata Shinkansen on July 1, 1992, the Fukushima — Yamagata section (as well as the Yamagata — Shinjō section since 1999) is known as the Yamagata Line. See Yamagata Line for further details on this section.
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Route Data
- East Japan Railway Company
- Total distance: 486.3km (Fukushima — Aomori, Tsuchizaki — Akitakō)
- East Japan Railway Company
- 484.5km (Fukushima — Aomori)
- Japan Freight Railway Company
- 1.8km (Tsuchizaki — Akitakō) (第一種鉄道事業者)
- 256.2km (Yokote — Aomori) (第二種鉄道事業者)
- 4.8km (Aomori — Aomori Stoplight Station)
- East Japan Railway Company
- Rail Gauge:
- 1067mm
- Shinjō — Ōmagari
- Akita — Aomori
- 1435mm
- Fukushima — Yamagata
- Uzen-Chitose — Shinjō
- Both (1067, 1435mm)
- Yamagata — Uzen-Chitose
- Ōmagari — Akita
- 1067mm
- Stations: 102 (including freight stations)
- Tracks:
- Dual-track
- Fukushima — Sekine
- Akayu — Akayu Stoplight Station
- Uzen-Nakayama — Uzen-Chitose
- Ashisawa — Funagata
- Nozoki — Innai
- Ōmagari — Oiwake
- Ugo-Iizuka — Hachirōgata
- Kado — Moritake
- Tsurugata — Maeyama
- Takanosu — Hayaguchi
- Ōdate — Nagamine
- Ishikawa — Kawabe
- Single-track
- Sekine — Akayu
- Akayu Stoplight Station — Uzen-Nakayama
- Uzen-Chitose — Ashisawa
- Funagata — Nozoki
- Innai — Ōmagari
- Oiwake — Ugo-Iizuka
- Hachirōgata — Kado
- Moritake — Tsurugata
- Maeyama — Takanosu
- Hayaguchi — Ōdate
- Nagamine — Ishikawa
- Kawabe — Aomori
- Dual-track
- Electrification: All (Alternating Current 20,000V 50Hz)
- Block system: Automatic block system (except Tsuchizaki — Akitakō section (gearing block system))
- Rail yard: Yamagata, Akita
- (The Jingūji — Mineyoshikawa section consists of two 1435mm tracks and one dual-gauge track)
Service
The Ōu Main Line is split into the following four sections. Due to the differences in the tracks of these sections, there are no trains that go through more than one (with the exception of an Akita — Shinjō connection).
Fukushima — Shinjō (148.6km)
On this section the Ōu Main Line shares the tracks with the Yamagata Shinkansen. The rail gauge is 1435mm to allow the Yamagata Shinkansen to run on it. The Ōu Main Line is known as the Yamagata Line on this section.
Shinjō — Ōmagari (98.4km)
Crossing the Yamagata-Akita border, there is little demand in this section, and all trains run as local trains.
Ōmagari — Akita (51.7km)
On this section the Ōu Main Line shares the tracks with the Akita Shinkansen. Because the Ōu Main Line occasionally runs from Akita to Shinjō as a local train, this section contains one standard gauge track and two narrow gauge tracks. Also, the few Komachi trains running on this section have the priority.
Akita — Aomori (185.8km)
In addition to the Kosei Line, Hokuriku Main Line, Shin'etsu Main Line, Hokushin Line, and the Uetsu Main Line, the Ōu Main Line shares this track with the express lines and freight lines tha make up the "Nihon Kaijū-kan Line".
Timeline
The Ōu North Line began in Aomori, the South Line in Fukushima, and the full line began operation in 1905.
Ōu North Line
- December 1, 1894: Aomori — Hirosaki
- October 21, 1895: Hirosaki — Ikarigaseki
- June 21, 1899: Ikarigaseki — Shirasawa
- November 15, 1899: Shirasawa — Ōdate
- October 7, 1900: Ōdate — Takanosu
- Novermber 1, 1901: Takanosu — Noshiro (present-day Higashi-Noshiro)
- August 1, 1902: Noshiro — Gojōme (present-day Hachirōgata)
- October 21, 1902: Gojōme — Akita
- October 1, 1903: Akita — Wada
- August 21, 1904: Wada — Jingūji
- December 21, 1904: Jingūji — Ōmagari
- June 15, 1905: Ōmagari — Yokote
Ōu South Line
- May 15, 1899: Fukushima — Yonezawa
- April 11, 1901: Yonezawa — Yamagata
- August 23, 1901: Yamagata — Tateoka (present-day Murayama)
- October 21, 1901: Tateoka — Ōishida
- July 21, 1902: Ōishida — Funagata
- June 11, 1903: Funagata — Shinjō
- October 21, 1904: Shinjō — Innai
- July 5, 1905: Innai — Yuzawa
- September 14, 1905: Yuzawa — Yokote, completion of Fukushima — Aomori connection
Ōu Main Line
- April 29, 1949: Fukushima — Yonezawa section changed to direct current electrification
- November 1, 1960: Yamagata — Uzen-Chitose section changed to direct current electrification
- September 8, 1968: Yamagata — Uzen-Chitose section changed to alternating current electrification
- September 22, 1968: Fukushima — Yonezawa section changed to alternating current electrification
- September 23, 1968: Yonezawa — Yamagata section changed to alternating current electrification
- August 25, 1971: Akita — Aomori section changed to alternating current electrification
- October 13, 1975: Uzen-Chitose — Akita section changed to alternating current electrification, entire line becomes electric-powered
- April 1, 1987: becomes part of the East Japan Railway Company with the breakup of Japan National Railway
- September 1, 1991: Fukushima — Yamagata section temporarily ceases operations for construction of Yamagata Shinkansen, switch-back between Akaiwa and Ōsawa is abolished
- July 1, 1992: Yamagata Shinkansen begins operation, Fukushima — Yamagata section is known as Yamagata Line
- March 22, 1997: Akita Shinkansen begins operation, Jingūji — Mineyoshikawa section becomes three-track
- March 12, 1999: Tendō — Shinjō section temporarily ceases operations for further construction of Yamagata Shinkansen, Torigoe Stoplight Station is abolished
- October 22, 1999: Uzen-Chitose — Shinjō section temporarily ceases operations for further construction of Yamagata Shinkansen
- December 4, 1999: Yamagata Shinkansen construction finishes, Yamagata — Shinjō section is also known as the Yamagata Line, Kanisawa is renamed Sakurambo-Higashine, Tateoka is renamed Murayama
