Sōbu Main Line

Sōbu Main Line
Sōbu/Yokosuka Line E217 series EMU
Technical
Track gauge	1,067 mm (3 ft 6 in)
Electrification	1,500 V DC

Route map

Legend Outline west of Chiba Chūō Main Line - 4.3 Ochanomizu "Chūō-Sōbu Line" Keihin Tōhoku Line Akihabara 0.0 Tokyo Yokosuka Line (R)"Sōbu Line (Rapid)" Ryōgoku 4.8 0.0 Kinshichō - 11.7 Etchūjima Freight Kameido Etchūjima freight line 7.2 0.0 Koiwa Shinkane freight line - 8.9 Kanamachi Jōban Line 20.6 Nishi-Funabashi Musashino Line 26.7 Tsudanuma Details east of Chiba Rapids stop: R with limited service: r Commuter Rapids stop: C (L)Chūō-Sōbu Line Chiba Urban Monorail 39.2 Chiba Uchibō, Sotobō lines (old) Chiba Chiba Urban Monorail Line 2 40.1 Higashi-Chiba    Chiba Urban Monorail Line 1 43.4 Tsuga RC Chiba Urban Monorail Line 1 46.9 Yotsukaidō RC 51.1 Monoi R  55.3 Sakura RC Narita Line 59.3 Minami-Shisui r  62.2 Enokido r  65.9 Yachimata r  71.7 Hyūga r  76.9 Narutō r  Tōgane Line 82.5 Matsuo 86.8 Yokoshiba 90.6 Iigura 93.7 Yōkaichiba 98.8 Higata 103.6 Asahi 106.3 Iioka 109.2 Kurahashi 111.8 Saruda Narita Line 117.3 Matsugishi 120.5 Chōshi Chōshi Electric Railway Line

Sōbu Line 113 series train at Narutō Station

211 series EMU

The Sōbu Main Line (総武本線 Sōbu-honsen) is a Japanese railway line operated by the East Japan Railway Company (JR East) in Japan. It connects Tokyo with the east coast of Chiba Prefecture, passing through the cities of Funabashi, Chiba, and Chōshi. Its name derives from the old provinces of the area which it serves: Musashi (武蔵国), Shimōsa (下総国) and Kazusa (上総国). Its official line color is yellow.

Definition

The character of the line changes at Chiba. The western, urbanized section is informally, but commonly, called the Sōbu Line (総武線 Sōbu sen) without using "Main". The "Main Line", in popular usage, refers to the trains operated east of Chiba on the line.

Signs at stations and in trains, and vocal announcements in trains, both maintain this distinction: with Main for the eastern rural section; without Main for the western frequent travel zone.^[1]

Description

• Distances:
  • Tokyo - Chōshi: 120.5 km
  • Kinshichō - Ochanomizu: 4.3 km
  • Shin-Koiwa - Etchūjima Freight (Etchūjima freight line): 11.7 km
  • Shin-Koiwa - Kanamachi (Shinkane freight line): 8.9 km
• Electrification: DC 1500 V excluding the non electrified Etchūjima freight line
• Tracks
  • Quadruple: Kinshichō - Chiba
  • Double: Tokyo - Kinshichō, Kinshichō - Ochanomizu, Chiba - Sakura
  • Single: Sakura - Chōshi, Shin-Koiwa - Etchūjima Freight, Shin-Koiwa - Kanamachi

Operation

Local trains run between Ochanomizu and Chiba Station and are called the Chūō-Sōbu Line (中央・総武線) or Sōbu-Local Line (総武緩行線 Sōbu-Kankō). Rapid trains are also operated from Tokyo Station to Chiba Station and use different tracks from the local service trains. The rapid trains are called Sōbu Kaisoku Line (総武快速線 Sōbu Kaisoku sen (Sōbu Rapid Line)). For the most part, these trains use the same track, except when they reach Tokyo: Sōbu-Kankō trains continue onto the Chūō Line, while Sōbu-Kaisoku trains continue onto the Yokosuka Line.

The following sections describe trains east of Chiba. For details west of Chiba, see the relevant articles.

Limited express

The Narita Express to Narita Airport Station and the Ayame to Chōshi use the Sōbu Main and Narita Lines for their journey.

Shiosai, also a Limited Express service, from Tokyo Station to Chōshi also uses this line.

Stations

Tokyo - Kinshichō - Chiba

See Sōbu Line (Rapid) for rapid trains.

Ochanomizu - Kinshichō - Chiba

See Chūō-Sōbu Line for local trains.

Chiba - Chōshi

For distances, connections and stops of rapid trains, see the route diagram.

Station		Location
Chiba	千葉	Chūō-ku, Chiba
Higashi-Chiba	東千葉
Tsuga	都賀	Wakaba-ku, Chiba, Chiba
Yotsukaidō	四街道	Yotsukaidō, Chiba
Monoi	物井
Sakura	佐倉	Sakura, Chiba
Minami-Shisui	南酒々井	Shisui, Chiba
Enokido	榎戸	Yachimata, Chiba
Yachimata	八街
Hyūga	日向	Sanmu, Chiba
Narutō	成東
Matsuo	松尾
Yokoshiba	横芝	Yokoshiba, Chiba
Iigura	飯倉	Sōsa, Chiba
Yōkaichiba	八日市場
Higata	干潟	Asahi, Chiba
Asahi	旭
Iioka	飯岡
Kurahashi	倉橋
Saruda	猿田	Chōshi, Chiba
Matsugishi	松岸
Chōshi	銚子

Rolling stock

• 209 series EMUs
• 211-3000 series EMUs (local services since 21 October 2006)^[2]
• E217 series EMUs

Past rolling stock

• 113 series EMUs

History

Private construction

Initially, the line was constructed by a private company, Sōbu Railway (総武鉄道 Sōbu Tetsudō). It opened the first service sections, between Ichikawa and Sakura on July 20, 1894, and extended to Tokyo City. In December of the same year, Honjo (本所, present Kinshichō) was opened, and in 1904, on the east bank of Sumida River, Ryōgokubashi (両国橋) (now Ryōgoku) became a terminal of this line. The access routes to the west, to Tokyo City, were tramways for passengers and ships for freight. From Sahara to the east, this line reached another terminus, Chōshi in 1897.

Nationalisation

The line was nationalized in 1907 under the Railway Nationalization Act, and was double-tracked from Ryōgokubashi to Chiba the next year. The predecessor of the Japanese National Railways (JNR) planned to connect with other lines inside Tokyo. In 1932, a new passenger line was opened from Ochanomizu to Ryōgoku (with new platform besides the original terminal facility), and a frequent service of EMUs commenced. Electrification to Chiba was completed in 1935, and local trains have run through from the Chūō line since then. But, except for a few trains, no rapid service was operated on this line, and the passengers had to use the local train, or its rival, Keisei Electric Railway.

Bombing of Tokyo

On March 10, 1945, the Bombing of Tokyo caused casualties estimated at 70,000–100,000, and destroyed stations of the line. During the last days of World War II in 1945, the Imperial Japanese Army thought the US Army would attempt a landing operation, "Operation Coronet", on Kujūkuri Beach, and transferred troops on the Sōbu Main Line.

Steam trains

Between Chiba and Chōshi, in the rural area of Chiba Prefecture, steam traction was used until recently. Fish and soy sauce from Chōshi were major freight items. Because Tokyo was close, JNR did not provide rapid or express trains from Ryōgoku to Chōshi until 1958. JNR operated tourist trains from Ryōgoku to the seaside resorts on the coast from the 1950s.

Five-destination operation

In the 1960s, JNR started the Five-Destination Operation (五方面作戦 Go Hōmen Sakusen) to steeply increase commuter demand, and it determined that a new rapid line would be constructed from Tokyo Station to Chiba. A new underground line from Tokyo to Kinshichō, and a four-tracked section to Tsudanuma were opened in 1972, and the operator began frequent rapid services from Tokyo to Chiba. The line was managed by the East Japan Railway Company (JR East) from 1987. The parallel Keiyō Line was opened closer to the coast in 1990. It was first constructed for freight services but later to carry passengers.

Further electrification

To the east of Chiba, electrification reached Chōshi in 1974, and Limited Express Shiosai has been operated from the underground Tokyo Station since 1975. Freight services from Chōshi ceased in 1986, just before the privatization of JNR, and regular passenger trains stopped using the Ryōgoku terminal platforms in 1988. JR East started a new airport train, the Narita Express in 1991. Rapid urbanization around Chiba Station made this section important for commuter traffic, for the city of Chiba, and for Greater Tokyo.

Former connecting lines

• Shimosa-Nakayama station (see Chuo-Sobu Line) - A 2 km 610mm gauge human powered line, built to haul sweet potatoes and firewood, but which also carried passengers from 1911, operated to Kamagaya between 1908 and 1918.
• Yachimata station - The Narita Railway Co. opened a 14 km, 600mm (~1'11.5") gauge line to Sanrizuka in 1917. In 1928 the line was converted to 1067mm gauge in conjunction with the extension of the Tako Line (see next entry) to Youkaichiba via Sanrizuka. The line closed in 1940.
• Youkaichiba station - The Narita Railway Co. operated the Tako line, 30 km in length, to Narita between 1928 and 1944.

References

• JTB (ed.) (2008). "JTB Jikokuhyō" JTB時刻表 [JTB Timetable].
• Ministry of Land, Infrastructure and Transport (ed.) (2000). Heisei 13 Nendo-ban Tetsudō Yōran 平成13年度版鉄道要覧 [Railway Directory FY2001] (in Japanese). Tokyo: (鉄道図書刊行会, Tetsudōtosho Kankōkai). pp. 34, 60, 279, 292. ISBN 4-88548-099-X.

1. This custom is also seen in Chūō Main Line and less in Tōkaidō Main Line
2. "10/21, 房総211系, 営業運転開始" [Boso 211 series enter service]. Japan Railfan Magazine (in Japanese). Vol. 47 no. 549 (Japan: Koyusha Co., Ltd.). January 2007. p. 179.