|Locale||Tokyo, Saitama prefectures|
|Rolling stock||205 series, E233-7000 series, TWR 70-000 series EMUs|
|Line length||36.9 km (22.9 mi)|
|Track gauge||1,067 mm (3 ft 6 in)|
|Electrification||1,500 V DC overhead catenary|
|Operating speed||100 km/h (60 mph)|
The Saikyō Line (埼京線 Saikyō-sen?) is a Japanese railway line operated by the East Japan Railway Company (JR East). It runs between Ōsaki Station in Shinagawa, Tokyo, and Ōmiya Station in Saitama Prefecture. The line's name is an abbreviation of the two areas the line connects: Saitama (埼玉?) and Tōkyō (東京?).
At the northern end of the line, some trains continue beyond Ōmiya as far as Kawagoe on the Kawagoe Line; at the southern end of the line, many Saikyō Line trains continue onward beyond Ōsaki to Shin-Kiba on the Rinkai Line (operated by Tokyo Waterfront Area Rapid Transit). Beside the link that connects the Saikyō and Rinkai lines is the JR East Tokyo General Rolling Stock Centre that stores the rolling stock for the Yamanote Line and other types of rolling stock.
- Operator: East Japan Railway Company (JR East) (Services and tracks)
- Double-tracking: Entire line
- Railway signalling:
- Ōsaki – Ikebukuro: Automatic Block System
- Ikebukuro – Ōmiya: Automatic Train Control
- Maximum speed:
- Akabane – Ōmiya: 100 km/h (62 mph)
- Itabashi – Akabane: 90 km/h (56 mph)
- All other sections: 95 km/h (59 mph)
The line runs parallel to the Yamanote Line between Ōsaki and Ikebukuro, where it is formally called the Yamanote Freight Line (山手貨物線?), and as an alternate route to the Tōhoku Main Line between Akabane and Ōmiya, where it is unofficially called the Tohoku Honsen Secondary Line (東北本線支線?). The portion between Ikebukuro and Akabane is officially known as the Akabane Line (赤羽線?). For most purposes, JR refers to all of these as part of the "Saikyō Line" when being used for Saikyō Line services.
There are three types of trains on the Saikyō Line: all-stations "Local" (各駅停車 Kakueki-Teisha?), "Rapid" (快速 kaisoku?), and "Commuter Rapid" (通勤快速 tsūkin kaisoku?). Between Akabane and Ōmiya, Rapid trains stop only at Toda-Kōen, Musashi-Urawa and Yonohommachi, while Commuter Rapid trains, which run during rush hours, stop only at Musashi-Urawa. Between Akabane and Ikebukuro, as well as on the Kawagoe and Rinkai lines, all trains stop at all stations. Between Ikebukuro and Osaki on the Yamanote Freight Line, all trains run limited-stop in both directions, with the Yamanote Line providing all-stations service.
- Local trains stop at all stations.
- Rapid and commuter rapid trains stop at stations marked "●" and pass those marked "｜".
- JR East 205 series 10-car EMUs (since 1989)
- JR East E233-7000 series 10-car EMUs (since 30 June 2013)
- TWR 70-000 series 10-car EMUs (since 1996)
The equipment used on the Saikyō Line consists of 10-car 205 series electric multiple unit (EMU) trains owned by JR East and based at Kawagoe Depot and 10-car TWR 70-000 series EMU trains owned by Tokyo Waterfront Area Rapid Transit and based at Yashio Depot.
The first of a fleet of 31 new 10-car E233-7000 series sets were introduced on Saikyō Line, Kawagoe Line, and Rinkai Line services between Kawagoe and Shin-Kiba from 30 June 2013, displacing the fleet of 205 series EMUs.
Before the establishment of the Saikyo Line, rolling stock used on the Akabane Line included:
- 72 series 8-car EMUs (1953–1967)
- 101 series 8-car EMUs (1967–1978)
- 103 series 8/10-car EMUs (1978–1985)
Akabane Line 103 series train in 1979
The Akabane line opened on 1 March 1885 as a segment of the Nippon Railway Shinagawa Line. The company was nationalized in 1906. Electric services on the line began in 1909. From 1972 to 1985, the line was the known as the Akabane Line after being a branch of Yamanote Line.
Before the Saikyō Line, there were several attempts to improve commuter rail service between Saitama and Tokyo. One of the earliest, the Tokyo-Ōmiya Electric Railway (東京大宮電気鉄道 Tōkyō-Ōmiya Denki Tetsudō?), was founded in 1928 but went bankrupt shortly thereafter due to rising land values in the area. Later, in 1968, the Tokyo Metropolitan Board of Transportation proposed to run the new Toei Mita Line to central Ōmiya.
Development of the Saikyō Line began as a Japanese National Railways effort to quell unrest in Saitama regarding the expansion of the Tōhoku and Jōetsu shinkansen. During the mid-1970s, local protesters staged sit-ins, demonstrations, and administrative actions to impede the building of the new high-speed lines north of Tokyo. JNR reached a settlement with the activists under which it would build a commuter line to serve these local communities, while being allowed to continue extending the Shinkansen.
The new line, tentatively called the "New Commuter Line" (通勤新線 Tsūkin Shinsen?), was built between Ōmiya and Akabane. Through service to Ikebukuro via the existing Akabane Line began on September 30, 1985. The Akabane Line name disappeared from daily use from this time. The Saikyo Line was initially troubled by inadequate train control systems which could not keep pace with its frequency of service; however, these issues were worked out during the first month of service.
When the Tōhoku Main Line portion of the Saikyō Line was being built, the stations from Kita-Akabane to Kita-Yono were designated with numbers from 1 to 10; Kita-Akabane Station was known as "New Commuter Line Station No. 1." However, even after names were assigned, passengers complained that each station looked just like the next due to their identical construction. As a result, JNR, in an unusual move, assigned colors to those stations so that they could be told apart from one another.
On 3 March 1986, the Saikyō Line began through service to Shinjuku via the Yamanote Freight Line, which had seen less use by freight services since the opening of the Musashino Line in 1973. Freight services on the former Akabane Line ended in 1999. Services southward to Shibuya and Ebisu did not begin until 16 March 1996, when new platforms were completed to accommodate passenger service. Through services to Ōsaki and the Rinkai Line began on 1 December 2002.
The Saikyō Line has had a particularly severe problem of overcrowding during peak periods, especially during weekday mornings. The opening of the Shōnan-Shinjuku Line in 2004 and the Tokyo Metro Fukutoshin Line in 2008, both of which parallel the Saikyō Line for part of its route, alleviated some of the worst crowding. Problems resulting from overcrowding have included a higher incidence of groping, as well as delays in train schedule caused by longer time taken at each station to pick up and drop off passengers. The Saikyō Line was notorious for having the highest reported number of groping-related incidents (known as chikan incidents) in the Greater Tokyo area. This problem was directly addressed by introducing women-only passenger cars during rush hours, and indirectly addressed by reducing overcrowding problems as a whole.
- JR Timetable, December 2008 issue
- 首都圏鉄道完全ガイド 主要JR路線編 [Tokyo Area Complete Railway Guide - Major JR Lines]. Japan: Futabasha. 6 December 2013. p. 75-86. ISBN 978-4-575-45414-7.
- JR電車編成表 2012冬 [JR EMU Formations - Winter 2012]. Japan: JRR. October 2011. p. 66. ISBN 978-4-330-25611-5.
- "秋田新幹線用車両と埼京線・横浜線用車両の新造について" [Akita Shinkansen, Saikyo Line, and Yokohama Line new train details] (PDF) (in Japanese). JR East. 10 April 2012. Retrieved 10 April 2012.
- "新型車両で快適に 埼京・川越線、３０日から導入" [Comfortable new trains to be introduced on Saikyo/Kawagoe Line from 30th] (in Japanese). Japan: The Saitama Shimbun. 7 June 2013. Retrieved 7 June 2013.
- "Worst for Chikan in Tokyo is Saikyo Line" Yomiuri Shimbun, 2005-02-08, retrieved 2006-06-19
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