An E257 series train on a Chuo Line Azusa service in January 2008
|Manufacturer||Hitachi, Kinki Sharyo, Tokyu Car Corporation|
|Number built||249 vehicles|
|Number in service||249 vehicles|
|Formation||2/5/9 cars per trainset|
|Line(s) served||Chuo Main Line, Uchibo Line, Sotobo Line|
|Car length||21,000 mm (68 ft 11 in) (end cars)|
20,500 mm (67 ft 3 in) (intermediate cars)
|Maximum speed||130 km/h (80 mph)|
|Electric system(s)||1,500 V DC overhead|
|Braking system(s)||Regenerative brake, electronically controlled pneumatic brakes, snow-resistant brake|
|Safety system(s)||ATS-SN, ATS-P|
|Track gauge||1,067 mm (3 ft 6 in)|
The E257 series (E257系) is a DC electric multiple unit (EMU) train type operated in Japan by East Japan Railway Company (JR East) and built jointly by Hitachi, Kinki Sharyo, and Tokyu Car Corporation.
- E257-0 series: Chuo Main Line
- E257-500 series: Boso Express
Two variants exist: the original E257-0 series for use on Chuo Main Line Azusa and Kaiji limited-express services, and the E257-500 series for use on Uchibo Line, Sotobo Line, Sobu Main Line, Narita Line, and Kashima Line limited-express services.
This sub-series version was introduced on 1 December 2001, to replace the aging 183 and 189 series rolling stock on Chuo Main Line Azusa and Kaiji services. Based at Matsumoto depot, the fleet consists of sixteen 9-car sets (M101 to M116) with a full cab at the Matsumoto end and a gangwayed cab at the Tokyo end, and five 2-car "add-on" sets (M201 to M205) with a full cab at the Tokyo end and a shunting cab only at the Matsumoto end.
The type was the recipient of the 45th Blue Ribbon Award (2002) of the Japan Railfan Club.
- Chūō Main Line
- Shinonoi Line
- Rapid: Matsumoto - Nagano
The nine-car sets (M101 to M116) are formed as follows.
|Numbering||KuHa E257-100||MoHa E257||MoHa E256||MoHa E257-1000||SaHa E257||SaRoHa E257||MoHa E257-100||MoHa E256-100||KuHa E256|
- Cars 4, 6, and 9 are each fitted with one PS37 single-arm pantograph.
The two-car sets (M201 to M205) are formed as follows.
|Numbering||KuHa E257||KuMoHa E257|
Car 2 is fitted with one PS37 single-arm pantograph.
The E257-500 sub-series version was delivered between July 2004 and October 2005, with the first sets entering service from 16 October 2004 on Uchibo Line Sazanami and Sotobo Line Wakashio limited-express services, replacing older 183 series rolling stock. Based at Makuhari depot in Chiba Prefecture, the fleet consists of 19 5-car sets (NB01 to NB19). Unlike the Chūō Line variant, these sets have gangways at both ends.
The five-car E257-500 series sets (NB01 to NB19) are formed as follows.
|Numbering||KuHa E256-500||MoHa E257-1500||MoHa E256-500||MoHa E257-500||KuHa E257-500|
Cars 2 and 4 are each fitted with one PS37 single-arm pantograph.
- Uchibo Line
- Sazanami: Tokyo - Tateyama
- Sotobo Line
- Wakashio: Tokyo - Katsuura - Awa-Kamogawa
- Sobu Main Line
- Yokosuka Line
- Ohayo Liner Zushi: Zushi - Tokyo
- Home Liner Zushi: Tokyo - Zushi
The E257-500 series sets are monoclass, with standard-class accommodation only.
- Jēāru zensharyō handobukku: Rail Magazine 2009 JR全車輌ハンドブック2009 [JR Rolling Stock Handbook 2009]. Japan: Neko Publishing. 2009. pp. 149–151. ISBN 978-4-7770-0836-0.
- 来年３月に現行車両「Ｅ３５１系」引退 スーパーあずさ、新型に [E351 series to be retired by next spring with new trains for "Super Azusa" services]. Sankei Photo (in Japanese). Japan: The Sankei Shimbun & Sankei Digital. 29 October 2017. Archived from the original on 22 November 2017. Retrieved 22 November 2017.
- JR電車編成表 2011夏 [JR EMU Formations - Summer 2011]. Japan: JRR. May 2010. ISBN 978-4-330-21211-1.
- E257系500代が〈さざなみ〉〈わかしお〉で運転開始 [E257-500 series enter service on "Sazanami" and "Wakashio"]. Railway Journal. 39 (459): 102. January 2005.
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