A E257-500 series EMU on a Sazanami service in October 2006
|Service type||Limited express|
|First service||15 July 1972|
|Current operator(s)||JR East|
|Distance travelled||128.9 km (80.1 mi)|
|Service frequency||4 return services daily|
|Line(s) used||Keiyo Line, Uchibo Line, Sobu Line|
|Catering facilities||Trolley service|
|Rolling stock||E257-500 series EMUs|
|Track gauge||1,067 mm (3 ft 6 in)|
|Electrification||1,500 V DC overhead|
|Operating speed||120 km/h (75 mph)|
Seasonal Shinjuku Sazanami services operate at certain weekends between Shinjuku and Tateyama.
- E257-500 series 5-car EMUs
Former rolling stock
- 15 July 1972 - Sazanami service starts coinciding with opening of the underground Sōbu Line platforms at Tokyo Station.
- 16 March 1991 - Sazanami service are rerouted via the Keiyo Line from Tokyo.
- 2 July 1993 - 255 series EMUs are introduced on View Sazanami services from Tokyo to Chikura.
- 16 October 2004 - E257-500 series EMUs are introduced.
- 10 December 2005 - The View Sazanami name is discontinued, and all services are made entirely no-smoking.
The opening of the Tokyo Bay Aqua-Line road across the Tokyo Bay in 1997 saw increased competition from long-distance bus services offering cheaper fares, resulting in decreasing ridership figures on the Sazanami services. From the start of the 15 March 2014 timetable revision, the number of services was reduced to six return workings daily.
- JR新幹線＆特急列車ファイル [JR Shinkansen & Limited Express Train File]. Japan: Kotsu Shimbun. 2008. p. 66. ISBN 978-4-330-00608-6.
- 日本と世界の鉄道カタログ'97~'98 [Japan and World Railway Catalogue 1997-1998] (in Japanese). Japan: Seibido Publishing. 17 August 1997. pp. 147, 157. ISBN 4-415-09254-3.
- ２００５年１２月ダイヤ改正について [Details of December 2005 Timetable Revision] (PDF) (Press release) (in Japanese). East Japan Railway Company. 30 September 2005. Retrieved 25 June 2012.
- 房総特急 引き潮 高速道充実で利用者減少 [Boso limited expresses ebbing: Passenger numbers falling due to improved expressway network]. Tokyo Shimbun Web (in Japanese). Japan: The Chunichi Shimbun. 25 March 2015. Archived from the original on 2014-03-26. Retrieved 26 March 2014.
|Wikimedia Commons has media related to Sazanami.|
- JR East 255 series Shiosai/Wakashio/Sazanami (in Japanese)
- JR East E257 series Wakashio/Sazanami/Shiosai/Ayame (in Japanese)