page_title: E231 series
section_title: E231-900 series
hierarchical_section_title: E231 series / E231-900 series
caption_attribution_description: 日本語: JR東日本E231系900番台ケヨMU1編成(武蔵野線仕様) 京葉線新習志野駅撮影
context_page_description: The E231 series is an electric multiple unit train type used for commuter and outer-suburban services operated by East Japan Railway Company in Japan since 2000.
context_section_description: This was the prototype E231 series set, built jointly by Tokyu Car and JR East's Niitsu factory, and delivered in October 1998 for the Chūō–Sōbu Line, classified as 209-950 series. It was reclassified as E231-900 series in June 2000.
  On 25 February 2020, it operated its last revenue service on the Chūō–Sōbu Line. The set was refurbished at Ōmiya Rolling Stock Center between 3 March and 10 July for transfer to the Musashino Line and associated through services and reentered service on 20 July.
caption: Musashino Line E231-900 series in July 2020
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