page_title: E231 series
section_title: E231-500 series
hierarchical_section_title: E231 series / E231-500 series
caption_attribution_description: 日本語: 山手線E231系500番台トウ537編成。　田端駅～駒込駅間にて
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: A fleet of 52 11-car E231-500 series was delivered from January 2002 to April 2005 for use on Yamanote Line services, replacing the earlier 205 series fleet. The first trains entered service on 21 April 2002. These trains include D-ATC digital automatic train control, and feature pairs of LCD passenger information screens above each door internally. These screens also show advertisements.
  Each 11-car set originally contained two six-door SaHa E230 trailer cars (cars 7 and 10) with six pairs of doors per side and bench seats that were folded up until 10 a.m. on weekdays to provide standing room only during the morning peak. From 22 February 2010, the seats were able to be used during the morning peak. The two six-door cars in each set were subsequently replaced by a new build of four-door trailer cars between February 2010 and August 2011, to standardize door spacing ahead of the introduction of platform doors on all Yamanote Line stations by 2017.
  The new SaHa E231-600 cars (new car 7) incorporated some elements from the newer E233 series (most notably seats and handrails). Meanwhile, the new SaHa E231-4600 cars (new car 10) were built almost fully to E233 series standards; they also have an irregular door spacing corresponding to the driving cars of Keihin-Tohoku Line E233-1000 series sets, which occasionally have to share the same platforms during engineering work. This results in interior seating arranged 3-7-7-5-4, instead of the normal 3-7-7-7-3 arrangement. The first batch of replacement four-door SaHa E231-600 and SaHa E231-4600 cars were delivered from JR East's Niitsu factory on 1 February 2010.
  In October 2014, former Yamanote Line set 520 was released from overhaul as a ten-car set, numbered A520, allocated to Mitaka Depot, and finished in the yellow Chūō–Sōbu Line livery. It entered revenue service on the Chūō–Sōbu Line from 1 December 2014. A second set, former Yamanote Line set 540 was converted to a ten-car set for use on the Chūō–Sōbu Line in May 2016, renumbered A540. Between 2017 and 2020, the remaining sets were transferred to the Chūō–Sōbu Line as the E235 series continues to replace them on the Yamanote Line. 48 of the 52 SaHa E231-4600 cars built from 2010 to 2011 were updated to E235 series standards (and re-numbered SaHa E235-4600), while the remaining 4 cars are stored in Tokyo General Rolling Stock Centre. The last set of E231-500 (Set 506) on the Yamanote Line finished service in January 2020 and was converted for service on the Chūō–Sōbu Line as set A506.
caption: A Yamanote Line 11-car set in June 2018
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