The E233 series (E233系) is a commuter and suburban electric multiple unit (EMU) train type developed by East Japan Railway Company from the earlier E231 series and the E531 series design. The first train was introduced in December 2006 for use on the Chūō Line (Rapid), followed by the E233-1000 series variant in 2007 for use on the Keihin–Tōhoku and Negishi lines, the E233-3000 series outer-suburban variant in December 2007 for use on the Tōkaidō Main Line, and narrow-bodied E233-2000 series variant for Jōban Line and Tokyo Metro Chiyoda Line through services. Further variants were built for use on the Keiyō Line, Yokohama Line, Saikyō Line, and Nambu Line.
A line-up of six different E233 series variants in October 2015 (left to right: Nambu Line E233-8000, Saikyo Line E233-7000, Yokohama Line E233-6000, Keiyō Line E233-5000, Tōkaidō,Takasaki,Utsunomiya Line E233-3000, Chūō Line E233-0 series)
Chūō Line 10-car set T4 in November 2022
Keihin–Tōhoku Line E233-1000 series set 113 in March 2021
Jōban Line/Tokyo Metro Chiyoda Line E233-2000 series set 10 in April 2019
The E231 series is an electric multiple unit (EMU) train type used for commuter and outer-suburban services operated by East Japan Railway Company in Japan since 2000.
A Chūō–Sōbu Line E231-0 series train in December 2022
A Jōban Line 10+5 car set in March 2021
Chūō–Sōbu Line 10-car E231-500 series set A545 in March 2021
An E231-800 series set in July 2022
