The E231 series, actively operating on the Joban Line, debuted in 2002 as a replacement for the 103 series. The fleet consists of 10-car and 5-car formations and operates as the longest 15-car formation among E231 series commuter trains. The train body features a blue-green stripe, aligned with its line color, and an additional uguisu color stripe to prevent boarding mistakes with the local line. Alongside the E531 series for medium-distance trains, the E231 series serves on the Joban Rapid Line between Ueno and Toride, as well as the Narita Line from Abiko to Narita. After the Ueno-Tokyo Line inauguration in 2015, its operations expanded to include access to Shinagawa.
- Model of the 110/123 formation from the Matsudo Vehicle Center
- Reproduction of the updated underfloor equipment of MOHAE230/MOHAE231 (some specifications differ due to the use of existing parts)
- Roof-mounted coolers: Cars 1, 2, 6-10, 13, and 15 equipped with AU725A, while cars 3-5, 11, 12, and 14 feature AU725B
- Front cars equipped with head/tail lights, and front destination displays illuminate (using warm white LED). Cars 10, 11, and 15 come with a light-off switch
- The front coupling of the first car has a dummy coupler, while cars 10, 11, and 15 utilize the KATO coupler tight connection type (without hook) with electrical connectors
- Intermediate couplings adopt body-mounted KATO coupler tight connection type (with hook)
- Slotless motor ensures smooth and quiet operation
- Printed wheelchair, stroller marks, and weak air-conditioning car indications
- The basic set and 5-car set store a full 15-car formation in the bookcase
- Compatible with interior lighting kit Kato 11-211 (11-212)
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