203系を中心に掲載しています。
Series 203 is a derivative of Series 201 for the Joban Line. It has an aluminum silver body, a front gangway door, and a chopper control system. The interior is the same as that of Series 201. The trains run between Toride on the Joban Line and Yoyogi-uehara on the Tokyo Metro Chiyoda Line. They are being replaced by Series E233-2000 and are expected to be withdrawn within a few years.