西武20000系を中心に掲載しています。
EMU Series 20000 has been in service since 2000. The series adopts Hitachi's A-Train design, with a double-skin aluminum body. It is not used on through services to the Yurakucho or Fukutoshin lines, since it does not have a front gangway door. Each trainset has 10 cars and is mainly used on express services on the Shinjuku and Ikebukuro lines.