205系は南武線の主力です。直接新製投入された車両のほか、山手線や中央・総武緩行線から転用された車両もあります。一部の先頭車は、付随車にE231系に似た新しい運転台を取り付けて改造したものです。車体の色は銀色、黄色、オレンジ色、茶色です。
EMU Series 205 is the main force in Nambu Line. While some of them were directly delivered, the others were converted from Yamanote and Chuo-sobu local Line. Some of the front cars were connverted from trailers, by adding new cabin similar to E231. Color is silver, yellow, orange and brown.