Seibu railway

Seibu Railway Company, Ltd. (西武鉄道株式会社, Seibu Tetsudō Kabushiki-gaisha) is a conglomerate based in Tokorozawa, Saitama, Japan, with principal business areas in railways, tourism, and real estate. Seibu Railway's operations are concentrated in northwest Tokyo and Saitama Prefecture; the name "Seibu" is an abbreviation of "west Musashi", referring to the historic name for this area. However it and its holding company hold shares of numerous bus, hotel and tourism operations nationwide.

kebukuro Line Group
The Ikebukuro Line group includes the Ikebukuro Line and its branches.
 * Ikebukuro Line: Ikebukuro Station—Tokorozawa Station—Hannō Station—Agano Station (57.8 km)
 * offers direct "through-service" via the Seibu Yūrakuchō Line to: Shin-Kiba Station on the Tokyo Metro Yūrakuchō Line and Motomachi-Chūkagai Station on the Minatomirai Line via the Tōkyū Tōyoko Line and the Tokyo Metro Fukutoshin Line.[7]
 * Seibu Chichibu Line: Agano Station—Seibu Chichibu Station (19.0 km)
 * Seibu Yūrakuchō Line: Nerima Station—Kotake Mukaihara Station (2.6 km)
 * connects the Ikebukuro Line and the Tokyo Metro system
 * Toshima Line: Nerima Station—Toshimaen Station (1.0 km)
 * Sayama Line: Nishi-Tokorozawa Station—Seibu-Kyūjō-mae Station (4.2 km)

Shinjuku Line Group
The Shinjuku Line group includes the Shinjuku Line and its branches, as well as the Tamagawa Line, which is not a branch of the Shinjuku Line but had been owned by the Shinjuku Line's operator before its merger with the Ikebukuro Line operator. Until May 31, 2017, this list included the Ahina Line (安比奈線). Prior to the formal closure, the 3.2 km freight line between Minami-Ōtsuka Station and Ahina Station had suspended operation since 1963.
 * Shinjuku Line: Seibu Shinjuku Station–Tokorozawa Station–Hon-Kawagoe Station (47.5 km)
 * Seibu-en Line: Higashi-Murayama Station—Seibu-en Station (2.4 km)
 * Haijima Line: Kodaira Station—Haijima Station (14.3 km)
 * Tamako Line: Kokubunji Station—Hagiyama Station—Seibu Yuenchi Station (9.2 km)
 * Kokubunji Line: Higashi-Murayama Station—Ogawa Station—Kokubunji Station (7.8 km)
 * Tamagawa Line: Musashi-Sakai Station—Koremasa Station (8.0 km)