The Seibu Railway Company, Ltd. (西武鉄道, Seibu Tetsudō Kabushiki Gaisha) is a major company in the Greater Tokyo area of Japan. Its principal business areas are railways, tourism and real estate. The present company formed as a result of the merger of the Musashino Railway with the former Seibu Railway. The Seibu Ikebukuro railway lines trace their origins to the Musashino Railway, and the Seibu Shinjuku lines to the former Seibu Railway.

Railway Operations

Seibu's routes total 179.8 km. They fall into two separate groups.

Ikebukuro Line Group

• Ikebukuro Line: Ikebukuro Station—Tokorozawa Station —Hanno Station —Agano Station (57.8 km)
• Seibu Chichibu Line: Agano Station—Seibu Chichibu Station (19.0 km)
• Seibu Yurakucho Line : Nerima Station —Kotake Mukaihara Station (2.6 km)
• Toshima Line : Nerima Station—Toshimaen Station (1.0 km)
• Sayama Line : Nishi Tokorozawa Station —Seibu Kyujo Station (4.2 km)

Shinjuku Line Group

• 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 —Sayama Station —Seibu Yuenchi Station (9.2 km)
• Kokubunji Line : Higashi Murayama Station —Ogawa Station —Kokubunji Station (7.8 km)
• Ahina Line : Minami Otsuka Station —Ahina Station (3.2 km: Freight line, not presently operating)
• Tamagawa Line: Musashi-Sakai Station —Koremasa Station (8.0 km)