Tōbu Tetsudō kabushiki gaisha is a Japanese commuter railway and keiretsu holding company in the Greater Tokyo Area as well as an intercity and regional operator in the Kantō region. Excluding the Japan Railways Group companies, Tobu's rail system is the second longest in Japan after Kintetsu Railway. It serves large portions of Saitama Prefecture, Gunma Prefecture and Tochigi Prefecture, as well as northern Tokyo and western Chiba Prefecture. The Tobu Railway Company is listed in the First Section of the Tokyo Stock Exchange and is a constituent of the Nikkei 225 index.
The Tobu corporate group is also engaged in road transportation (bus/taxi), real estate, and retail. It is the owner of the Tokyo Skytree, the third tallest tower in the world. The company is a member of the Fuyo Group keiretsu.
The name "Tobu" is formed from the kanji for 東 and 武蔵, the initial area served.
In 1924, Tobu began operating its first electric train on the Isesaki Line between Asakusa (later Narihirabashi, today Tokyo Skytree Station) and Nishiarai.
Tobu was the first railway in the Kanto region to adopt quadruple tracks, on the Kita-Senju to Takenotsuka sector in 1974. The Tobu Zoo opened in 1981.
The Tobu Main Line network has a tree topology starting at in Tokyo, with the Isesaki Line as the trunk, and the Tobu Kameido Line, Daishi Line, Tobu Urban Park Line, Tobu Sano Line, Koizumi Line, Tōbu Kiryū Line, and Nikkō Line forming the branches, with further branches into the Tobu Utsunomiya Line and Tobu Kinugawa Lines. It offers surcharged, seat-reserved limited express services from Tokyo to Nikkō and Kinugawa.
The Tojo Line runs northwest from in Tokyo to central and western Saitama Prefecture. A branch, the Ogose Line, runs to from .
Tobu's terminals in Tokyo are at (Main Line express services), (most other Main Line services) and (Tojo Line). The Skytree and Isesaki Lines interoperate with the Tokyo Metro Hibiya Line, Tokyo Metro Hanzomon Line and the Tokyu Den-en-toshi Line to serve central, southwestern Tokyo and Kanagawa Prefecture, while the Tojo Line interoperates with the Tokyo Metro Fukutoshin Line, Tokyo Metro Yurakucho Line, Tokyu Toyoko Line and Minatomirai Line to serve central and southwest Tokyo and Kanagawa Prefecture.
Eight new three-car 500 series EMU trains were introduced on limited express services on lines from Asakusa on 21 April 2017.
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