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. It and its holding company hold shares of numerous bus, hotel and tourism operations nationwide. History "Seibu Railway" was originally the name of a tram service between Shinjuku and Ogikubo, which was transferred to the Tokyo metropolitan government in 1951 and eventually closed in 1962. The Seibu Railway was acquired in 1921 by the Kawagoe Railway, which had operated a train service between Kokubunji and Kawagoe since 1894; the merged company kept the "Seibu" name and expanded its main line to Takadanobaba, forming what is now known as the Seibu Shinjuku Line. The current Seibu Railway is a product of a 1945 merger between the former Seibu Railway and the Musashino Railway, which was founded in 1912 to operate what is now known as the Seibu Ikebukuro Line. The merger was largely orchestrated by Yasujirō Tsutsumi, a real estate developer who opened the Tamako Railway (now the Seibu Tamako Line) in 1928, became a major shareholder in the Musashino Railway and merged the two in 1940. In 1944, the Tokyo metropolitan government, under the administration of Shigeo Ōdachi, hired the Seibu Railway and the Musashino Railway to provide a coordinated service to transport night soil from central Tokyo to outlying disposal areas. At the time, night soil was generally transported by truck to Tokyo Bay and disposed of by dumping there, but the progress of World War II led to gasoline and personnel shortages which made this system unsustainable. The sewage service continued through the American occupation until 1951. As a result of this service cooperation, Seibu Railway merged with Musashino Railway to form the current Seibu Railway, effective in September 1945. Tokyu Group president Keita Goto had an intense personal rivalry with Tsutsumi, and unsuccessfully attempted to block both Tsutsumi's takeover of the Musashino Railway and its merger with the Seibu Railway. The former Seibu network based around Shinjuku and the former Musashino network based around Ikebukuro remain operationally separated today. In 1986, Seibu Railway moved its headquarters from the Ikebukuro area to Tokorozawa, Saitama, where the two main Seibu lines intersect. Tsutsumi became the controlling shareholder in Seibu Railway following the merger