The story
The first railway in Japan was operated by the imperial government in 1872. The idea of centralization of the railway was promoted under the idea of "breaking down of the geographical barriers that existed in the feudal communities which hindered the centralization of authority". Placing the railways under government control was for military and political ends; the government had no intention for the central railway to be operated as a "model enterprise". Early shareholders of the railway were members of the nobility, holding "the major portion of (the) capital". The governmental system was largely expanded by the promulgation of the Railway Nationalization Act in 1906. In 1920, the Ministry of Railways was established.
In 1949, JGR was reorganized to become a state-owned public corporation named the Japanese National Railways.
Timeline
June 12, 1872 - Provisional opening of Tokyo-Yokohama railway (Shinagawa Station - Yokohama Station)
October 14, 1872 - Formal opening of Tokyo-Yokohama railway (ceremony at Shimbashi and Yokohama Stations)
October 1, 1907 - Completion of nationalization of 17 private railways under 1906 Railway Nationalization Act
December 20, 1914 - Opening of Tokyo Station
November 1, 1925 - Inauguration of the Yamanote Loop Line
April 1, 1943 - Inclusion of Karafuto prefectural lines into national system
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February 1, 1946 - Official exclusion of Soviet-occupied Karafuto lines from national system
June 1, 1949 - Establishment of Japanese National Railways, i.e. end of Japanese Government Railways
April 1, 1987 - Privatization of JNR, establishment of seven JR companies
Historical operators of JGR
Before the establishment of the Japanese National Railways as a public corporation on June 1, 1949, the Japanese Government Railways were operated by the governmental agencies. The table below shows the historical operators of the JGR. Translated names of ministries may not be official. Names of the operating department generally mean "department (or office, section, agency) of railways" or like.
From Wikipedia’s article on Ministry of Railways (Japan), shared under CC BY-SA 4.0.3