Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. R East was incorporated on April 1, 1987 after being spun off from the government-run Japanese National Railways. The spin-off was nominally "privatization", as the company was actually a wholly owned subsidiary of the government-owned JNR Settlement Corporation for several years, and was not completely sold to the public until 2002. Following the breakup, JR East ran the operations on former JNR lines in the Greater Tokyo Area, the Tohoku region, and surrounding areas.

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