Japanese). Vol. I. Tokyo: JTB Corporation. pp. 63–64. ISBN 4-533-02980-9. ja:不要不急線 lists the lines. Gordon, Andrew (2019). A Modern History of Japan (4th ed...

railway was designated as a nonessential and nonurgent line (Japanese: 不要不急線). After World War II it was proposed that the railway be rebuilt and operated...