For several years after the end of the Pacific War, the state of Japan, including that of the railways, was in utter turmoil, but after the start of the Korean War in 1950, the state recovery was in full scale, increasing demands for inter-city transportation rapidly.
太平洋戦争終結後数年間、鉄道をも含めて混乱の極みにあった日本も、1950年の朝鮮戦争以降本格的に復興し、鉄道の都市間輸送需要も急激に伸張していった。