In the section from Shin-Shimonoseki Station to Kokura Station (located in Fukuoka Prefecture) and to Hakata Station, the company operating the Shinkansen line and that operating the regular line are different, JR West and JR Kyushu, respectively, and therefore, the section is handled differently from other sections.
また山陽新幹線の新下関駅-小倉駅(福岡県)-博多駅間については、新幹線（JR西日本）と在来線（JR九州）とで管理する会社が異なることから、他の区間とは扱いが異なっている。