March 10, 1975: The Sanyo Shinkansen Line was extended to Hakata Station and the JNR timetable was revised accordingly; this was accompanied by the change of the high-class train operation as follows:
1975年（昭和50年）3月10日、山陽新幹線博多駅乗り入れに伴う国鉄ダイヤ改正に伴い、以下のように変更する。