December 16, 1989: With the timetable revision, the number of limited express trains during the daytime on weekdays was reduced by extending the interval from 15 to 20 minutes, while the number of express and local trains was increased by reducing the interval to 10 minutes.
1989年（平成元年）12月16日ダイヤ改正により、平日昼間の特急を15分間隔から20分間隔に減便、急行・普通を10分間隔に増発。