Following a timetable revision made in March 1991, where the interval of Rapid train services between Nishi-Akashi and Kakogawa during daytime hours was changed to fifteen minutes, the local train services to Kakogawa became limited to rush hours during the morning.
1991年3月のダイヤ改正では、昼間時の快速の西明石～加古川間15分ヘッド化に伴い、緩行の加古川乗り入れを朝ラッシュ時のみとした。