This way, JNR managed to overcome difficult situations during the summer season until it completed the renovation in September, but JNR still operated the trains under tentative timetables until the end of February of the following year in order to reserve an extra Tc equipped with an air-conditioning system.
このようにして、四苦八苦しながら夏季を乗り切り、9月には新性能化を完了したが、Tc冷房改造の予備車捻出のため、翌年2月末まで暫定運用を組んで対応した。