These replacements were urgently required especially by the Kansai Line which was compelled to scrap many 101-type cars due to damage caused by water-covered storage tracks within the enclosure of Oji Station when typhoon No.10 attacked that area in August of the previous year, though the Kansai line managed to operate other scrap-determined 101-type cars collected from other lines in metropolitan area.
中でも関西線の101系は、前年8月の台風10号による王寺駅構内電留線の冠水による101系の大量廃車により、首都圏からこれまた廃車予定車の101系をかき集めて運行していたことから、これらの置換えは緊急の課題となっていたものである。