However, this series of type 103 cars introduced to Keihanshin Local Line was found incapable of increasing acceleration power at the speed over sixty kilometers per hour, causing the cooling fans of motor to make a tremendous sound at speeds higher than seventy kilometers per hour, though this series of type 103 cars was certainly improved with regard to acceleration and deceleration capabilities within the range of lower speed if compared with series 51, 70, and 72.
ところが、京阪神緩行線に投入された103系は、低速域での加減速は確かに51、70、72系より改善されたものの、60km/h以上の加速は全く伸びない、70km/h以上になるとモーターの冷却ファンが凄まじい騒音をまき散らしていた。