In order to cope with the increase in running frequency and number of cars, cars of Kuha number 58 were introduced since there were extra Moha 42 cars and 43 (third-class cars' backs of the seats were upholstered at the time)
緩行の増発・増結は、モハ42・43に余裕があったことからクハ58を増備することで対応した（この頃には三等車の背ずりも布張り）。