碓氷峠
A total of 25 Class EF63 locomotives were built between 1962 and 1976 exclusively for use as bankers (U.S. "helpers" or "pushers") on the steeply-graded Usui Pass section of the Shinetsu Main Line between and . They replaced the Class ED42 electric locomotives previously used on the rack-and-pinion line between these two stations.