The JNR class ED10 is one of the early electric locomotives adopted by ex-Japan National Railways (JNR) following the electrification of the narrow-gauge (3.5 ft.) Tōkaidō Main Line in 1925. The locomotive was designed and built by Westinghouse Electric (electrical components) and Baldwin (mechanical components) in 1928. The unit has a Bo-Bo wheel arrangement and is powered by four DC traction motors producing a total of 1,100 horsepower. The ED10 is a light little unit and weighs in at just over 67 tons and has a top speed of just 40 miles per hour. Only two ED10s were ever built.