RjB 9 and 10

RjB 9 and RjB 10 were two identical electric locomotives operated by Norsk Transport on Rjukanbanen in Norway. Built by Swiss Sécheron and German [Arnold Arnold Jung Lokomotivfabrik|Jung Lokomotivfabrik|Jung] in 1958, they served until the closing of the line in 1991.
The locomotives were equipped with four 183 kW motors, giving 732 kW in total. They could operate at 55 km/h, and were built for both 10 kV and 15 kV electrical systems; the former was used on Rjukanbanen until the older RjB 1–8 were retired in 1966, and the power changed to the standard of Norges Statsbaner.
A b/w photograph of unit # 9 heading a freight working en route appeared in "Locomotives made in Germany", 1966 ed., pg.15 bottom; issued by "Exportfoerderungsverband der deutschen Lokomotivindustrie", DE-Frankfurt/Main 1966, softcover, quadrilingual. Rating given at 830 kW by the caption; factor 1,13 reflects the ratio between a 1-hourly rating and a continuous rating for series-wound, directly-fed, single-phase ac electric motors. Unfortunately, no further detail was issued. Mechanical design reflects that of the shorter, yet heavier dual-power Bo'Bo' 600 V DC o/h-fed electric / diesel-electric locomotives supplied by Jung to the "E&H" docklands and smelting works railways of Duisburg-Hamborn at the same time.