Rz was an electric locomotive built by ASEA to test out asynchronous motors. It was built in 1982 and closely related to the Rc-series. It was test run until 1989 on Siljansbanan but there was never any mass production of it. After ASEA merged with Brown Boveri & Cie to form Asea Brown Boveri in 1988 the development of asynchronous motors was moved to Switzerland.
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