Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Between 1974 and 1975 the South African Railways (SAR), later renamed Spoornet and then Transnet Freight Rail (TFR), placed 100 Class 6E1, Series 5 locomotives in service. During the late 1970s one of these, E1600, was withdrawn from revenue service for use as an experimental 25kV AC locomotive and reclassified to Class Exp/AC. South African Class 6E1 Series 5 3kV DC electric locomotives were built by Union Carriage and Wagon (UCW) in Nigel, Transvaal. UCW did not allocate builder's numbers to the locomotives it built for the South African Railways. While the practice by most other locomotive builders was to allocate builder's numbers or works numbers to record the locomotives built by them, UCW simply used the SAR road numbers for their record keeping.

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