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Descripción archivística![Pretoria. 3kV DC electrification, Rosslyn – De Wildt number 2 line, tests to measure contact wire...](/uploads/r/null/9/3/e/93ef5b792d47521629eea552f75d8343a1611955bff176d900f331c7385b6228/BF660_13_142.jpg)
Pretoria. 3kV DC electrification, Rosslyn – De Wildt number 2 line, tests to measure contact wire uplift. Six SAR Class 6E1's travelled in both directions with trailing pantographs at 50, 70 and 90 km/h on a test section between mast pole 33/9 and 33/10 with a temporary mast halfway between them All three mast poles were instrumented to measure contact wite uplift, technician setting up measuring equipment at mast pole 33/10. A linear potentiometer visible above the right hand of the technician measured contact wire uplift.