South African Class 10E1, Series 2

The Spoornet Class 10E1, Series 2 of 1990 is a South African electric locomotive.

South African Class 10E1, Series 2
10-168 at Pyramid South, 22 September 2015
Type and origin
Power typeElectric
DesignerGeneral Electric Company
BuilderUnion Carriage & Wagon
Serial number5739-5788
ModelGEC 10E1
Build date1990-1993
Total produced50
Gauge3 ft 6 in (1,067 mm) Cape gauge
Wheel diameter1,220 mm (48.03 in)
Wheelbase13,460 mm (529 78 in)
  Bogie4,060 mm (13 ft 3 78 in)
Pivot centres10,200 mm (33 ft 5 58 in)
Panto shoes12,000 mm (39 ft 4 12 in)
  Over couplers18,520 mm (60 ft 9 18 in)
  Body17,506 mm (57 ft 5 14 in)
Width2,906 mm (9 ft 6 38 in)
  Pantograph4,120 mm (13 ft 6 14 in)
  Body height3,945 mm (12 ft 11 38 in)
Axle load21,210 kg (46,760 lb)
Adhesive weight126,000 kg (278,000 lb)
Loco weight126,000 kg (278,000 lb)
Electric system/s3 kV DC catenary
Current pickup(s)Pantographs
Traction motorsSix GEC G425AZ
  Rating 1 hour540 kW (720 hp)
  Continuous515 kW (691 hp)
Gear ratio17:87
Loco brakeAir, Regenerative & Rheostatic
Train brakesAir & Vacuum
CouplersAAR knuckle
Performance figures
Maximum speed90 km/h (56 mph)
Power output:
  1 hour3,240 kW (4,340 hp)
  Continuous3,090 kW (4,140 hp)
Tractive effort:
  Starting450 kN (100,000 lbf)
  1 hour335 kN (75,000 lbf)
  Continuous310 kN (70,000 lbf) @ 35 km/h (22 mph)
Brakeforce175 kN (39,000 lbf) @ 15–45 km/h (9–28 mph)
2,187 kN (492,000 lbf) @ 45–100 km/h (28–62 mph)
Transnet Freight Rail
ClassClass 10E1
Number in class50
Numbers10-126 to 10-175
First run1990

Between 1990 and 1992, Spoornet placed fiftyClass 10E1, Series 2 electric locomotives with a Co-Co wheel arrangement in mainline service.[1]


The 3 kV DC Class 10E1, Series 2 electric locomotive was designed for the South African Railways (SAR) by the General Electric Company (GEC) and built by Union Carriage & Wagon (UCW) in Nigel, Transvaal. GEC supplied the electrical equipment while UCW was responsible for the mechanical components and assembly.[1][2]

UCW delivered fifty locomotives to Spoornet between 1990 and 1992, numbered in the range from 10-126 to 10-175. Contrary to prior UCW practice, GEC works numbers were allocated to the Class 10E1 locomotives. With the exception of the Class 9E, also a UCW-built GEC locomotive, UCW did not allocate builder’s numbers to previous locomotives it built for the SAR or Spoornet, but used the SAR or Spoornet unit numbers for their record keeping.[1][3]


The Class 10E1 was introduced as a new standard 3 kV DC heavy goods locomotive. With a continuous power rating of 3,090 kilowatts (4,144 horsepower), four Class 10E1 units are capable of performing the same work as six Class 6E1 units.[4]


The entire Class 10E1 fleet features electronic chopper control, which is smoother in comparison to the rheostatic resistance control which was used in the Classes 1E to 6E1 electric locomotives.[5]

The locomotive makes use of either regenerative or rheostatic braking, as the situation demands. Both traction and electric braking power are continuously variable, with the electric braking optimised to such an extent that maximum use will be made of the regenerative braking capacity of the 3 kV DC network, with the ability to automatically change over to rheostatic braking whenever the overhead supply system becomes non-receptive.[4][6]


The Class 10E1 was built with sophisticated traction linkages on the bogies. Together with the locomotive's electronic wheel-slip detection system, these traction struts, mounted between the linkages on the bogies and the locomotive body and colloquially referred to as grasshopper legs, ensure the maximum transfer of power to the rails without causing wheel-slip by reducing the adhesion of the leading bogie and increasing that of the trailing bogie by as much as 15% upon starting.[4]


This dual cab locomotive has a roof access ladder on one side only, immediately to the right of the cab access door. The roof access ladder end is marked as the no. 2 end. In visual appearance, the Series 1 and Series 2 locomotives are virtually indistinguishable from each other.[3]


Most of the Class 10E1 locomotives were placed in service at Nelspruit and Ermelo in Mpumalanga. In 1998 a number of Spoornet’s electric locomotives and most of their Class 38-000 electro-diesel locomotives were sold to Maquarie-GETX (General Electric Financing) and leased back to Spoornet for a ten-year period which was to expire in 2008. Of the Class 10E, Series 2, numbers 10-136 to 10-173 were included in this leasing deal.[1]


The Class 10E2, Series 2 introduced the new Spoornet orange livery with a yellow and blue chevron pattern on the cowcatchers. In the late 1990s at least one was repainted in the Spoornet blue livery with outline numbers on the long hood sides. After 2008 in the Transnet Freight Rail (TFR) era, several received the TFR red, green and yellow livery.



  1. Middleton, John N. (2002). Railways of Southern Africa Locomotive Guide - 2002 (as amended by Combined Amendment List 4, January 2009) (2nd, Dec 2002 ed.). Herts, England: Beyer-Garratt Publications. pp. 50–52, 59–60.
  2. "UCW - Electric locomotives" (PDF). The UCW Partnership. Archived from the original (PDF) on 12 October 2007. Retrieved 30 September 2010.
  3. South African Railways Index and Diagrams Electric and Diesel Locomotives, 610mm and 1065mm Gauges, Ref LXD 14/1/100/20, 28 January 1975, as amended
  4. Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 132–133. ISBN 0869772112.
  5. Jane's Train Recognition Guide
  6. Class 10E1 – Principle (sic) Dimensions and Technical Data (TFR leaflet used in driver training, circa 2010)

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