South African Class 10E1, Series 1

No. 10-071 at Pyramid South, Pretoria, 7 May 2013

Type and origin
Power type	Electric
Designer	General Electric Company
Builder	Union Carriage and Wagon
Serial number	5659-5708
Model	GEC 10E1
Build date	1987-1989
Total produced	50

Specifications
AAR wheel arr.	C-C
UIC class	Co'Co'
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Wheel diameter	1,220 mm (48.0 in)
Wheelbase	13,460 mm (44 ft 1.9 in)
• Bogie	4,060 mm (13 ft 3.8 in)
Pivot centres	10,200 mm (33 ft 5.6 in)
Panto shoes	12,000 mm (39 ft 4.4 in)
Length:
• Over couplers	18,520 mm (60 ft 9.1 in)
• Body	17,506 mm (57 ft 5.2 in)
Width	2,906 mm (9 ft 6.4 in)
Height:
• Pantograph	4,120 mm (13 ft 6.2 in)
• Body height	3,945 mm (12 ft 11.3 in)
Axle load	21,210 kg (46,760 lb)
Adhesive weight	126,000 kg (278,000 lb)
Loco weight	126,000 kg (278,000 lb)
Power supply	Catenary
Current collection	Pantographs
Traction motors	Six GEC G425AZ
• Rating 1 hour	540 kW (720 hp)
• Continuous	515 kW (691 hp)
Gear ratio	17:87
Loco brake	Air, Regenerative & Rheostatic
Train brakes	Air & Vacuum
Couplers	AAR knuckle

Performance figures
Maximum speed	90 km/h (56 mph)
Power output:
• 1 hour	3,240 kW (4,340 hp)
• Continuous	3,090 kW (4,140 hp)
Tractive effort:
• Starting	450 kN (100,000 lbf)
• 1 hour	335 kN (75,000 lbf)
• Continuous	310 kN (70,000 lbf) @ 35 km/h (22 mph)
Loco brakeforce	175 kN (39,000 lbf) @ 15–45 km/h (9–28 mph) 2,187 kN (492,000 lbf) @ 45–100 km/h (28–62 mph)

Career
Operators	South African Railways Spoornet Transnet Freight Rail
Class	Class 10E1
Power class	3 kV DC
Number in class	50
Numbers	10-051 to 10-100
Nicknames	Breadbin
Delivered	1987-1989
First run	1987

The South African Railways Class 10E1, Series 1 of 1987 is an electric locomotive.

Between 1987 and 1989, the South African Railways placed fifty Class 10E1, Series 1 electric locomotives with a Co-Co wheel arrangement in mainline service as a new standard heavy goods locomotive.^[1]

Manufacturer

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

Fifty locomotives were delivered by UCW between 1987 and 1989, numbered in the range from 10-051 to 10-100. 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-designed locomotive, UCW did not allocate builder’s numbers to previous locomotives it built for the SAR, but used the SAR unit numbers for their record keeping.^[1]^[4]

Characteristics

The Class 10E1 was introduced as a new standard 3 kV DC heavy goods locomotive. With a continuous power rating of 3,090 kilowatts (4,140 horsepower), four Class 10E1 locomotives are capable of performing the same work as six Class 6E1. The entire fleet of Class 10E1 electric locomotives features electronic chopper control, which is smoother in comparison to the rheostatic resistance control, which was used in the Classes 1E to 6E1 range of electric locomotives.^[2]^[5]

Brakes

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.^[2]^[6]

Bogies

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 off.^[2]

Orientation

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.^[1]

Service

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 1, numbers 10-062 to 10-100 were included in this leasing deal.^[4]

Works numbers

The Class 10E1, Series 1 GEC works numbers are listed in the table.^[4]

**Class 10E1, Series 1**
Loco no.	Works no.
10-051	5659
10-052	5660
10-053	5661
10-054	5662
10-055	5663
10-056	5664
10-057	5665
10-058	5666
10-059	5667
10-060	5668
10-061	5669
10-062	5670
10-063	5671
10-064	5672
10-065	5673
10-066	5674
10-067	5675
10-068	5676
10-069	5677
10-070	5678
10-071	5679
10-072	5680
10-073	5681
10-074	5682
10-075	5683
10-076	5684
10-077	5685
10-078	5686
10-079	5687
10-080	5688
10-081	5689
10-082	5690
10-083	5691
10-084	5692
10-085	5693
10-086	5694
10-087	5695
10-088	5696
10-089	5697
10-090	5698
10-091	5699
10-092	5700
10-093	5701
10-094	5702
10-095	5703
10-096	5704
10-097	5705
10-098	5706
10-099	5707
10-100	5708

Illustration

The main picture shows no. 10-071 in the Spoornet blue livery with outline numbers, at Pyramid South, north of Pretoria, on 7 May 2013. It shows the locomotive's right side, while the picture of no. 10-075 below shows the left side. Other liveries which were applied to the Class 10E1, Series 1 are also illustrated.

No. 10-075 in Spoornet blue livery with outline numbers, Sentrarand, Gauteng, 8 October 2009
No. 10-078, now inscribed E10078, in Transnet Freight Rail livery at Pyramid South, Pretoria, 14 May 2013

References

1 2 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
1 2 3 4 Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 132–133. ISBN 0869772112.
↑ "UCW - Electric locomotives" (PDF). The UCW Partnership. Archived from the original (PDF) on 12 October 2007. Retrieved 30 September 2010.
1 2 3 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.
↑ Jane's Train Recognition Guide
↑ Class 10E1 – Principle (sic) Dimensions and Technical Data (TFR leaflet used in driver training, circa 2010)

Wikimedia Commons has media related to South African Class 10E1 Series 1.

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Diesel

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