South African Class 8E

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South African Class 8E
SAR Class 8E E8002.JPG
No. E8002 at Mandini Station, KwaZulu-Natal,
13 August 2007
Type and origin
Power type Electric
Designer BBC-Siemens
Builder Union Carriage and Wagon
Serial number Industrials 449143-449149
Model BBC-Siemens 8E
Build date 1983-1985
Total produced 107
Specifications
Configuration:
 • AAR B-B
 • UIC Bo'Bo'
Gauge 3 ft 6 in (1,067 mm) Cape gauge
Wheel diameter 1,220 mm (48.0 in)
Wheelbase 11,130 mm (36 ft 6.2 in)
 • Bogie 3,280 mm (10 ft 9.1 in)
Pivot centres 7,850 mm (25 ft 9.1 in)
Length:
 • Over couplers 16,120 mm (52 ft 10.6 in)
 • Body 15,260 mm (50 ft 0.8 in)
Width 3,040 mm (9 ft 11.7 in)
Height:
 • Pantograph 4,140 mm (13 ft 7.0 in)
 • Body height 3,680 mm (12 ft 0.9 in)
Axle load 21,171 kg (46,674 lb)
(E8001-E8018)
20,960 kg (46,210 lb)
(E8019-E8100)
Adhesive weight 82,000 kg (181,000 lb)
(E8001-E8018)
81,200 kg (179,000 lb)
(E8019-E8100)
Loco weight 82,000 kg (181,000 lb)
(E8001-E8018)
81,200 kg (179,000 lb)
(E8019-E8100)
Power supply Catenary
Current source Pantograph
Traction motors Four IKB2820-OTA-02
 • Rating 1 hour 200 kW (270 hp)
 • Continuous 176 kW (236 hp)
Gear ratio 17:115
Loco brake Air
Train brakes Air & Vacuum
Couplers AAR knuckle
Performance figures
Maximum speed 75 km/h (47 mph)
Power output:
 • 1 hour 800 kW (1,100 hp)
 • Continuous 704 kW (944 hp)
Tractive effort:
 • Starting 287.6 kN (64,700 lbf)
 • 1 hour 177.3 kN (39,900 lbf)
 • Continuous 145.3 kN (32,700 lbf) @ 17 km/h (11 mph)
Career
Operators South African Railways
Spoornet
Transnet Freight Rail
Driefontein Gold Mine
Impala Platinum
Class Class 8E
Power class 3 kV DC
Number in class 107
Numbers SAR E8001-E8100
Dries 5-7
Implats 11-12, 14-15
Nicknames Cockroach
Delivered 1983-1985
First run 1983

The South African Railways Class 8E of 1983 is an electric locomotive.

Between 1983 and 1985, the South African Railways placed one hundred Class 8E centre-cab electric locomotives with a Bo-Bo wheel arrangement in shunting service. Seven more were built for the mining industry.[1][2]

Manufacturer[edit]

As a result of the gradual withdrawal of steam locomotives from service, many of which had been employed as shunting engines, and in addition to the Classes 36-000 and 36-200 diesel-electric locomotives, a growing need arose for a modern electric shunting locomotive for the South African Railways (SAR), especially for use in yards in the large 3 kV DC electrified centres, where the Class ES and Class 1ES locomotives were also due to be withdrawn.[3]

Plate BBC 8E (E8032).JPG

The Class 8E electric shunting locomo­tive was designed for the SAR by a consortium consisting of Brown Boveri of Switzerland and Siemens of Germany. It was built by Union Carriage and Wagon (UCW) in Nigel, Transvaal, who also fabricated the mechanical components.[2][4]

One hundred locomotives were delivered by UCW between 1983 and 1985, numbered in the range from E8001 to E8100. Another seven locomotives were built by UCW for the mining industry. UCW did not allocate builder’s numbers to the locomotives it built for the SAR, but used the SAR unit numbers for their record keeping. The locomotives which were built by UCW for industry, on the other hand, were allocated works numbers.[1][2]

Orientation and features[edit]

No. 1 end
No. 2 end

The centre cab Class 8E has large grilles on the sides of both hoods on one side, and a grille on the side of only the left hand hood, when viewed from the other side. The no. 1 end will be at the viewer's left when observing the locomotive from the side with grilles on both hoods.[1]

The pictures alongside, of no. E8008 with both hood covers removed, illustrate the different equipment installed inside the two ends of the locomotive.

The locomotive has solid state electrical control circuitry, with a thyristor controlled chopper supply­ing the four traction motors. Since the conventional accelerating resistors which are used on mainline electric locomotives, could be omitted, considerable energy saving was accomplished on heavy shunting duties.[3]

The bogies are based on those of the Class 6E, but with a rubber secondary suspension system, which provides maximum adhesive force to the locomotive when starting from rest. The locomotive was designed to be operated by a crew of one and has two driving stations in the cab.[3]

Service[edit]

Class 8E E8066 IDR.JPG

The Class 8E was initially placed in service on the Witwatersrand, but a large number of them were later allocated to Durban and to other locations in Natal. Some are also employed at Beaconsfield in Kimberley, at Postmasburg in the Northern Cape and at Nelspruit in Mpumalanga. Apart from a short period in the early 1980s, when one served as the station pilot in Cape Town, working between the mainline platforms at Cape Town station and the passenger carriage yard at Culemborg, the Class 8E is unknown in the Western Cape.[3]

They are powerful shunters and popular with their drivers, even though problems are sometimes experienced with start-up or failures, while working at coastal centres such as at Umbilo in Durban. This is attributed to the damp climate, which causes start-up contacter failures. Beginning in 2007, they were gradually equipped with air conditioning units, similar to those installed in the Class 18E, for added crew comfort. The air conditioning unit is mounted on the running board to the right of the cab on the right side of the locomotive.[1]

Industrial use[edit]

At the same time that the Class 8E locomotives were being built for the SAR, another seven were built for the mining industry.

  • Three were built for Driefontein Consolidated Gold Mine (Dries) near Carletonville, numbered in the range from 5 to 7 and with builder’s works numbers in the range from 449145 to 449147. Of these, Dries no. 5 was withdrawn and scrapped after an accident, with the remains dumped at the mine.
  • Four were built for the Impala Platinum mine (Implats) at Phokeng near Rustenburg, numbered 11, 12, 14 and 15, with builder’s works numbers 449143, 449144, 449148 and 449149. In addition to these, seven SAR Class 8E locomotives, numbers E8005, E8006, E8019, E8026, E8042, E8050 and E8060, were later sold to Implats.[2]

Illustration[edit]

The main picture shows numbers E8002 and E8007 at Mandini Station on 13 August 2007. Liveries which were applied to Class 8E locomotives are illustrated below.

References[edit]

  1. ^ a b c d 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
  2. ^ a b c d 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. 51, 59, 63. 
  3. ^ a b c d Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. p. 131. ISBN 0869772112. 
  4. ^ "UCW - Electric locomotives" (PDF). The UCW Partnership. Archived from the original (PDF) on 12 October 2007. Retrieved 30 September 2010.