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South African Class ES information


South African Class ES
Class ES shunting locomotive, c. 1936
Type and origin
♠ Series 1 & 2 – Series 3 & 4
Power typeElectric
DesignerSouth African Railways
(A.G. Watson)
BuilderSouth African Railways
Werkspoor
Serial numberWerkspoor 737-746, 913-924 & 1053-1054, SLM 3662
ModelSAR ES
Build date1936–1964
Total produced28
Specifications
Configuration:
 • AARB-B
 • UICBo+Bo
 • CommonwealthBo+Bo
Gauge3 ft 6 in (1,067 mm) Cape gauge
Wheel diameter1,219 mm (48.0 in)
Minimum curve91.45 m (300 ft)
Wheelbase9,423 mm (30 ft 11.0 in) ​
 • Bogie2,819 mm (9 ft 3.0 in)
Pivot centres6,604 mm (21 ft 8.0 in)
Length:
 • Over couplers13,310 mm (43 ft 8.0 in)
Width2,800 mm (9 ft 2.2 in)
Height:
 • Pantograph♠ 3,859 mm (12 ft 7.9 in)
4,026 mm (13 ft 2.5 in)
 • Body height♠ 3,478 mm (11 ft 4.9 in)
3,618 mm (11 ft 10.4 in)
Axle load17,018 kg (37,518 lb)
Loco weight68,075 kg (150,080 lb)
Electric system/s3 kV DC catenary
Current pickup(s)Pantograph
Traction motorsFour MV 182R ​
 • Rating 1 hour224 kW (300 hp)
Gear ratio17:75
Train brakesAir & Vacuum
CouplersAAR knuckle
Performance figures
Maximum speed40 km/h (25 mph)
Power output896 kW (1,202 hp)
Tractive effort:
 • Starting176 kN (40,000 lbf)
 • 1 hour94 kN (21,000 lbf)
 • Continuous73 kN (16,000 lbf)
Career
OperatorsSouth African Railways
Driefontein GM
ClassClass ES
Number in class28
NumbersSAR E500-E501 (ex E96-E97), E503-E512 (ex E124-E133), E515-E526, Driefontein 1-4
NicknamesStudebaker
Delivered1936–1964
First run1936
Withdrawnc. 1983

The South African Railways Class ES of 1936 was an electric locomotive.

In 1936, the South African Railways built two Class ES centre-cab electric shunting locomotives with a Bo+Bo wheel arrangement, based on the Class 1E mainline electric locomotive. Between then and 1964, more were acquired until a total of 24 Class ES locomotives were eventually in service. Four more were built new for industry in 1952 and 1957.[1][2][3][4]

The Class ES was the fourth locomotive type to be designed and built in South Africa, after the Natal Government Railways 4-6-2TT Havelock of 1888, the Class 2C of 1910 and the Class 20 of 1935.[2]

  1. ^ Espitalier, T.J.; Day, W.A.J. (1946). The Locomotive in South Africa – A Brief History of Railway Development. Chapter VII – South African Railways (Continued). South African Railways and Harbours Magazine, April 1946. p. 296.
  2. ^ a b Espitalier, T.J. (1947). Locomotives Designed and Built in South Africa – The S1, in service this month, is not the first locally-built engine. South African Railways and Harbours Magazine, October 1947. pp. 841-843.
  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. ^ 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, 63.

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