South African Class 2E

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South African Class 2E
SAR Class 2E E13x.jpg
Class 2E locomotive in MU operation with a Class 1E
Type and origin
Power type Electric
Designer Siemens-Schuckert
Builder Henschel & Son
Serial number 23132-23134
Model Siemens 2E
Build date 1937
Total produced 3
Specifications
AAR wheel arr. B-B
UIC class Bo'Bo'
Gauge 3 ft 6 in (1,067 mm) Cape gauge
Wheel diameter 48 in (1,219 mm)
Wheelbase 30 ft 11 in (9,423 mm)
 • Bogie 9 ft 3 in (2,819 mm)
Pivot centres 21 ft 8 in (6,604 mm)
Panto shoes 26 ft 4 12 in (8,039 mm)
Length:
 • Over couplers 43 ft 8 in (13,310 mm)
 • Over beams 30 ft 8 in (9,347 mm)
Width 9 ft 2.2 in (2,799 mm)
Height:
 • Pantograph 13 ft (3,962 mm)
 • Body height 11 ft 1 5364 in (3,399 mm)
Axle load 16 LT 15 cwt (17,020 kg)
 • Leading 33 LT 10 cwt (34,040 kg)
 • Trailing 33 LT 2 cwt (33,630 kg)
Adhesive weight 66 LT 12 cwt (67,670 kg)
Loco weight 66 LT 12 cwt (67,670 kg)
Power supply Catenary
Current collection Pantographs
Traction motors Four
 • Rating 1 hour 402 hp (300 kW)
Gear ratio 17:75
MU working 3 maximum
Train brakes Air & Vacuum
Couplers AAR knuckle
Performance figures
Maximum speed 45 mph (72 km/h)
Power output:
 • 1 hour 1,608 hp (1,199 kW)
Tractive effort:
 • 1 hour 21,200 lbf (94 kN)
Career
Operators South African Railways
Class Class 2E
Power class 3 kV DC
Number in class 3
Numbers E134-E136
Delivered 1937
First run 1937
Retired 1973

The South African Railways Class 2E of 1937 was an electric locomotive.

In 1937, the South African Railways placed three German-built Class 2E 3 kV DC electric locomotives with a Bo+Bo wheel arrangement in mainline service.[1][2]

Manufacturer[edit]

South Africa's second mainline electric locomotive type, the Class 2E, entered service in Natal in 1937, intended for mixed traffic haulage. The electrical equipment was designed by Siemens-Schuckert of Berlin and the three locomotives were built for the South African Railways (SAR) by Henschel and Son in Germany. Numbered in the range from E134 to E136, they were the only German-built electric locomotives ever supplied to South Africa.[1][3][4]

Characteristics[edit]

The Class 2E was very similar in external appearance and dimensions to the Class 1E and used identical bogies. The most obvious distinction from the Class 1E was the difference in window and grille layout on the locomotive sides. The internal arrangement of their electrical components differed from those of the Class 1E and their four 402 horsepower (300 kilowatts) traction motors made them more powerful. Even so, probably as a result of the outbreak of the Second World War in 1939, only these three were ever acquired, after which the SAR reverted to the Class 1E, Series 5 to 7, for its subsequent acquisitions of similar electric locomotives.[1][3]

The body of the locomotive is divided into a high tension chamber and a low tension auxiliary machine and equipment compartment, with a side corridor along the right side of the locomotive when looking towards Cab 1. In the high tension chamber, 43 contactors are arranged along one side, with the motor-generator set in the middle of the chamber. The motor-generator was a four machine unit, comprising a high tension motor, two DC excitors, one for each motor, and the 110 V generator for the auxiliary equipment. The machines were flexibly coupled, with blower fans directly coupled at each end of the four-unit set, each supplying air to two of the main motors.[1]

The Class 2E had a Bo+Bo wheel arrangement with an articulated inter-bogie linkage. Like the Classes 1E, 3E and 4E, it had bogie-mounted draft gear, therefore no train forces were transmitted to the locomotive body.[2]

Orientation[edit]

These dual cab locomotives had three windows with a grille between each pair of windows on one side, and a line of five grilles and two windows on the other side. When observing the locomotive from the side with the five grilles, the number 1 end of the locomotive would be to the left.[2]

Service[edit]

The Class 2E could be, and were, utilised in multiple working with Class 1E units, but this did not apply to regenerative working. They spent most of their years in service on the mainline between Transvaal and Natal and, by 1946, were mainly employed working between Pretoria and Johannesburg. They briefly served in the Western Cape near the end of their service lives. They were withdrawn from service in 1973.[1][3]

Illustration[edit]

The main picture shows a Class 2E locomotive, with its right side and no. 2 end visible, coupled to a Class 1E locomotive.

References[edit]

  1. ^ a b c d e 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 c South African Railways Index and Diagrams Electric and Diesel Locomotives, 2'0" & 3'6" Gauge, c. 1940, as amended
  3. ^ a b c Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. p. 126. ISBN 0869772112. 
  4. ^ Henschel-Lieferliste (Henschel & Son works list), compiled by Dietmar Stresow