South African Class 2E

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

South African Class 2E
Class 2E locomotive in MU operation with a Class 1E
Type and origin
Power typeElectric
DesignerSiemens-Schuckert
BuilderHenschel & Son
Serial number23132-23134
ModelSiemens 2E
Build date1937
Total produced3
Specifications
Configuration:
​
 • AARB-B
 • UICBo+Bo
 • CommonwealthBo+Bo
Gauge3 ft 6 in (1,067 mm) Cape gauge
Wheel diameter48 in (1,219 mm)
Wheelbase30 ft 11 in (9,423 mm)
 • Bogie9 ft 3 in (2,819 mm)
Pivot centres21 ft 8 in (6,604 mm)
Panto shoes26 ft 4 1⁄2 in (8,039 mm)
Length:
​
 • Over couplers43 ft 8 in (13,310 mm)
 • Over beams30 ft 8 in (9,347 mm)
Width9 ft 2.2 in (2,799 mm)
Height:
​
 • Pantograph13 ft (3,962 mm)
 • Body height11 ft 1 53⁄64 in (3,399 mm)
Axle load16 LT 15 cwt (17,020 kg)
 • Leading33 LT 10 cwt (34,040 kg)
 • Trailing33 LT 2 cwt (33,630 kg)
Adhesive weight66 LT 12 cwt (67,670 kg)
Loco weight66 LT 12 cwt (67,670 kg)
Electric system/s3 kV DC catenary
Current pickup(s)Pantographs
Traction motorsFour
 • Rating 1 hour402 hp (300 kW)
Gear ratio17:75
MU working3 maximum
Train brakesAir & Vacuum
CouplersAAR knuckle
Performance figures
Maximum speed45 mph (72 km/h)
Power output:
​
 • 1 hour1,608 hp (1,199 kW)
Tractive effort:
​
 • 1 hour21,200 lbf (94 kN)
Career
OperatorsSouth African Railways
ClassClass 2E
Number in class3
NumbersE134-E136
Delivered1937
First run1937
Withdrawn1973

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

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

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 units 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 was divided into a high voltage chamber and a low voltage 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 were 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 exciters, one for each motor, and the 110 V generator for the auxiliary equipment. The machines were flexibly coupled with a blower fan directly coupled at each end of the four-unit set, each fan 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

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 from left to right on the other side. When observing the locomotive from the side with the five grilles and two windows, the number 1 end of the locomotive would be to the left.[2][5]

Service

The Class 2E could be, and were, utilised in multiple working with Class 1E units, but this did not apply to regenerative working. During the 1940s steam traction still ruled the mainlines, but the use of electric locomotives through Johannesburg station and on general Reef hauler service became commonplace in an attempt to reduce the smoke nuisance in the central business district.[1][6]

They spent most of their years in service on the mainline between Transvaal and Natal. By 1946 they were mainly employed working between Pretoria and Johannesburg. They briefly served in the Western Cape near the end of their service lives. All three units were withdrawn from service in 1973.[1][3]

Illustration

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

  • A Class 2E unit with its left side and no. 1 end visible, Pretoria, c. 1947

References
  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. South African Railways Index and Diagrams Electric and Diesel Locomotives, 2'0" & 3'6" Gauge, c. 1940, as amended
  3. 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
  5. Soul of A Railway, System 6, Part 5: The New Main Line from Rossburgh to Pietermaritzburg compiled by Les Pivnic. Caption 94. (Accessed on 26 August 2017)
  6. Soul of A Railway, System 7, Western Transvaal, based in Johannesburg, Part 2. Johannesburg between the Home Signals, Part 2. Caption 9. (Accessed on 21 March 2017)
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