South African Class DS1

The South African Railways Class DS1 of 1939 was a diesel-electric locomotive.

South African Class DS1
No. D138, c. 1940
Type and origin
Power typeDiesel-electric
DesignerAllgemeine Elektricitäts-Gesellschaft
BuilderAllgemeine Elektricitäts-Gesellschaft
Serial numberAEG 5062/1939 (ESKOM locomotive)
ModelSAR DS1
Build date1939
Total produced2
Specifications
Configuration:
  AARC
  UICC
  CommonwealthCo
Gauge3 ft 6 in (1,067 mm) Cape gauge
Wheel diameter42 in (1,067 mm)
Wheelbase11 ft 4 in (3,454 mm)
Length:
  Over couplers30 ft 8 12 in (9,360 mm)
  Over beams27 ft 10 12 in (8,496 mm)
Height12 ft 6 34 in (3,829 mm)
Axle load14 LT 7 cwt (14,580 kg)
Loco weight40 LT 13 cwt (41.3 t)
Fuel typeDiesel
Fuel capacity289 imp gal (1,310 l)
Prime moverMAN 265 hp (198 kW)
GeneratorAEG 110 kW (150 hp) main
AEG 12 kW (16 hp) auxiliary
Traction motorsThree AEG
CylindersEight
Gear ratio5.67:1
CouplersAAR knuckle
Johnston link-and-pin (1956)
Performance figures
Power output265 hp (198 kW)
Tractive effort:
  Starting17,600 lbf (78 kN)
Factor of adh.5•15
Career
OperatorsSouth African Railways
ESKOM
ClassClass DS1
Number in class1 SAR, 1 ESKOM
NumbersD138, renumbered D514
Official nameCitelec (ESKOM)
Delivered1939
First run1939

The second diesel-electric locomotive on the South African Railways was a single Class DS1 AEG diesel-electric shunting locomotive which was placed in service in 1939. Two of these locomotives were delivered to South Africa, one for the Railways and another for the Electricity Supply Commission.[1][2]

Manufacturer

As a result of the problems experienced in obtaining adequate water supplies in the arid regions of South Africa and South West Africa, particularly on the section between De Aar in the Karoo via Upington to Keetmanshoop, the South African Railways (SAR) decided to experiment with diesel-powered traction and introduced its first two diesel-electric shunting locomotives in 1939.[1][2]

The second of these was a single six-wheeled locomotive of which two units were ordered from Allgemeine Elektricitäts-Gesellschaft (AEG) in Berlin at the same time as the single Class DS locomotive.[1][2]

Only one of them entered service on the SAR and was designated Class DS1. It was initially numbered D138, but it was soon renumbered to D514. Both numbers were actually in the electric locomotive number range.[1][2]

The second locomotive was delivered to the Electricity Supply Commission (ESCOM), the state-owned South African national power corporation, who placed it in service in Cape Town.[1][2]

Characteristics

The locomotive was powered by a Maschinenfabrik Augsburg-Nürnberg (MAN) 265 horsepower (198 kilowatts) eight-cylinder diesel engine prime mover. An AEG 110 kilowatts (150 horsepower) main generator and an AEG 12 kilowatts (16 horsepower) auxiliary generator were mounted directly in line between the engine and the cab. The engine was water-cooled with a fan that was belt-driven by the engine and that drew air through a conventional radiator.[1][3]

This three-axle locomotive was essentially half a Class DS locomotive. Each axle was driven by a force-ventitated axle-suspended DC traction motor and sanding was arranged at the back and front of all wheels. Its single engine compartment was identical to either one of the two engine compartments of the Class DS. The cab was also identical to that of the Class DS, equipped with mechanically interlocked dual controls to enable operation in either direction.[1][2][3]

Service

South African Railways

The SAR Class DS1 was withdrawn from yard service in July 1956 and transferred to the SAR's Civil Engineering department, who continued to use it for shunting at the Braamfontein Electric Running Shed (ERS) in Johannesburg into the early 1960s.[1] Since it was used to move trolleys with heavy traction motors around the workshop, the original AAR knuckle coupler was replaced by a low-mounted Johnston link-and-pin coupler and the original coupler pockets were blanked off.

No. D514 at Braamfontein Electric Running Shed

When it was finally retired from service and replaced by a Class S2 shunting steam locomotive, it was plinthed on a short piece of track on the western side of the Braamfontein ERS. The picture alongside shows the locomotive at Braamfontein, with the bell coupler mounted barely above track level and with the original coupler pocket blanked off.[4]

ESKOM

The ESKOM locomotive was initially employed by the City of Cape Town at the Table Bay Power Station. It was painted in a maroon livery and was named Citelek. It was later transferred to the Athlone Power Station in Cape Town, where it was scrapped in about 1966.[1]

References

  1. Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 136–137. ISBN 0869772112.
  2. Espitalier, T.J.; Day, W.A.J. (1947). The Locomotive in South Africa - A Brief History of Railway Development. Chapter VII - South African Railways (Continued). South African Railways and Harbours Magazine, March 1947. pp. 230-232.
  3. South African Railways and Harbours Locomotive Diagram Book, 2'0" & 3'6" Gauge Steam Locomotives, 15 August 1941, as amended
  4. SAR-L Group: Message #44237 by Les Smith on 29 November 2012
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