South West African Class Hb

DSWA Class Hb 0-6-2T
South West African Class Hb 0-6-2T

No. 61 with optional coal and water tender, c. 1930
Type and origin
Power type Steam
Designer Henschel and Son
Builder Henschel and Son
Serial number 7298-7300, 7623-7626, 7740-7745, 8610-8611
Model Class Hb
Build date 1905-1908
Total produced 15
Specifications
Configuration 0-6-2 (Branchliner)
Driver 3rd coupled axle
Gauge 600 mm (1 ft 11 58 in) narrow
Coupled dia. 33 78 in (860 mm)
Wheelbase 13 ft 3 12 in (4,051 mm)
  Coupled 6 ft 4 34 in (1,949 mm)
Wheel spacing
(Asymmetrical)
1-2: 3 ft 4 12 in (1,029 mm)
2-3: 3 ft 58 in (930 mm)
Length:
  Over couplers 25 ft (7,620 mm)
  Over beams 22 ft 6 34 in (6,877 mm)
Width 7 ft 2 12 in (2,197 mm)
Height 10 ft 6 in (3,200 mm)
Adhesive weight 17 LT 14 cwt (17,980 kg)
Loco weight 22 LT 5 cwt (22,610 kg)
Tender type 2-axle bogies
Fuel type Coal
Fuel capacity 15 long hundredweight (0.8 t)
Water cap 220 imp gal (1,000 l)
Firebox type Round-top
  Firegrate area 11.2 sq ft (1.04 m2)
Boiler:
  Pitch 4 ft 7 12 in (1,410 mm)
Boiler pressure 171 psi (1,179 kPa)
Cylinders Two
Cylinder size 320 mm (12.6 in) bore
450 mm (17.7 in) stroke
Valve gear Allan
Couplers Buffers and chain
Performance figures
Tractive effort 10,263 lbf (45.65 kN) @ 75%
Career
Operators Otavi Mining and Railway Company
South African Railways
Class Class Hb
Number in class 15
Numbers 51-65
Delivered 1905-1908
First run 1905
Withdrawn 1942

The South West African Class Hb 0-6-2T of 1905 was a narrow gauge steam locomotive from the Deutsch-Südwest-Afrika era.

Between 1905 and 1908, the German Administration in Deutsch-Südwest-Afrika acquired fifteen Class Hb tank locomotives with a 0-6-2 wheel arrangement, for lease to the Otavi Mining and Railway Company. Six of these locomotives survived to be taken onto the roster of the South African Railways after the First World War.[1][2][3]

Manufacturer

By 1905, the rapid progress with the construction of the Otavi Railway called for heavier and more powerful locomotives. Between 1905 and 1908, fifteen 600 millimetres (23.6 inches) narrow gauge 0-6-2 tank and tank-and-tender steam locomotives were built for the German Administration in Deutsch-Südwest-Afrika (DSWA) by Henschel and Son in Germany. They were designated Class Hb and numbered in the range from 51 to 65.[1][3][4]

The locomotives were leased to the Otavi Mining and Railway Company, who operated the narrow gauge Otavi Railway which was being constructed across the Namib Desert between Swakopmund and Tsumeb, to augment their mainline locomotive fleet.[1][3]

Characteristics

The locomotives used Allan valve gear and were equipped with dust covers to protect the motion from wind-blown sand in the Namib Desert. The "Hb" classification identified the locomotive type as the second class to have been built for DSWA by Henschel. They were delivered in four batches.[1][4]

South African Railways

During the First World War, the former German Colony came under South African administration and the railways in DSWA came under control of the Union Defence Forces. Control of all railway operations in South West Africa (SWA) was passed on from the Military to the Director of Railways in Windhoek on 1 August 1915. On 1 April 1922, all the railway lines and rolling stock in the territory became part of the South African Railways (SAR).[1][3]

No. 56 without side tanks, c. 1930

Six of these locomotives, numbers 51, 54, 56, 61, 62 and 65, survived into the SAR era. They retained their German Colonial Hb classification and engine numbers while in SAR service. They were withdrawn from service in 1942 and all but one were scrapped.[1][2][3]

Photographic evidence, such as that of no. 56 alongside, suggests that at some stage, probably in the SAR era, the surviving locomotives were made into tender engines by removing their side tanks. This particular locomotive has been preserved, coupled to a short period train at the Alte Feste museum in Windhoek.[2]

References

  1. 1 2 3 4 5 6 Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. p. 116. ISBN 0869772112.
  2. 1 2 3 Dulez, Jean A. (2012). Railways of Southern Africa 150 Years (Commemorating One Hundred and Fifty Years of Railways on the Sub-Continent - Complete Motive Power Classifications and Famous Trains - 1860-2011) (1st ed.). Garden View, Johannesburg, South Africa: Vidrail Productions. pp. 235, 387. ISBN 9 780620 512282.
  3. 1 2 3 4 5 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, October 1947. p. 859.
  4. 1 2 3 4 5 6 Henschel-Lieferliste (Henschel & Son works list), compiled by Dietmar Stresow
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