South African Class 1A 4-8-0

The South African Railways Class 1A 4-8-0 of 1910 was a steam locomotive from the pre-Union era in the Colony of Natal.

NGR Class B 4-8-0 1910
South African Class 1A 4-8-0
SAR Class 1A no. 1301, ex NGR Class B no. 25,
Mason's Mill Loco, 6 July 1962
Type and origin
Power typeSteam
DesignerNatal Government Railways
(D.A. Hendrie)
BuilderNorth British Locomotive Company
Serial number19051-19071
ModelNGR Hendrie B
Build date1910
Total produced21
Specifications
Configuration:
  Whyte4-8-0 (Mastodon)
  UIC2'Dn2
Driver2nd coupled axle
Gauge3 ft 6 in (1,067 mm) Cape gauge
Leading dia.28 12 in (724 mm)
Coupled dia.46 in (1,168 mm)
Tender wheels30 in (762 mm)
Wheelbase50 ft 3 14 in (15,323 mm)
  Engine22 ft 6 in (6,858 mm)
  Leading6 ft (1,829 mm)
  Coupled12 ft 9 in (3,886 mm)
  Tender16 ft 6 in (5,029 mm)
  Tender bogie4 ft 6 in (1,372 mm)
Length:
  Over couplers57 ft 10 in (17,628 mm)
Height12 ft 7 14 in (3,842 mm)
Frame typePlate
Axle load14 LT 11 cwt (14,780 kg)
  Leading13 LT 12 cwt (13,820 kg)
  1st coupled14 LT 7 cwt (14,580 kg)
  2nd coupled14 LT 11 cwt (14,780 kg)
  3rd coupled13 LT 17 cwt (14,070 kg)
  4th coupled14 LT 6 cwt (14,530 kg)
  Tender bogieBogie 1: 20 LT 1 cwt (20,370 kg)
Bogie 2: 20 LT 10 cwt (20,830 kg)
  Tender axle10 LT 5 cwt (10,410 kg)
Adhesive weight57 LT 1 cwt (57,970 kg)
Loco weight70 LT 13 cwt (71,780 kg)
Tender weight40 LT 11 cwt (41,200 kg)
Total weight111 LT 4 cwt (113,000 kg)
Tender typeTJ (2-axle bogies)
TJ, TL, TM permitted
Fuel typeCoal
Fuel capacity6 LT (6.1 t)
Water cap3,500 imp gal (15,900 l)
Firebox typeBelpaire & combustion chamber
  Firegrate area34 sq ft (3.2 m2)
Boiler:
  Pitch7 ft 4 14 in (2,242 mm)
  Diameter5 ft 4 12 in (1,638 mm)
  Tube plates12 ft 1 in (3,683 mm)
  Small tubes325: 2 in (51 mm)
Boiler pressure190 psi (1,310 kPa)
Safety valveRamsbottom
Heating surface2,188 sq ft (203.3 m2)
  Tubes2,056 sq ft (191.0 m2)
  Firebox132 sq ft (12.3 m2)
CylindersTwo
Cylinder size20 12 in (521 mm) bore
24 in (610 mm) stroke
Valve gearWalschaerts
Valve typeMurdoch's D slide
Piston on no. 33
CouplersJohnston link-and-pin
AAR knuckle (1930s)
Performance figures
Tractive effort31,240 lbf (139.0 kN) @ 75%
Career
OperatorsNatal Government Railways
South African Railways
ClassNGR Class B
SAR Class 1A
Number in class21
NumbersNGR 13-33
SAR 1289-1309
Delivered1910
First run1910
Withdrawn1974
The leading coupled axle had flangeless wheels

In 1910, the Natal Government Railways placed 21 improved Class B 4-8-0 Mastodon type tender locomotives in service. In 1912, when these locomotives were assimilated into the South African Railways, they were renumbered and designated Class 1A.[1][2][3][4]

Manufacturer

D.A. Hendrie

By 1909, more locomotives were required for goods operation on the lower sections of the Natal mainline and a further 21 locomotives of the Class B 4-8-0 Mastodon design were ordered by the Natal Government Railways (NGR). They were delivered and placed in service in 1910, built by the North British Locomotive Company with Type TJ tenders and numbered in the range from 13 to 33. These locomotives were also officially designated Class B and, since they incorporated various improvements on the locomotives of 1904, they became commonly known as the Class Improved Hendrie B.[2][4][5][6]

Characteristics

Like their predecessors, they had Belpaire fireboxes with combustion chambers and Walschaerts valve gear. While they were practically identical to the 1904 locomotives in most respects, their boilers had been raised by 1 14 inches (32 millimetres), which raised the boiler pitch by 1 inch (25 millimetres) to 7 feet 4 14 inches (2,242 millimetres) and gave a better rake on the sides of the ash pan.[2]

With one exception, they used Murdoch's D slide valves like the 1904 locomotives. The last locomotive, no. 33, was an experimental locomotive equipped with piston valves.[1][2]

Hendrie's steam reverser

Hendrie's steam reverser

They were built with Hendrie’s steam reversers. The Hendrie steam reversing gear consisted of a 5 12 inches (140 millimetres) diameter steam cylinder and a 5 inches (127 millimetres) diameter oil cylinder, arranged in line on a bracket which was fixed to the main engine frame on the driver's side. The cylinders had a common piston rod which had a slot in the centre, between the cylinders. This slot accommodated a sliding crosshead which engaged with an arm fixed to the reversing shaft.[2]

By means of a small lever, the driver could admit steam to either end of the steam cylinder, which would open a cataract valve arranged on top of the oil cylinder to allow oil to flow from either end of the oil cylinder to the other. A pointer in the cab would indicate the exact position of the reversing gear and, when the desired position was reached, bringing the hand lever to the central position would close the cataract valve and fix the gear in the forward or reverse position.[2]

South African Railways

When the Union of South Africa was established on 31 May 1910, the three Colonial government railways (Cape Government Railways, NGR and Central South African Railways) were united under a single administration to control and administer the railways, ports and harbours of the Union. Although the South African Railways and Harbours came into existence in 1910, the actual classification and renumbering of all the rolling stock of the three constituent railways were only implemented with effect from 1 January 1912.[3][7]

In 1912, these locomotives were renumbered in the range from 1289 to 1309 and designated Class 1A on the South African Railways (SAR).[1][3][4]

Service

When new, they were used to haul fast passenger and goods trains between Durban and Pietermaritzburg. In SAR service, they were also used on mainline workings out of Port Elizabeth. In later years they were relegated to shunting, particularly working in Natal but also in Cape Town, Port Elizabeth, East London and in Transvaal. None of them was reboilered with a Watson Standard boiler with a round-topped firebox.[4][8]

In their last years, few Class 1 and Class 1A locomotives were still at work. As at April 1973, for example, there were still three working at Mason’s Mill in Pietermaritzburg and one in the Eastern Transvaal, two of them Class 1A. The last Class 1A locomotive was retired by the SAR in November 1974.[8]

In industrial service, no. 1301 survived longer and was still in service as Apex Mines no. 3 at Greenside in 1984. In 2019, 1301 was donated by Apex Mines to UK based North British Locomotive Preservation Group. It is planned to restore the locomotive at the Wonderboom Transport Museum, Pretoria before repatriating it to the UK.[9][10]

Works numbers and renumbering

Their works numbers, numbering and SAR renumbering are listed in the table.[1][3][5][11]

Preservation

Of the Class 1A ,one survived into preservation.

NumberWorks #OwnerCurrent Location
130119063North British Locomotive Preservation GroupGreenside Colliery

Illustration

The main picture shows a Class 1A locomotive with a modified Type TJ tender, while the following picture shows one with a Type TL tender which was rebuilt from a Type TJ tender c. 1930.[6]

References

  1. Holland, D.F. (1971). Steam Locomotives of the South African Railways. 1: 1859–1910 (1st ed.). Newton Abbott, Devon: David & Charles. pp. 99–101. ISBN 978-0-7153-5382-0.
  2. Espitalier, T.J.; Day, W.A.J. (1944). The Locomotive in South Africa - A Brief History of Railway Development. Chapter III - Natal Government Railways (Continued). South African Railways and Harbours Magazine, July 1944. p. 505.
  3. Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer’s Office, Pretoria, January 1912, pp. 7, 12, 15, 44 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000)
  4. Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 34–35. ISBN 0869772112.
  5. North British Locomotive Company works list, compiled by Austrian locomotive historian Bernhard Schmeiser
  6. South African Railways and Harbours Locomotive Diagram Book, 2’0" & 3’6" Gauge Steam Locomotives, 15 August 1941, as amended
  7. The South African Railways - Historical Survey. Editor George Hart, Publisher Bill Hart, Sponsored by Dorbyl Ltd., Published c. 1978, p. 25.
  8. Durrant, A. E. (1989). Twilight of South African Steam (1st ed.). Newton Abbott, London: David & Charles. p. 54. ISBN 0715386387.
  9. NBL Group Aims to Repartiate Scottish-Designed 4-8-0 Steam Railway issue 499 November 2019 page 8
  10. North British Group save Hendrie-designed loco in South Africa The Railway Magazine issue 1424 November 2019 page 96
  11. Holland, D. F. (1972). Steam Locomotives of the South African Railways. 2: 1910-1955 (1st ed.). Newton Abbott, Devon: David & Charles. p. 137. ISBN 978-0-7153-5427-8.

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