South African Class A 4-8-2T
SAR Class A Belpaire no. 196, ex NGR no 133, at Masons Mill, Pietermaritzburg, 10 December 2010 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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The leading coupled axle had flangeless wheels |
The South African Railways Class A 4-8-2T of 1888 was a steam locomotive from the pre-Union era in the Natal Colony.
In 1888, the Natal Government Railways placed the first five of its eventual one hundred Class D 4-8-2T tank steam locomotives in service. The last was delivered in 1899. They were the first locomotives in the world to be built with a 4-8-2 wheel arrangement, later to become known as the Mountain type. In 1912, when these locomotives were assimilated into the South African Railways, they were renumbered and designated Class A. In 1915, another two Class A locomotives were built from spare parts.[1][2]
Manufacturers
The Natal Government Railways (NGR) Class D 4-8-2T tank locomotive was designed by William Milne, the Locomotive Superintendent of the NGR from 1877 to 1896, and was built by Dübs and Company. The first 42 locomotives, with an operating boiler pressure of 140 pounds per square inch (965 kilopascals) and numbered in the range from 49 to 90, were placed in service during Milne's term. They proved to be such good engines that, when G.W. Reid took over as Locomotive Superintendent in 1896, he continued to place further orders for another 58, numbered in the range from 91 to 148, but with the boiler pressure increased to 160 pounds per square inch (1,103 kilopascals). These 100 locomotives, initially known on the NGR as the Dübs A, were delivered in ten batches by Dübs between 1888 and 1899.[1][3][4]
As far as is known, the Dübs A locomotives were the first in the world to be designed and built with a 4-8-2 wheel arrangement, later to become known as the Mountain type.[1]
Modifications
The performance in service of the Dübs A was gradually improved by various modifications. New boilers were fitted as and when the originals needed replacement, with a working pressure of 160 pounds per square inch (1,103 kilopascals) instead of the as-delivered 140 pounds per square inch (965 kilopascals) of the first few batches. This increased their tractive effort at 75% boiler pressure from 16,340 pounds-force (72.7 kilonewtons) to 18,670 pounds-force (83.0 kilonewtons). The coal bunkers were also enlarged and the connecting rod big-ends were changed to the marine type, to increase ground clearance.[1][3]
Beginning in 1905, after D.A. Hendrie took over from Reid as Locomotive Superintendent, these locomotives were gradually fitted with Belpaire fireboxes with wider firegrates. The flat-topped Belpaire firebox had the advantage of an increased area of the water-line at the hottest part of the boiler, together with increased steam space over the firebox. In order to accomplish this, Hendrie raised the boiler's pitch by 4 1⁄2 inches (114 millimetres) and cut away the frame under the firebox to accommodate the wider grates. The wider firebox required that the water tanks also had to be moved out and the opportunity was taken to enlarge the tanks. The cabs were also improved, to offer the engine crew better protection, and new brass-capped chimneys replaced the original straight flared chimneys. These modified locomotives were known as the Improved Dübs A.[1][3]
When a locomotive classification system was introduced on the NGR, the Dübs A locomotive family was designated Class D. The unmodified locomotives became the Class D1, while the modified locomotives with Belpaire fireboxes became the Class D2.[1][5][6]
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 required careful planning and was only implemented with effect from 1 January 1912.[7][8]
In 1912, these engines were designated Class A and were renumbered in the range from 97 to 196, with the unmodified Class D1 locomotives receiving the numbers in the range from 97 to 186 and the ten, at the time, already reboilered Class D2 locomotives receiving the numbers in the range from 187 to 196. In South African Railways (SAR) service, the Improved Dübs A locomotives became known as the Class A Belpaire.[7][9]
In 1915, to help counter wartime motive power shortages, brought about by the diminished ability to order new locomotives from European builders because of the hostilities, another two Class A locomotives were built from spare parts by the SAR in their Durban shops. These two locomotives were numbered 332 and 333.[9]
Service
In the NGR era, the Class D fleet remained in service on the Natal mainline, until they were eventually displaced by more modern locomotives. They continued to serve on the Dundee-Hlobane branchline, the Harrismith-Ladysmith section and on the north coast line to Empangeni well into the SAR era. The last of the Class A was withdrawn from service in 1962.[9]
Several locomotives continued to serve in industrial use for many years. A few survive in preservation.[1]
- Ex NGR no. 84, SAR no. 130 named "Patrys", is plinthed at the Reefsteamers Depot in Germiston.[10]
- Ex NGR no. 90, SAR no. 136 named "Umbilo", is in the care of the Umgeni Steam Railway.[11]
- Ex NGR no. 55, SAR no. 103, was moved from Witbank to the Outeniqua Transport Museum in George in August 2014.
- Ex NGR no 133, SAR Class A Belpaire no. 196, is plinthed at Masons Mill in Pietermaritzburg.
Rebuilding to Class 17 4-8-0TT
When a shortage of suitable shunting locomotives developed in 1926, the SAR modified 21 Class A and Class A Belpaire 4-8-2T locomotives by removing the trailing bissel bogie and coal bunker, shortening the main frame and adding a tender to increase their coal and water capacity.[3][9]
Tenders from various scrapped locomotive types were used, probable tender models being three-axle Type YB, YC (as in the picture alongside), YE and YE1 tenders, as well as the Type XC1 four-axle tender, as depicted in the official SAR locomotive diagram.[2]
These 21 rebuilt locomotives became the SAR Class 17 4-8-0 tank-and-tender locomotives, numbered in the range from 1415 to 1435. They were used as shunting locomotives around Durban and Port Elizabeth, until they were withdrawn from service by 1961.[3][9]
Works numbers
The builder's works numbers, years built, NGR and SAR numbers, firebox type and Class 17 numbers are listed in the table.
Builder |
Works No. |
Year |
NGR No. |
SAR No. |
Model |
Class 17 No. |
---|---|---|---|---|---|---|
Dübs | 2446 | 1888 | 49 | 97 | Dübs A | |
Dübs | 2447 | 1888 | 50 | 98 | Dübs A | |
Dübs | 2448 | 1888 | 51 | 99 | Dübs A | |
Dübs | 2449 | 1888 | 52 | 100 | Dübs A | |
Dübs | 2450 | 1888 | 53 | 101 | Dübs A | |
Dübs | 2451 | 1888 | 54 | 102 | Dübs A | |
Dübs | 2499 | 1889 | 55 | 103 | Dübs A | |
Dübs | 2500 | 1889 | 56 | 104 | Dübs A | |
Dübs | 2501 | 1889 | 57 | 105 | Dübs A | |
Dübs | 2502 | 1889 | 58 | 106 | Dübs A | |
Dübs | 2503 | 1889 | 59 | 107 | Dübs A | |
Dübs | 2504 | 1889 | 60 | 108 | Dübs A | |
Dübs | 2604 | 1890 | 61 | 109 | Dübs A | 1421 |
Dübs | 2605 | 1890 | 62 | 110 | Dübs A | |
Dübs | 2606 | 1890 | 63 | 111 | Dübs A | |
Dübs | 2607 | 1890 | 64 | 112 | Dübs A | |
Dübs | 2608 | 1890 | 65 | 113 | Dübs A | |
Dübs | 2609 | 1890 | 66 | 114 | Dübs A | |
Dübs | 2610 | 1890 | 67 | 115 | Dübs A | |
Dübs | 2611 | 1890 | 68 | 116 | Dübs A | 1417 |
Dübs | 2612 | 1890 | 69 | 117 | Dübs A | 1427 |
Dübs | 2613 | 1890 | 70 | 118 | Dübs A | 1428 |
Dübs | 2614 | 1890 | 71 | 119 | Dübs A | 1425 |
Dübs | 2615 | 1890 | 72 | 192 | Belpaire | |
Dübs | 2616 | 1890 | 73 | 120 | Dübs A | |
Dübs | 2617 | 1890 | 74 | 121 | Dübs A | |
Dübs | 2618 | 1890 | 75 | 122 | Dübs A | 1420 |
Dübs | 2619 | 1890 | 76 | 123 | Dübs A | |
Dübs | 2620 | 1890 | 77 | 124 | Dübs A | |
Dübs | 2621 | 1890 | 78 | 125 | Dübs A | |
Dübs | 2622 | 1890 | 79 | 126 | Dübs A | |
Dübs | 2623 | 1890 | 80 | 193 | Belpaire | 1423 |
Dübs | 2624 | 1890 | 81 | 127 | Dübs A | |
Dübs | 2625 | 1890 | 82 | 128 | Dübs A | 1419 |
Dübs | 2626 | 1890 | 83 | 129 | Dübs A | 1433 |
Dübs | 2627 | 1890 | 84 | 130 | Dübs A | |
Dübs | 2628 | 1890 | 85 | 131 | Dübs A | |
Dübs | 2965 | 1892 | 86 | 132 | Dübs A | |
Dübs | 2966 | 1892 | 87 | 133 | Dübs A | |
Dübs | 2967 | 1892 | 88 | 134 | Dübs A | |
Dübs | 3317 | 1895 | 89 | 135 | Dübs A | 1422 |
Dübs | 3318 | 1895 | 90 | 136 | Dübs A | 1426 |
Dübs | 3319 | 1895 | 91 | 137 | Dübs A | |
Dübs | 3320 | 1895 | 92 | 138 | Dübs A | |
Dübs | 3321 | 1895 | 93 | 139 | Dübs A | |
Dübs | 3322 | 1895 | 94 | 140 | Dübs A | |
Dübs | 3363 | 1896 | 95 | 141 | Dübs A | |
Dübs | 3364 | 1896 | 96 | 142 | Dübs A | |
Dübs | 3365 | 1896 | 97 | 143 | Dübs A | |
Dübs | 3366 | 1896 | 98 | 144 | Dübs A | |
Dübs | 3367 | 1896 | 99 | 145 | Dübs A | |
Dübs | 3368 | 1896 | 100 | 146 | Dübs A | |
Dübs | 3477 | 1897 | 101 | 147 | Dübs A | 1434 |
Dübs | 3478 | 1897 | 102 | 148 | Dübs A | |
Dübs | 3479 | 1897 | 103 | 149 | Dübs A | |
Dübs | 3480 | 1897 | 104 | 150 | Dübs A | |
Dübs | 3481 | 1897 | 105 | 151 | Dübs A | 1431 |
Dübs | 3482 | 1897 | 106 | 152 | Dübs A | |
Dübs | 3483 | 1897 | 107 | 153 | Dübs A | |
Dübs | 3484 | 1897 | 108 | 154 | Dübs A | 1416 |
Dübs | 3485 | 1897 | 109 | 194 | Belpaire | |
Dübs | 3486 | 1897 | 110 | 155 | Dübs A | |
Dübs | 3604 | 1898 | 111 | 156 | Dübs A | |
Dübs | 3605 | 1898 | 112 | 157 | Dübs A | 1432 |
Dübs | 3556 | 1898 | 113 | 158 | Dübs A | 1415 |
Dübs | 3557 | 1898 | 114 | 187 | Belpaire | |
Dübs | 3558 | 1898 | 115 | 159 | Dübs A | |
Dübs | 3559 | 1898 | 116 | 160 | Dübs A | |
Dübs | 3560 | 1898 | 117 | 161 | Dübs A | |
Dübs | 3561 | 1898 | 118 | 165 | Dübs A | |
Dübs | 3562 | 1898 | 119 | 162 | Dübs A | |
Dübs | 3563 | 1898 | 120 | 166 | Dübs A | 1424 |
Dübs | 3564 | 1898 | 121 | 163 | Dübs A | 1435 |
Dübs | 3565 | 1898 | 122 | 164 | Dübs A | |
Dübs | 3566 | 1898 | 123 | 188 | Belpaire | |
Dübs | 3567 | 1898 | 124 | 195 | Belpaire | |
Dübs | 3811 | 1899 | 125 | 167 | Dübs A | |
Dübs | 3812 | 1899 | 126 | 168 | Dübs A | |
Dübs | 3813 | 1899 | 127 | 169 | Dübs A | |
Dübs | 3814 | 1899 | 128 | 170 | Dübs A | |
Dübs | 3815 | 1899 | 129 | 171 | Dübs A | |
Dübs | 3816 | 1899 | 130 | 172 | Dübs A | |
Dübs | 3817 | 1899 | 131 | 173 | Dübs A | |
Dübs | 3818 | 1899 | 132 | 189 | Belpaire | |
Dübs | 3819 | 1899 | 133 | 196 | Belpaire | |
Dübs | 3820 | 1899 | 134 | 190 | Belpaire | 1418 |
Dübs | 3821 | 1899 | 135 | 174 | Dübs A | |
Dübs | 3822 | 1899 | 136 | 175 | Dübs A | |
Dübs | 3823 | 1899 | 137 | 176 | Dübs A | |
Dübs | 3824 | 1899 | 138 | 177 | Dübs A | |
Dübs | 3825 | 1899 | 139 | 178 | Dübs A | |
Dübs | 3826 | 1899 | 140 | 179 | Dübs A | |
Dübs | 3827 | 1899 | 141 | 191 | Belpaire | 1430 |
Dübs | 3828 | 1899 | 142 | 180 | Dübs A | |
Dübs | 3829 | 1899 | 143 | 181 | Dübs A | 1429 |
Dübs | 3830 | 1899 | 144 | 182 | Dübs A | |
Dübs | 3831 | 1899 | 145 | 183 | Dübs A | |
Dübs | 3832 | 1899 | 146 | 184 | Dübs A | |
Dübs | 3833 | 1899 | 147 | 185 | Dübs A | |
Dübs | 3834 | 1899 | 148 | 186 | Dübs A | |
SAR | 1915 | 332 | Belpaire | |||
SAR | 1915 | 333 | Belpaire | |||
Illustration
The main picture shows SAR Class A Belpaire no. 196 at Masons Mill, Pietermaritzburg, on 10 December 2010. The following pictures illustrate some of the post delivery changes which were made, such as the altered cab for better crew protection.
-
NGR Class D1 no. 105, as built, c. 1900, SAR Class A no. 151
-
NGR Class D1 no. 72, as built, c. 1900, SAR Class A Belpaire no. 192
-
NGR Class D1 no. 84, SAR Class A no. 130, Reefsteamers, 17 May 2009
References
- 1 2 3 4 5 6 7 Holland, D.F. (1971). Steam Locomotives of the South African Railways, Volume 1: 1859-1910 (1st ed.). Newton Abbott, Devon: David & Charles. pp. 90–93. ISBN 978-0-7153-5382-0.
- 1 2 South African Railways and Harbours Locomotive Diagram Book, 2'0" & 3'6" Gauge Steam Locomotives, 15 August 1941, as amended
- 1 2 3 4 5 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, June 1944. pp. 422-423.
- ↑ Pattison, R.G. (1997). The Cape Seventh Class Locomotives (1st ed.). Kenilworth, Cape Town: The Railway History Group. p. 6. ISBN 0958400946.
- ↑ Durrant, A E (1989). Twilight of South African Steam (1st ed.). Newton Abbott, London: David & Charles. p. 15. ISBN 0715386387.
- ↑ The Railway Report for year ending 31 Dec. 1908, Natal Government Railways, p. 39, par 14.
- 1 2 Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer's Office, Pretoria, January 1912, pp. 7, 13, 20-22 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000)
- ↑ The South African Railways - Historical Survey. Editor George Hart, Publisher Bill Hart, Sponsored by Dorbyl Ltd., Published c. 1978, p. 25.
- 1 2 3 4 5 Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 10–11, 26–27, 68. ISBN 0869772112.
- ↑ Germiston, Reefsteamers Germiston Depot, "PATRYS" SAR Class A No 130
- ↑ Class Dübs "A" "Umbilo"
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