South African Class 7B 4-8-0

The South African Railways Class 7B 4-8-0 of 1900 was a steam locomotive from the pre-Union era in Transvaal.

In 1900, the Imperial Military Railways placed 25 Cape 7th Class 4-8-0 Mastodon type steam locomotives in service. In that same year, three Cape 7th Class locomotives which had been ordered by the Pretoria-Pietersburg Railway were also placed in service. All these locomotives were taken onto the Central South African Railways roster at the end of the Second Boer War in 1902. In 1906, three of these locomotives were sold to the Natal Government Railways.^[1][2][3]

In 1912, 26 of these 28 locomotives were assimilated into the South African Railways. They were followed in 1913 by the remaining two, which had been leased to Paulings as construction locomotives. All but one of these locomotives were renumbered and reclassified to Class 7B. In 1915, one more Cape 7th Class locomotive was obtained from the Rhodesia Railways and erroneously also designated Class 7B.^[1][2][3][4]

Background

After the outbreak of the Second Boer War in 1899, control of all railways in the Cape of Good Hope and the Colony of Natal remained in the hands of their civil staff, but now working in co-operation with the invading British military. As possession was gradually obtained of the lines of the Orange Free State and the Zuid-Afrikaansche Republiek, the Oranje-Vrijstaat Gouvernement-Spoorwegen (OVGS) and the Nederlandsche-Zuid-Afrikaansche Spoorweg-Maatschappij (NZASM) were combined into the Imperial Military Railways (IMR). The military railway was in the hands of military and civilian staff who were appointed by the Director of Railways for the South African Field Forces, Lieutenant Colonel E.P.C. Girouard KCMG DSO RE.^[1]

Manufacturer

Because of the damage caused during hostilities and the transportation demands of the British armed forces, a shortage of locomotives developed. In 1900, the IMR placed an order with Neilson, Reid and Company for 25 Cape 7th Class locomotives which were numbered in the range from 106 to 130 upon delivery.^[1][5]

Also in 1900, three Cape 7th Class locomotives which had been ordered before the war by the Pretoria-Pietersburg Railway (PPR), were intercepted by the IMR and placed in service. These engines had also been built by Neilson, Reid. Numbered PPR 7 to 9, these were the last locomotives to have been ordered by the PPR before it ceased to exist upon its incorporation into the NZASM, which itself was subsequently incorporated into the IMR.^[1]

H.M. Beatty

One more locomotive in the group which was eventually to become the South African Railways (SAR) Class 7B was part of a batch of Cape 7th Class locomotives which had been built for the Rhodesia Railways (RR) by Neilson, Reid in 1899 and placed in service in Rhodesia in 1900.^[1]

The original Cape 7th Class had been designed in 1892 by H.M. Beatty, Cape Government Railways (Western System) Locomotive Superintendent. All these locomotives were built to the same design as the 1896 to 1898 batch of 7th Class engines of the Cape Government Railways (CGR) with their increased heating capacity and type ZC bogie-wheeled tenders, which were later to be designated Class 7A on the SAR.^[1]

Transfers and renumberings

After the cessation of hostilities on 1 June 1902, the IMR was transferred to civil control on 1 July 1902 and renamed the Central South African Railways (CSAR). The IMR and PPR 7th Class locomotives were renumbered by the CSAR in the ranges from 373 to 397 and 398 to 400 respectively.^[1]

Natal Government Railways

In 1906, three of these locomotives, CSAR numbers 384, 389 and 393, were sold to the Natal Government Railways (NGR), who used them to work on the Harrismith-Bethlehem section in the Orange River Colony (ORC) on the mainline from Ladysmith to Bloemfontein. They were designated the NGR Class L and renumbered in the range from 327 to 329.^[1][6]

SAR classification

When the Union of South Africa was established on 31 May 1910, the three Colonial government railways (CGR, NGR and CSAR) 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.^[4][7]

When all of these locomotives, with three exceptions, were assimilated into the SAR in 1912, they were renumbered in the ranges from 1032 to 1034, 1036 to 1039 and 1041 to 1058, all designated Class 7B.^[1][2][4]

Leased locomotives

The first two of the aforementioned three exceptions, ex IMR numbers 106 and 113, later CSAR numbers 376 and 383 respectively, had been leased to Pauling and Company in 1911 for use on a construction contract. They were only returned to the SAR in January 1913 and then received the numbers 1035 and 1040 respectively. These numbers had apparently been reserved for them even though the numbers were not listed in the 1912 renumbering tables.^[1][2][4][8]

Classification errors

Two locomotives which returned to South Africa from Rhodesia c. 1915 were incorrectly classified, possibly as a result of their records getting exchanged in an apparent administrative error. Each received the class designation and engine number meant for the other.^[1]

• IMR no. 110, the third aforementioned exception, would have become CSAR no. 380 in 1902 but never did, since it had already been transferred to the Beira and Mashonaland and Rhodesia Railways (BMR) at Umtali in March 1901 as replacement for a war-damaged locomotive. In Rhodesia, it was renumbered to MR no. 19. When it was eventually sold back to South Africa and taken onto the SAR roster in 1915, it was incorrectly designated Class 7D instead of Class 7B and renumbered 1355.^[1][9]
• In 1915, the sole aforementioned ex RR locomotive was brought onto the SAR's Class 7B roster as SAR no. 949. It had started its service life as RR no. 1 and was renumbered twice in Rhodesia. In the 1901 Rhodesian renumbering it was renumbered to MR no. 8 on the BMR. In the 1906 Rhodesian renumbering it was renumbered again, this time to no. 63 on the Rhodesia Railways Northern Extensions (RRM, operating north and east of Bulawayo). This locomotive was part of the same batch of ex RR locomotives of which some became SAR Class 7D and it was therefore incorrectly designated Class 7B.^[9][10]

Class 7 sub-classes

Other 7th Class locomotives which came onto the SAR roster from the Colonial and other railways in the region (the CGR, the NGR, some from the RR and, in 1925, from the New Cape Central Railways) were grouped into six different sub-classes by the SAR, becoming SAR Classes 7, 7A and 7C to 7F.^[4][11]

Modifications

Central South African Railways

Beginning in 1904, many of these locomotives were equipped with larger cabs, which gave less cramped working conditions and better regard for the comfort and health of engine crews who worked under the trying conditions of the Transvaal Lowveld. One locomotive, CSAR no. 381, later SAR no. 1058, was also reboilered with a larger round-topped boiler. The reboilered locomotive was reportedly also equipped with Drummond tubes in its firebox, but these were found to be unsatisfactory and were soon removed. The larger boiler enabled the locomotive to take the same load as a Class 8-L2, which was 29% greater than the legitimate load of the 7th Class.^{[1][3][9][12]}

The practice of replacing original boilers with larger boilers of greater weight, capacity and operating steam pressure did not always produce satisfactory results. Considerable success was obtained with such modifications on the CSAR Classes 6-L1 to 6-L3. On the two versions of 5th Class, the fact that they were gradually being replaced on mainline work made the cost of reboilering and modifying the frame unjustifiable. On the reboilered 7th Class locomotive, problems were experienced with overloaded bearings and loose crank pins which led to a decision not to convert any of the others.^{[1][3][9][12]}

South African Railways

During the 1930s, many of the Class 7 series locomotives were equipped with superheated boilers and piston valves. On the Classes 7B and 7C, this conversion was sometimes indicated with an "S" suffix to the class number on the locomotive number plates, but on the rest of the Class 7 family this distinction was rarely applied. The superheated versions could be identified by the position of the chimney on the smokebox. The chimney was displaced forward to provide space behind it in the smokebox for the superheater header.^[3][4][11]

Service

South Africa

In SAR service, the Class 7 series worked on every system in the country. They remained in branch line service until they were finally withdrawn in 1972.^[3][9]

South West Africa

Class 7B on railway line repairs after the Khan River floods of 1934

In 1915, shortly after the outbreak of the First World War, the German South West Africa colony was occupied by the Union Defence Forces. Since a large part of the territory's railway infrastructure and rolling stock was destroyed or damaged by retreating German forces, an urgent need arose for locomotives for use on the Cape gauge lines in that territory. In 1917, numbers 1042 to 1044, 1051 and 1052 were transferred to the Defence Department for service in South West Africa.^[3][9][13]

These five locomotives remained in South West Africa after the war. They proved to be so successful in that territory, that more were gradually transferred there in later years. By the time the Class 24 locomotives arrived in SWA in 1949, 53 locomotives of the Class 7 family were still in use there. Most remained in SWA and were only transferred back to South Africa when the Class 32-000 diesel-electric locomotives replaced them in 1961.^[3][9]

Industry

In 1966, two Class 7B locomotives, numbers 1037 and 1040, as well as two Class 7 and four Class 7A locomotives, were sold to the Zambesi Saw Mills (ZSM) in Zambia. The company worked the teak forests which stretched 100 miles (160 kilometres) to the northwest of Livingstone, where it built one of the longest logging railways in the world to serve its sawmill at Mulobezi. These eight locomotives joined eight ex RR 7th Class locomotives which had been acquired by the ZSM between 1925 and 1956.^[9]

Railway operations ceased at Mulobezi c. 1972, whilst operation of the line to Livingstone was taken over by the Zambia Railways in 1973. While most of the 7th Class series locomotives remained at Mulobezi out of use, Class 7A no. 1021 and Class 7B no. 1040 were installed as stationary boilers at the Livingstone factory to supply steam for curing wood. No. 1040 was still in use in that role in October 1995, when it was found in steam.^[10]

Works numbers

The table lists all their works numbers and renumbering, except the multiple Rhodesian renumbering of SAR no. 949.^[1][2][4][5]

Illustration

The main picture shows SAR Class 7BS no. 1056 (ex IMR no. 123, CSAR no. 389 and NGR no. 328) at Voorbaai on 4 September 1997. Some of the modifications and applications of the Class 7B are illustrated below.

References

Wikimedia Commons has media related to South African Class 7B 4-8-0.

Locomotives of the Central South African Railways
3' 6" gauge	CSAR 0-6-0ST 1896 CSAR 4-6-0T 1887 CSAR Class 6-L1 CSAR Class 6-L2 CSAR Class 6-L3 CSAR Class 7 CSAR Class 8-L1 CSAR Class 8-L2 CSAR Class 8-L3 CSAR Class 9 CSAR Class 10 1904 CSAR Class 10 1910 CSAR Class 10-2 Saturated CSAR Class 10-2 Superheated CSAR Class 10-C CSAR Class 11 CSAR Class B 0-6-4T CSAR Class C 2-8-4T CSAR Class D CSAR Class E 4-8-0TT CSAR Class E 4-8-2T CSAR Class E 4-10-2T CSAR Class F CSAR Class M CSAR Mallet Saturated CSAR Mallet Stoker CSAR Mallet Superheated CSAR Rack 4-6-4RT CSAR Railmotor IMR 0-6-0ST 1896 IMR 4-6-0T 1887 IMR 46 Tonner 0-6-4T IMR 55 Tonner 2-6-4T IMR 7th Class 4-8-0 IMR 8th Class 4-8-0 IMR Reid Tenwheeler 4-10-2T IMR Western Australian 2-8-4T NZASM 10 Tonner NZASM 13 Tonner NZASM 14 Tonner NZASM 18 Tonner NZASM 19 Tonner NZASM 32 Tonner NZASM 40 Tonner NZASM 46 Tonner OVGS 1st Class 4-4-0TT OVGS 2nd Class 2-6-0 OVGS 2nd Class 2-6-0ST OVGS 3rd Class 4-4-0 OVGS 4th Class G 4-6-0 OVGS 5th Class K 4-6-0 1890 OVGS 5th Class K 4-6-0 1891 OVGS 6th Class L 4-6-0 OVGS 6th Class L2 4-6-0 OVGS 6th Class L3 4-6-0 PPR 0-4-0ST Natal PPR 26 Tonner PPR 35 Tonner Portuguese PPR 55 Tonner
2' gauge	CSAR Pankop
List of South African locomotive classes South African locomotive history

Locomotives of Natal
4' 8½" gauge	Natal 0-4-0ST Durban Natal 0-4-0WT Natal Natal 4-4-0T Perseverance
3' 6" gauge	Durban's Congella Durban's Edward Innes Durban's John Milne Durban's Sir Albert NGR Class A 1905 NGR Class A 1910 NGR Class B 4-8-0 1904 NGR Class B 4-8-0 1910 NGR Class B 4-8-2 1906 NGR Class B 4-8-2 1909 NGR Class B 4-8-2 1910 NGR Class C 4-8-2T NGR Class C 4-10-2T NGR Class D NGR Class E NGR Class F NGR Class G NGR Class H 4-6-2T NGR Class H 4-6-4T NGR Class I 2-6-0 NGR Class I 2-6-2T NGR Class K 0-4-0ST NGR Class K 0-6-0ST NGR Class K 2-6-0T NGR Class L 4-8-0 NGR Durban & Pietermaritzburg NGR Havelock NGR Mallet 1909 NGR Mallet 1910
2' gauge	NGR Class N 1906 NGR Class N 1907 NGR Class N 1911
List of South African locomotive classes South African locomotive history

Locomotives of Rhodesia and Zimbabwe
Steam	6th 6A 7th 8th 9th 9A 9B 10th 11th 11A 12th 12A 13th 14th 14A 15th 15A 16th 16A 17th 18th 19th 20th 20A
Diesel	DE1 DE2 DE3 DE4 DE5 DE6 DE7 DE8 DE8A DE8B DE9 DE9A DH1 DE10 DE10A DE10B
Electric	EL1

Locomotives of South Africa
Steam	7' ¼" gauge East London 0-4-0VB Table Bay 0-4-0ST Table Bay 0-4-0T Table Bay 0-4-0WT 4' 8½" gauge Cape 0-4-0T Blackie Cape 0-4-2 Cape 2-4-0T CGR 0-4-0ST Aid Natal 0-4-0ST Durban Natal 0-4-0WT Natal Natal 4-4-0T Perseverance 3' 6" gauge Tank engines CGR 0-4-0ST 1873 CGR 0-4-0ST 1874 CGR 0-4-0ST 1881 CGR 0-4-0ST 1881 Coffee Pot CGR 0-6-0ST CGR 0-6-0T CGR 2-6-0ST 1900 CGR 2-6-0ST 1902 CGR 1st Class 0-4-0ST 1875 CGR 1st Class 0-4-0ST 1876 CGR 1st Class 2-6-0ST CGR 1st Class 4-4-0T CGR 2nd Class 4-4-0T CGR 3rd Class 2-6-0T CGR Railmotor CSAR Class C CSAR Class E CSAR Rack 4-6-4RT CSAR Railmotor Durban's Congella Durban's Edward Innes Durban's John Milne Durban's Sir Albert Port Elizabeth 0-4-0ST Kowie Railway 0-6-0T Kowie Railway 4-4-0T Metropolitan & Suburban 4-6-2T NGR 2-6-0T Durban & Pietermaritzburg NGR Class I 2-6-2T NGR Class K 0-4-0ST NGR Class K 0-6-0ST NGR Class K 2-6-0T NZASM 10 Tonner NZASM 13 Tonner NZASM 14 Tonner NZASM 18 Tonner NZASM 19 Tonner NZASM 32 Tonner NZASM 40 Tonner PPR 26 Tonner PPR 35 Tonner Portuguese SAR Class A SAR Class B SAR Class C SAR Class C1 SAR Class C2 SAR Class D SAR Class E SAR Class F SAR Class G SAR Class H SAR Class H1 SAR Class H2 SAR Class J SAR Class K SAR Railmotor SAR Dock 0-4-0ST SAR Dock 0-4-0T SWA 2-8-0T 3' 6" gauge Tender engines CGR 1st Class 2-6-0 1876 BP CGR 1st Class 2-6-0 1876 Kitson CGR 1st Class 2-6-0 1879 CGR 1st Class 2-6-0 1891 CGR 1st Class 4-4-0 CGR 1st Class 4-4-0TT CGR 2nd Class 2-6-2TT CGR 3rd Class 4-4-0 1883 CGR 3rd Class 4-4-0 1884 CGR 3rd Class 4-4-0 1889 CGR 3rd Class 4-4-0 1898 CGR 3rd Class 4-4-0 1901 CGR 3rd Class 4-4-0 1903 CGR 4th Class 4-4-2 CGR 4th Class 4-6-0TT 1880 CGR 4th Class 4-6-0TT 1882 CGR 4th Class 4-6-0TT 1882 Joy CGR 4th Class 4-6-0TT 1884 CGR 5th Class 4-6-0 1890 CGR 5th Class 4-6-0 1891 NGR Havelock NGR Class I SAR Class Exp 1 SAR Class Exp 2 SAR Class Exp 3 SAR Class Exp 4 SAR Class Exp 5 SAR Class Exp 6 SAR Class S SAR Class S1 SAR Class S2 SAR Class 1 SAR Class 1A SAR Class 1B SAR Class 2 SAR Class 2C SAR Class 3 SAR Class 3A SAR Class 3B SAR Class 4 SAR Class 4A SAR Class 5 SAR Class 5A SAR Class 5B SAR Class 6 SAR Class 6A SAR Class 6B SAR Class 6C SAR Class 6D SAR Class 6E SAR Class 6F SAR Class 6G SAR Class 6H SAR Class 6J SAR Class 6K SAR Class 6L SAR Class 6Y SAR Class 6Z SAR Class 7 SAR Class 7A SAR Class 7B SAR Class 7C SAR Class 7D SAR Class 7E SAR Class 7F SAR Class 8 SAR Class 8A SAR Class 8B SAR Class 8C SAR Class 8D SAR Class 8E SAR Class 8F SAR Class 8R SAR Class 8X SAR Class 8Y SAR Class 8Z SAR Class 9 SAR Class 10 SAR Class 10A SAR Class 10B SAR Class 10C SAR Class 10D SAR Class 11 SAR Class 12 SAR Class 12A SAR Class 12B SAR Class 13 SAR Class 14 SAR Class 14A SAR Class 14B SAR Class 14C 1st SAR Class 14C 2nd SAR Class 14C 3rd SAR Class 14C 4th SAR Class 15 SAR Class 15A SAR Class 15B SAR Class 15C SAR Class 15CA SAR Class 15E SAR Class 15F SAR Class 16 SAR Class 16A SAR Class 16B SAR Class 16C SAR Class 16D SAR Class 16DA 1928 SAR Class 16DA 1930 SAR Class 16E SAR Class 17 SAR Class 18 SAR Class 19 SAR Class 19A SAR Class 19B SAR Class 19C SAR Class 19D SAR Class 20 SAR Class 21 SAR Class 23 SAR Class 24 SAR Class 25 SAR Class 25NC SAR Class 26 SAR Katanga SWA 2-8-0 3' 6" gauge Articulated engines CGR Fairlie CGR Kitson-Meyer SAR Class FC SAR Class FD SAR Class GA SAR Class GB SAR Class GC SAR Class GCA SAR Class GD SAR Class GDA SAR Class GE SAR Class GEA SAR Class GF SAR Class GG SAR Class GH SAR Class GK SAR Class GL SAR Class GM SAR Class GMA SAR Class GO SAR Class HF SAR Class KM SAR Class MA SAR Class MB SAR Class MC SAR Class MC1 SAR Class MD SAR Class ME SAR Class MF SAR Class MG SAR Class MH SAR Class MJ SAR Class MJ1 SAR Class U 2' 6" gauge Cape Copper John King & Miner Cape Copper Britannia Cape Copper Caledonia Cape Copper Clara Cape Copper Condenser Cape Copper Scotia Namaqua Copper Pioneer Walvis Bay 2-4-2T Hope 2' & 600mm gauges ACR Class NG-G16A CGR NG 0-4-0T CGR NG 0-6-0T CGR NG 4-6-2T CGR Type A 2-6-4T CGR Type C 0-4-0T NGR Class N 4-6-2T SAR Dutton SAR NG 0-4-0T SAR Class NG1 SAR Class NG2 SAR Class NG3 SAR Class NG4 SAR Class NG5 SAR Class NG6 SAR Class NG7 SAR Class NG8 SAR Class NG9 SAR Class NG10 SAR Class NG-G11 SAR Class NG-G12 SAR Class NG-G13 SAR Class NG-G14 SAR Class NG15 SAR Class NG-G16 SWA Class Ha SWA Class Hb SWA Class Hc SWA Class Hd SWA Jung SWA Zwillinge
Electric	Amcoal Class E38 SAR Class ES SAR Class ES1 SAR Class Exp-AC SAR Class 1E SAR Class 2E SAR Class 3E SAR Class 4E SAR Class 5E s1 SAR Class 5E s2 SAR Class 5E s3 SAR Class 5E1 s1 SAR Class 5E1 s2 SAR Class 5E1 s3 SAR Class 5E1 s4 SAR Class 5E1 s5 SAR Class 6E SAR Class 6E1 s1 SAR Class 6E1 s2 SAR Class 6E1 s3 SAR Class 6E1 s4 SAR Class 6E1 s5 SAR Class 6E1 s6 SAR Class 6E1 s7 SAR Class 6E1 s8 SAR Class 6E1 s9 SAR Class 6E1 s10 SAR Class 6E1 s11 SAR Class 7E SAR Class 7E1 SAR Class 7E2 s1 SAR Class 7E2 s2 SAR Class 7E3 s1 SAR Class 7E3 s2 Spoornet Class 7E4 SAR Class 8E SAR Class 9E s1 SAR Class 9E s2 SAR Class 10E SAR Class 10E1 s1 Spoornet Class 10E1 s2 SAR Class 10E2 SAR Class 11E SAR Class 12E Spoornet Class 14E Spoornet Class 14E1 TFR Class 15E Spoornet Class 16E Spoornet Class 17E Spoornet Class 18E s1 TFR Class 18E s2 TFR Class 19E TFR Class 20E TFR Class 21E TFR Class 22E
Gas-electric	SAR Gas-electric
Diesel	3' 6" gauge Diesel-electric PRASA Class Afro 4000 SAR Class DS SAR Class DS1 SAR Class 31-000 SAR Class 32-000 SAR Class 32-200 SAR Class 33-000 SAR Class 33-200 SAR Class 33-400 SAR Class 34-000 SAR Class 34-200 SAR Class 34-400 SAR Class 34-500 SAR Class 34-600 SAR Class 34-800 SAR Class 34-900 SAR Class 35-000 SAR Class 35-200 SAR Class 35-400 SAR Class 35-600 TFR Class 35-800 SAR Class 36-000 SAR Class 36-200 SAR Class 37-000 Spoornet Class 39-000 TFR Class 39-200 TFR Class 43-000 TFR Class 44-000 2' gauge Diesel-electric SAR Class 91-000 3' 6" gauge Diesel-hydraulic SAR Class 61-000 3' 6" gauge Electro-diesel Spoornet Class 38-000
List of South African locomotive classes South African locomotive numbering and classification

South African steam locomotive tenders
Cape gauge	Type CL Type CZ Type ET Type ET1 Type EW Type EW1 Type EW2 Type FT Type GT Type HT Type JT Type JT1 Type JV Type KT Type LP Type MP Type MP1 Type MR Type MS Type MT Type MT1 Type MT2 Type MX Type MY Type MY1 Type SH Type SK Type TJ Type TL Type TM Type WE Type WG Type X-17 Type X-20 Type XC Type XC1 Type XD Type XE Type XE1 Type XF Type XF1 Type XF2 Type XJ Type XM Type XM1 Type XM2 Type XM3 Type XM4 Type XP1 Type XS Type YB Type YC Type YE Type YE1 Type ZA Type ZB Type ZC Type ZE
List of South African locomotive classes South African locomotive history