South African Class 7F 4-8-0
|South African Class 7F 4-8-0
ex New Cape Central 7th Class 4-8-0
Ex New Cape Central Railway 7th Class no. 10
South African Railways Class 7F no. 1358
|Designer||Cape Government Railways|
|Builder||North British Locomotive Company|
|Serial number||20217-20219 |
|Model||CGR 7th Class|
|Gauge||3 ft 6 in (1,067 mm) Cape gauge|
|28.5 in (723.900 mm)|
|Driver diameter||42.75 in (1,090 mm)|
|Wheelbase||Total: 46 ft 6 in (14.173 m)
5 ft 3 in (1.600 m) bogie
12 ft (3.658 m) coupled
21 ft 3.5 in (6.490 m) total
4 ft 7 in (1.397 m) bogie
16 ft 1 in (4.902 m) total
|Length||53 ft 9.125 in (16.386 m)|
|Height||12 ft 10 in (3.912 m)|
|Axle load||9.8 long tons (10.0 t) on 1st & 3rd drivers|
|Weight on drivers||39 long tons (39.6 t)|
|Locomotive weight||49.7 long tons (50.5 t)|
|Tender weight||38,960 lb (17.7 t) empty
35.5 long tons (36.1 t) w/o
|Locomotive and tender
|106,232 lb (48.2 t) empty
85.2 long tons (86.6 t) w/o
|Tender type||ZC - ZA, ZB, ZC, ZE permitted
* 2 axle bogies
* 34 in (864 mm) wheels
* Length 23 ft 9.25 in (7.245 m)
|Fuel capacity||6.5 long tons (6.6 t)|
|Water capacity||2,600 imp gal (12,000 l)|
|Boiler||4 ft 6 in (1.372 m) inside diameter
10 ft 9 in (3.277 m) inside length
7 ft 3 in (2.210 m) pitch
|Boiler pressure||180 psi (1,240 kPa)|
|Firegrate area||18 sq ft (1.672 m2)|
|185 tubes 1.875 in (47.6 mm) diameter
976 sq ft (90.673 m2)
|– Firebox||119 sq ft (11.055 m2)|
|– Total||1,095 sq ft (101.729 m2)|
|Cylinder size||17.5 in (444 mm) bore
23 in (584 mm) stroke
|Tractive effort||22,240 lbf (98.9 kN) at 75% boiler pressure |
|Railroad(s)||New Cape Central Railway
South African Railways
|Class||NCCR 7th Class, SAR Class 7F|
|Number in class||3|
|Number||NCCR 9-11, SAR 1357-1359 |
In 1913 the New Cape Central Railway placed three Cape 7th Class 4-8-0 Mastodon steam locomotives in service. In 1925, when the New Cape Central Railway was amalgamated into the South African Railways, these three locomotives were renumbered and reclassified to Class 7F.
New Cape Central Railway
The New Cape Central Railway (NCCR) was formed in January 1893 when it purchased all the assets of the bankrupted Cape Central Railway (CCR), who had constructed a line from Worcester via Robertson to Roodewal, now Ashton. In 1894 the NCCR began work to extend the line to Swellendam. From there it continued via Heidelberg to Riversdale, which was reached on 3 December 1903. Mosselbaai was reached in 1904.
Unlike most other privately owned railways in South Africa, the NCCR prospered and was well and efficiently run. It was the last component to be added to the South African Railways (SAR) when it was amalgamated in May 1925. All the NCCR locomotives that came onto the SAR roster continued to give good service for many years.
These last three NCCR 7th Class locomotives were ordered from and built by the North British Locomotive Company (NBL) in 1913, numbered in the range from NCCR 9 to 11. While there was little difference from the original Cape 7th Class design as far as the main dimensions were concerned, these three locomotives were more modern in appearance. They were more powerful with a higher boiler pressure of 180 pounds per square inch (1,240 kilopascals) and 17.5 inches (444 millimetres) bore cylinders instead of the 17 inches (432 millimetres) bore of all but one (the Class 7C) of the earlier models.
Other differences were the boiler centre line that was raised to 7 feet 3 inches (2.210 metres), a boiler diameter that was increased to 4 feet 6 inches (1.372 metres), the total boiler heating surface that was increased to 1,095 square feet (101.7 square metres), tractive effort that was increased to 22,240 pounds-force (98.9 kilonewtons) and a factor of adhesion that was reduced to 3.928.
Visually obvious alterations were the smokebox saddle and the running boards. The distinctive covered smokebox saddle of earlier 7th Class locomotives was replaced with an exposed one. The running boards were no longer straight all the way through from buffer beam to cab end, but dipped ahead of the smokebox and beneath the cab, giving it the appearance of a Hendrie-designed locomotive.
Class 7 sub-classes
Other 7th Class locomotives that had come onto the SAR roster from the other railways in the region in 1912, namely the Cape Government Railways (CGR), Central South African Railways (CSAR), the Natal Government Railways (NGR) and the Rhodesian Railways (RR), as well as earlier NCCR 7th Class locomotive models, were grouped into six different sub-classes by the SAR, becoming SAR Classes 7 and 7A to 7E.
In SAR service, the Class 7 family did duty on every system in the country. They remained in branch line service, particularly at Tarkastad and Ladysmith and also on the branch line from Touws River to Ladismith until the last ones were withdrawn in 1972. The Class 7F, however, had a shorter life span and all three locomotives were withdrawn by 1940.
- South African Class 7 4-8-0
- South African Class 7A 4-8-0
- South African Class 7B 4-8-0
- South African Class 7C 4-8-0
- South African Class 7D 4-8-0
- South African Class 7E 4-8-0
- Tender locomotive numbering and classification
- The 4-8-0 "Mastodon"
- List of South African locomotive classes
- Holland, D.F. (1971). Steam Locomotives of the South African Railways, Volume 1: 1859-1910 (1st ed.). Newton Abbott, Devon: David & Charles. pp. 78–80. ISBN 978-0-7153-5382-0.
- North British Locomotive Company works list, compiled by Austrian locomotive historian Bernhard Schmeiser
- South African Railways and Harbours Locomotive Diagram Book, 2’0” & 3’6” Gauge Steam Locomotives, 15 August 1941, as amended
- Pattison, R.G. (1997). The Cape Seventh Class Locomotives (1st ed.). Kenilworth, Cape Town: The Railway History Group. pp. 15–16. ISBN 0958400946.
- Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 46–48. ISBN 0869772112.