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Specifications
Specifications
Configuration:;
• Whyte	4-6-0 (Tenwheeler)
• UIC	2'Cn2
Driver	2nd coupled axle
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	28+1⁄2 in (724 mm)
Coupled dia.	54 in (1,372 mm)
Tender wheels	33+1⁄2 in (851 mm)
Wheelbase	47 ft 2+1⁄2 in (14,389 mm)
• Axle spacing; (Asymmetrical)	1-2: 4 ft 9 in (1,448 mm); 2-3: 6 ft 7 in (2,007 mm)
• Engine	20 ft 8 in (6,299 mm)
• Leading	5 ft 6 in (1,676 mm)
• Coupled	11 ft 4 in (3,454 mm)
• Tender	16 ft 1 in (4,902 mm)
• Tender bogie	4 ft 7 in (1,397 mm)
Length:;
• Over couplers	54 ft 6+5⁄8 in (16,627 mm)
Height	12 ft 10 in (3,912 mm)
Frame type	Bar
Axle load	12 LT 7 cwt (12,550 kg)
• Leading	10 LT 11 cwt (10,720 kg)
• 1st coupled	12 LT 7 cwt (12,550 kg)
• 2nd coupled	12 LT 6 cwt (12,500 kg)
• 3rd coupled	12 LT 7 cwt (12,550 kg)
• Tender bogie	Bogie 1: 17 LT 14 cwt (17,980 kg); Bogie 2: 18 LT 14 cwt (19,000 kg)
Adhesive weight	37 LT (37,590 kg)
Loco weight	47 LT 11 cwt (48,310 kg)
Tender weight	36 LT 8 cwt (36,980 kg)
Total weight	83 LT 19 cwt (85,300 kg)
Tender type	2-axle bogies
Fuel type	Coal
Fuel capacity	6 LT (6.1 t)
Water cap.	2,780 imp gal (12,600 L)
Firebox:
• Type	Round-top
• Grate area	18.75 sq ft (1.742 m2)
Boiler:;
• Pitch	6 ft 9 in (2,057 mm)
• Diameter	4 ft 7 in (1,397 mm)
• Tube plates	11 ft 2+1⁄8 in (3,407 mm)
• Small tubes	182: 2 in (51 mm)
Boiler pressure	180 psi (1,241 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	105 sq ft (9.8 m2)
• Tubes	1,065 sq ft (98.9 m2)
• Total surface	1,170 sq ft (109 m2)
Cylinders	Two
Cylinder size	17 in (432 mm) bore; 26 in (660 mm) stroke
Valve gear	Stephenson
Couplers	Johnston link-and-pin

Type and origin
Type and origin
Power type	Steam
Designer	Cape Government Railways; (H.M. Beatty)
Builder	Sharp, Stewart and Company
Serial number	4631–4632
Model	CGR 6th Class
Build date	1900
Total produced	2

CGR 6th Class 4-6-0 1900
South African Class 6F 4-6-0
CGR 6th Class 4-6-0 1900; South African Class 6F 4-6-0
	Ex CGR 6th Class, SAR Class 6F
Power type
Type and origin
Power type	Steam
Designer	Cape Government Railways; (H.M. Beatty)
Builder	Sharp, Stewart and Company
Serial number	4631–4632
Model	CGR 6th Class
Build date	1900
Total produced	2
Configuration:;
Specifications
Configuration:;
• Whyte	4-6-0 (Tenwheeler)
• UIC	2'Cn2
Driver	2nd coupled axle
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	28+1⁄2 in (724 mm)
Coupled dia.	54 in (1,372 mm)
Tender wheels	33+1⁄2 in (851 mm)
Wheelbase	47 ft 2+1⁄2 in (14,389 mm)
• Axle spacing; (Asymmetrical)	1-2: 4 ft 9 in (1,448 mm); 2-3: 6 ft 7 in (2,007 mm)
• Engine	20 ft 8 in (6,299 mm)
• Leading	5 ft 6 in (1,676 mm)
• Coupled	11 ft 4 in (3,454 mm)
• Tender	16 ft 1 in (4,902 mm)
• Tender bogie	4 ft 7 in (1,397 mm)
Length:;
• Over couplers	54 ft 6+5⁄8 in (16,627 mm)
Height	12 ft 10 in (3,912 mm)
Frame type	Bar
Axle load	12 LT 7 cwt (12,550 kg)
• Leading	10 LT 11 cwt (10,720 kg)
• 1st coupled	12 LT 7 cwt (12,550 kg)
• 2nd coupled	12 LT 6 cwt (12,500 kg)
• 3rd coupled	12 LT 7 cwt (12,550 kg)
• Tender bogie	Bogie 1: 17 LT 14 cwt (17,980 kg); Bogie 2: 18 LT 14 cwt (19,000 kg)
Adhesive weight	37 LT (37,590 kg)
Loco weight	47 LT 11 cwt (48,310 kg)
Tender weight	36 LT 8 cwt (36,980 kg)
Total weight	83 LT 19 cwt (85,300 kg)
Tender type	2-axle bogies
Fuel type	Coal
Fuel capacity	6 LT (6.1 t)
Water cap.	2,780 imp gal (12,600 L)
Firebox:
• Type	Round-top
• Grate area	18.75 sq ft (1.742 m2)
Boiler:;
• Pitch	6 ft 9 in (2,057 mm)
• Diameter	4 ft 7 in (1,397 mm)
• Tube plates	11 ft 2+1⁄8 in (3,407 mm)
• Small tubes	182: 2 in (51 mm)
Boiler pressure	180 psi (1,241 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	105 sq ft (9.8 m2)
• Tubes	1,065 sq ft (98.9 m2)
• Total surface	1,170 sq ft (109 m2)
Cylinders	Two
Cylinder size	17 in (432 mm) bore; 26 in (660 mm) stroke
Valve gear	Stephenson
Couplers	Johnston link-and-pin
Tractive effort
Performance figures
Tractive effort	18,780 lbf (83.5 kN) @ 75%
Operators
Career
Operators	Cape Government Railways; South African Railways
Class	CGR 6th Class, SAR Class 6F
Number in class	2
Numbers	CGR 260-261; SAR 604-605
Delivered	1900
First run	1900
Withdrawn	1929

The South African Railways Class 6F 4-6-0 of 1900 was a steam locomotive from the pre-Union era in the Cape of Good Hope.

In 1900, two redesigned 6th Class 4-6-0 steam locomotives were placed in service by the Cape Government Railways. In 1912, when they were assimilated into the South African Railways, they were renumbered and designated Class 6F.^[1]^[2]^[3]

Manufacturer

The original 6th Class 4-6-0 passenger steam locomotive was designed at the Salt River works of the Cape Government Railways (CGR) in 1893, at the same time as the 7th Class and both according to the specifications of Michael Stephens, then Chief Locomotive Superintendent of the CGR, and under the supervision of H.M. Beatty, then Locomotive Superintendent of the Western System.^[1]

The two 6th Class locomotives which entered service on the CGR in 1900 were built by Sharp, Stewart and Company, numbered 260 and 261 and allocated to the Western System. They were equipped with large commodious cabs, which were to become standard in all subsequent designs. They had larger heating surfaces and grate areas than any of the previous 6th Class locomotives, with the boiler pressure increased to 180 pounds per square inch (1,241 kilopascals) and with larger tenders which rode on bogies. They differed in appearance from all previous 6th Class locomotives by having higher mounted running boards without coupled wheel fairings. They proved to be good engines and were better steamers.^[1]

These engines reflected the decision by Beatty, who had succeeded Michael Stephens as Chief Locomotive Superintendent in 1895, to adopt bar frames for future CGR locomotives. He thereby demonstrated that, while still keeping to the good points of the locomotives he had designed under Stephens' supervision, he was preparing to adopt his own ideas in his future locomotive designs.^[1]

Class 6 sub-classes

When the Union of South Africa was established on 31 May 1910, the three Colonial government railways (CGR, Natal Government Railways 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.^[2]^[4]

When these two locomotives were assimilated into the South African Railways (SAR) in 1912, they were renumbered 604 and 605 and designated Class 6F.^[2]^[5]^[6]

The rest of the CGR's 6th Class locomotives, together with 6th Class locomotives which had been inherited from the Oranje-Vrijstaat Gouwerment-Spoorwegen (OVGS) via the Imperial Military Railways (IMR) and the Central South African Railways (CSAR), were grouped into thirteen more sub-classes by the SAR. The 4-6-0 locomotives became SAR Classes 6, 6A to 6E, 6G, 6H and 6J to 6L, the 2-6-2 locomotives became Class 6Y and the 2-6-4 locomotives became Class 6Z.^[2]^[5]^[6]

Service

The Class 6 series of locomotives were introduced primarily as passenger locomotives, but when the class became displaced by larger and more powerful locomotive classes, it literally became a Jack-of-all-trades which proved itself as one of the most useful and successful locomotive classes ever to be designed at the Salt River shops. It went on to see service in all parts of the country, except in Natal, and was used on all types of traffic.^[1]

The two Class 6F locomotives were placed in service on the Cape mainline. Compared to most of the rest of the Class 6 family, they had a relatively short lifespan of less than thirty years and were withdrawn from service by 1929.^[3]

References

^ ^a ^b ^c ^d ^e Holland, D.F. (1971). Steam Locomotives of the South African Railways. Vol. 1: 1859–1910 (1st ed.). Newton Abbott, England: David & Charles. pp. 47–48, 56. ISBN 978-0-7153-5382-0.
^ ^a ^b ^c ^d Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer's Office, Pretoria, January 1912, pp. 8, 12, 14, 32 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000)
^ ^a ^b Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. p. 43. ISBN 0869772112.
^ The South African Railways - Historical Survey. Editor George Hart, Publisher Bill Hart, Sponsored by Dorbyl Ltd., Published c. 1978, p. 25.
^ ^a ^b Holland, D. F. (1972). Steam Locomotives of the South African Railways. Vol. 2: 1910-1955 (1st ed.). Newton Abbott, England: David & Charles. pp. 137–138. ISBN 978-0-7153-5427-8.
^ ^a ^b South African Railways and Harbours Locomotive Diagram Book, 2'0" & 3'6" Gauge Steam Locomotives, 15 August 1941, as amended