South African Class 6A 4-6-0

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	37 in (940 mm)
Wheelbase	42 ft 5⁄8 in (12,817 mm)
• Axle spacing; (Asymmetrical)	1-2: 4 ft 9 in (1,448 mm); 2-3: 6 ft 3 in (1,905 mm)
• Engine	20 ft 3+3⁄4 in (6,191 mm)
• Leading	5 ft 5+1⁄2 in (1,664 mm)
• Coupled	11 ft (3,353 mm)
• Tender	10 ft (3,048 mm)
Length:;
• Over couplers	51 ft 3+5⁄8 in (15,637 mm)
Height	♠ 12 ft 10 in (3,912 mm); ♥ 12 ft 10+3⁄8 in (3,921 mm)
Frame type	Plate
Axle load	♠ 11 LT 18 cwt (12,090 kg); ♥ 13 LT 8 cwt (13,620 kg)
• Leading	♠ 11 LT 7 cwt (11,530 kg); ♥ 10 LT 17 cwt 2 qtr (11,050 kg)
• Coupled	♥ 13 LT 8 cwt (13,620 kg)
• 1st coupled	♠ 11 LT 5 cwt (11,430 kg)
• 2nd coupled	♠ 11 LT 18 cwt (12,090 kg)
• 3rd coupled	♠ 11 LT 5 cwt (11,430 kg)
• Tender axle	10 LT 8 cwt (10,570 kg) average
Adhesive weight	♠ 34 LT 8 cwt (34,950 kg); ♥ 40 LT 4 cwt (40,850 kg)
Loco weight	♠ 45 LT 15 cwt (46,480 kg); ♥ 51 LT 1 cwt 2 qtr (51,890 kg)
Tender weight	31 LT 4 cwt (31,700 kg)
Total weight	♠ 76 LT 19 cwt (78,180 kg); ♥ 82 LT 5 cwt 2 qtr (83,600 kg)
Tender type	YC (3-axle); YB, YC, YE, YE1 permitted
Fuel type	Coal
Fuel capacity	5 LT 10 cwt (5.6 t)
Water cap.	2,590 imp gal (11,770 L)
Firebox:
• Type	♠ Round-top – ♥ Belpaire
• Grate area	♠ 16.625 sq ft (1.5445 m2); ♥ 16.6 sq ft (1.54 m2)
Boiler:;
• Pitch	♠ 6 ft 8 in (2,032 mm); ♥ 7 ft (2,134 mm)
• Diameter	♠ 4 ft 4 in (1,321 mm); ♥ 4 ft 9 in (1,448 mm)
• Tube plates	♠ 11 ft 2+1⁄8 in (3,407 mm); ♥ 11 ft 2+1⁄8 in (3,407 mm)
• Small tubes	♠ 185: 1+7⁄8 in (48 mm); ♥ 220: 2 in (51 mm)
Boiler pressure	♠ 160 psi (1,103 kPa); ♥ 180 psi (1,241 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	♠ 101 sq ft (9.4 m2); ♥ 111 sq ft (10.3 m2)
• Tubes	♠ 1,015 sq ft (94.3 m2); ♥ 1,287.5 sq ft (119.61 m2)
• Total surface	♠ 1,116 sq ft (103.7 m2); ♥ 1,398.5 sq ft (129.92 m2)
Cylinders	Two
Cylinder size	17 in (432 mm) bore; 26 in (660 mm) stroke
Valve gear	Stephenson
Couplers	Johnston link-and-pin; AAR knuckle (1930s)

Type and origin
Type and origin
	♠ Original locomotive, as built; ♥ Locomotive equipped with Belpaire firebox
Power type	Steam
Designer	Cape Government Railways; (H.M. Beatty)
Builder	Dübs and Company; Sharp, Stewart and Company
Serial number	Dübs:; 3330, 3332-3335, 3337, 3345-3347, 3437-3439, 3441-3447, 3449-3456, 3460-3466, 3469-3471, 3475-3476; Sharp Stewart:; 4116-4119, 4122-4127, 4144
Model	CGR 6th Class
Build date	1895–1897
Total produced	50

CGR 6th Class 4-6-0 1896
South African Class 6A 4-6-0
CGR 6th Class 4-6-0 1896; South African Class 6A 4-6-0
	SAR no. 444 with a Belpaire firebox,; near Clovelly, c. 1930
Power type
Type and origin
	♠ Original locomotive, as built; ♥ Locomotive equipped with Belpaire firebox
Power type	Steam
Designer	Cape Government Railways; (H.M. Beatty)
Builder	Dübs and Company; Sharp, Stewart and Company
Serial number	Dübs:; 3330, 3332-3335, 3337, 3345-3347, 3437-3439, 3441-3447, 3449-3456, 3460-3466, 3469-3471, 3475-3476; Sharp Stewart:; 4116-4119, 4122-4127, 4144
Model	CGR 6th Class
Build date	1895–1897
Total produced	50
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	37 in (940 mm)
Wheelbase	42 ft 5⁄8 in (12,817 mm)
• Axle spacing; (Asymmetrical)	1-2: 4 ft 9 in (1,448 mm); 2-3: 6 ft 3 in (1,905 mm)
• Engine	20 ft 3+3⁄4 in (6,191 mm)
• Leading	5 ft 5+1⁄2 in (1,664 mm)
• Coupled	11 ft (3,353 mm)
• Tender	10 ft (3,048 mm)
Length:;
• Over couplers	51 ft 3+5⁄8 in (15,637 mm)
Height	♠ 12 ft 10 in (3,912 mm); ♥ 12 ft 10+3⁄8 in (3,921 mm)
Frame type	Plate
Axle load	♠ 11 LT 18 cwt (12,090 kg); ♥ 13 LT 8 cwt (13,620 kg)
• Leading	♠ 11 LT 7 cwt (11,530 kg); ♥ 10 LT 17 cwt 2 qtr (11,050 kg)
• Coupled	♥ 13 LT 8 cwt (13,620 kg)
• 1st coupled	♠ 11 LT 5 cwt (11,430 kg)
• 2nd coupled	♠ 11 LT 18 cwt (12,090 kg)
• 3rd coupled	♠ 11 LT 5 cwt (11,430 kg)
• Tender axle	10 LT 8 cwt (10,570 kg) average
Adhesive weight	♠ 34 LT 8 cwt (34,950 kg); ♥ 40 LT 4 cwt (40,850 kg)
Loco weight	♠ 45 LT 15 cwt (46,480 kg); ♥ 51 LT 1 cwt 2 qtr (51,890 kg)
Tender weight	31 LT 4 cwt (31,700 kg)
Total weight	♠ 76 LT 19 cwt (78,180 kg); ♥ 82 LT 5 cwt 2 qtr (83,600 kg)
Tender type	YC (3-axle); YB, YC, YE, YE1 permitted
Fuel type	Coal
Fuel capacity	5 LT 10 cwt (5.6 t)
Water cap.	2,590 imp gal (11,770 L)
Firebox:
• Type	♠ Round-top – ♥ Belpaire
• Grate area	♠ 16.625 sq ft (1.5445 m2); ♥ 16.6 sq ft (1.54 m2)
Boiler:;
• Pitch	♠ 6 ft 8 in (2,032 mm); ♥ 7 ft (2,134 mm)
• Diameter	♠ 4 ft 4 in (1,321 mm); ♥ 4 ft 9 in (1,448 mm)
• Tube plates	♠ 11 ft 2+1⁄8 in (3,407 mm); ♥ 11 ft 2+1⁄8 in (3,407 mm)
• Small tubes	♠ 185: 1+7⁄8 in (48 mm); ♥ 220: 2 in (51 mm)
Boiler pressure	♠ 160 psi (1,103 kPa); ♥ 180 psi (1,241 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	♠ 101 sq ft (9.4 m2); ♥ 111 sq ft (10.3 m2)
• Tubes	♠ 1,015 sq ft (94.3 m2); ♥ 1,287.5 sq ft (119.61 m2)
• Total surface	♠ 1,116 sq ft (103.7 m2); ♥ 1,398.5 sq ft (129.92 m2)
Cylinders	Two
Cylinder size	17 in (432 mm) bore; 26 in (660 mm) stroke
Valve gear	Stephenson
Couplers	Johnston link-and-pin; AAR knuckle (1930s)
Tractive effort
Performance figures
Tractive effort	♠ 16,690 lbf (74.2 kN) @ 75%; ♥ 18,780 lbf (83.5 kN) @ 75%
Operators
Career
Operators	Cape Government Railways; Imperial Military Railways; Benguela Railway; South African Railways; Sudan Railways
Class	CGR 6th Class, SAR Class 6A
Number in class	50 CGR, 49 SAR
Numbers	CGR 161-201, 371-376, 660-662; (371-376 renumbered 571-576); IMR C501, C503, C509 & C510; Benguela 21; SAR 441-489
Delivered	1896–1897
First run	1896
Withdrawn	1973

The South African Railways Class 6A 4-6-0 of 1896 was a steam locomotive from the pre-Union era in the Cape of Good Hope.

In 1896 and 1897, the Cape Government Railways placed a second batch of fifty 6th Class 4-6-0 steam locomotives in service, forty-one on its Western System, six on its Midland System and three on its Eastern System. During the Second Boer War, four of them were transferred to the Imperial Military Railways on loan, and in 1907 one was sold to the Benguela Railway in Angola. In 1912, when the remaining forty-nine locomotives were assimilated into the South African Railways, they were renumbered and designated Class 6A.