South African Class 6B 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	33+1⁄2 in (851 mm) as built; 34 in (864 mm) retyred
Wheelbase	46 ft 6+1⁄4 in (14,180 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	16 ft 1 in (4,902 mm)
• Tender bogie	4 ft 7 in (1,397 mm)
Length:;
• Over couplers	53 ft 9+3⁄4 in (16,402 mm)
Height	♠ 12 ft 10 in (3,912 mm); ♥ 12 ft 10+3⁄8 in (3,921 mm)
Frame type	Plate
Axle load	♠ 12 LT 3 cwt (12,340 kg); ♥ 13 LT 8 cwt (13,620 kg)
• Leading	♠ 11 LT 17 cwt (12,040 kg); ♥ 10 LT 17 cwt 2 qtr (11,050 kg)
• Coupled	♥ 13 LT 8 cwt (13,620 kg)
• 1st coupled	♠ 10 LT 7 cwt (10,520 kg)
• 2nd coupled	♠ 11 LT 18 cwt (12,090 kg)
• 3rd coupled	♠ 12 LT 3 cwt (12,340 kg)
• Tender bogie	Bogie 1: 16 LT 12 cwt (16,870 kg); Bogie 2: 17 LT 13 cwt (17,930 kg)
• Tender axle	8 LT 16 cwt 2 qtr (8,967 kg)
Adhesive weight	♠ 34 LT 8 cwt (34,950 kg); ♥ 40 LT 4 cwt (40,850 kg)
Loco weight	♠ 46 LT 5 cwt (46,990 kg); ♥ 51 LT 1 cwt 2 qtr (51,890 kg)
Tender weight	34 LT 5 cwt (34,800 kg)
Total weight	♠ 80 LT 10 cwt (81,790 kg); ♥ 85 LT 6 cwt 2 qtr (86,690 kg)
Tender type	XC1 (2-axle bogies); XC, XC1, XD, XE, XE1, XF, XF1, XF2, XJ, XM, XM1, XM2, XM3, XM4 permitted
Fuel type	Coal
Fuel capacity	5 LT 10 cwt (5.6 t)
Water cap.	2,600 imp gal (11,820 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)
• 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; Neilson and Company; Neilson, Reid and Company
Serial number	Dübs 3467–3468, 3472–3474; Neilson 5120–5125, 5128–5129, 5131–5159; Neilson, Reid 5273–5279, 5319–5324
Model	CGR 6th Class
Build date	1897–1898
Total produced	55

CGR 6th Class 4-6-0 1897
South African Class 6B 4-6-0
CGR 6th Class 4-6-0 1897; South African Class 6B 4-6-0
	CGR 6th Class no. 206, SAR Class 6B no. 494, 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; Neilson and Company; Neilson, Reid and Company
Serial number	Dübs 3467–3468, 3472–3474; Neilson 5120–5125, 5128–5129, 5131–5159; Neilson, Reid 5273–5279, 5319–5324
Model	CGR 6th Class
Build date	1897–1898
Total produced	55
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) as built; 34 in (864 mm) retyred
Wheelbase	46 ft 6+1⁄4 in (14,180 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	16 ft 1 in (4,902 mm)
• Tender bogie	4 ft 7 in (1,397 mm)
Length:;
• Over couplers	53 ft 9+3⁄4 in (16,402 mm)
Height	♠ 12 ft 10 in (3,912 mm); ♥ 12 ft 10+3⁄8 in (3,921 mm)
Frame type	Plate
Axle load	♠ 12 LT 3 cwt (12,340 kg); ♥ 13 LT 8 cwt (13,620 kg)
• Leading	♠ 11 LT 17 cwt (12,040 kg); ♥ 10 LT 17 cwt 2 qtr (11,050 kg)
• Coupled	♥ 13 LT 8 cwt (13,620 kg)
• 1st coupled	♠ 10 LT 7 cwt (10,520 kg)
• 2nd coupled	♠ 11 LT 18 cwt (12,090 kg)
• 3rd coupled	♠ 12 LT 3 cwt (12,340 kg)
• Tender bogie	Bogie 1: 16 LT 12 cwt (16,870 kg); Bogie 2: 17 LT 13 cwt (17,930 kg)
• Tender axle	8 LT 16 cwt 2 qtr (8,967 kg)
Adhesive weight	♠ 34 LT 8 cwt (34,950 kg); ♥ 40 LT 4 cwt (40,850 kg)
Loco weight	♠ 46 LT 5 cwt (46,990 kg); ♥ 51 LT 1 cwt 2 qtr (51,890 kg)
Tender weight	34 LT 5 cwt (34,800 kg)
Total weight	♠ 80 LT 10 cwt (81,790 kg); ♥ 85 LT 6 cwt 2 qtr (86,690 kg)
Tender type	XC1 (2-axle bogies); XC, XC1, XD, XE, XE1, XF, XF1, XF2, XJ, XM, XM1, XM2, XM3, XM4 permitted
Fuel type	Coal
Fuel capacity	5 LT 10 cwt (5.6 t)
Water cap.	2,600 imp gal (11,820 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)
• 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 6B
Number in class	51
Numbers	CGR 202–233, 577–584, 587–593, 595–600, 663–664; IMR C502, C504–C508, C512; Benguela 22–25; SAR 490–540; Sudan M711-M712
Delivered	1897–1898
First run	1897
Withdrawn	1973
Disposition	Four preserved (490, 496, 500, 536), remainder scrapped

The South African Railways Class 6B 4-6-0 of 1897 was a steam locomotive from the pre-Union era in the Cape of Good Hope.

In 1897 and 1898, the Cape Government Railways placed a third batch of 55 6th Class 4-6-0 steam locomotives in service, 32 on its Western System, 21 on its Midland System and two on its Eastern System. During the Second Boer War, seven were transferred to the Imperial Military Railways on loan, and in 1907 four were sold to the Benguela Railway in Angola. In 1912, when the remaining 51 locomotives were assimilated into the South African Railways, they were renumbered and designated Class 6B. During the Second World War, two of them were sold to the Sudan Railways.