South African Class 6D 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 8+5⁄8 in (13,021 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 7+3⁄4 in (6,293 mm)
• Leading	5 ft 5+1⁄2 in (1,664 mm)
• Coupled	11 ft 4 in (3,454 mm)
• Tender	10 ft (3,048 mm)
Length:;
• Over couplers	51 ft 11+5⁄8 in (15,840 mm)
Height	12 ft 10 in (3,912 mm)
Frame type	Plate
Axle load	12 LT 10 cwt (12,700 kg)
• Leading	11 LT 4 cwt (11,380 kg)
• 1st coupled	11 LT 19 cwt (12,140 kg)
• 2nd coupled	12 LT 10 cwt (12,700 kg)
• 3rd coupled	12 LT 10 cwt (12,700 kg)
• Tender axle	10 LT 8 cwt (10,570 kg) average
Adhesive weight	36 LT 19 cwt (37,540 kg)
Loco weight	48 LT 3 cwt (48,920 kg)
Tender weight	31 LT 4 cwt (31,700 kg)
Total weight	79 LT 7 cwt (80,620 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
• Grate area	18 sq ft (1.7 m2)
Boiler:;
• Pitch	6 ft 8 in (2,032 mm)
• Diameter	4 ft 4 in (1,321 mm)
• Tube plates	11 ft 2+1⁄8 in (3,407 mm)
• Small tubes	185: 1+7⁄8 in (48 mm)
Boiler pressure	♠ 160 psi (1,103 kPa); ♥ 180 psi (1,241 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	107 sq ft (9.9 m2)
• Tubes	1,015 sq ft (94.3 m2)
• Total surface	1,122 sq ft (104.2 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; ♥ Reboilered locomotive
Power type	Steam
Designer	Cape Government Railways; (H.M. Beatty)
Builder	Neilson, Reid and Company
Serial number	5240–5272
Model	CGR 6th Class
Build date	1898
Total produced	33

CGR 6th Class 4-6-0 1898
South African Class 6D 4-6-0
CGR 6th Class 4-6-0 1898; South African Class 6D 4-6-0
	CGR Eastern System 6th Class no. 665, SAR Class 6D no. 594, Sydenham Loco, 29 December 1965
Power type
Type and origin
	♠ Original locomotive, as built; ♥ Reboilered locomotive
Power type	Steam
Designer	Cape Government Railways; (H.M. Beatty)
Builder	Neilson, Reid and Company
Serial number	5240–5272
Model	CGR 6th Class
Build date	1898
Total produced	33
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 8+5⁄8 in (13,021 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 7+3⁄4 in (6,293 mm)
• Leading	5 ft 5+1⁄2 in (1,664 mm)
• Coupled	11 ft 4 in (3,454 mm)
• Tender	10 ft (3,048 mm)
Length:;
• Over couplers	51 ft 11+5⁄8 in (15,840 mm)
Height	12 ft 10 in (3,912 mm)
Frame type	Plate
Axle load	12 LT 10 cwt (12,700 kg)
• Leading	11 LT 4 cwt (11,380 kg)
• 1st coupled	11 LT 19 cwt (12,140 kg)
• 2nd coupled	12 LT 10 cwt (12,700 kg)
• 3rd coupled	12 LT 10 cwt (12,700 kg)
• Tender axle	10 LT 8 cwt (10,570 kg) average
Adhesive weight	36 LT 19 cwt (37,540 kg)
Loco weight	48 LT 3 cwt (48,920 kg)
Tender weight	31 LT 4 cwt (31,700 kg)
Total weight	79 LT 7 cwt (80,620 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
• Grate area	18 sq ft (1.7 m2)
Boiler:;
• Pitch	6 ft 8 in (2,032 mm)
• Diameter	4 ft 4 in (1,321 mm)
• Tube plates	11 ft 2+1⁄8 in (3,407 mm)
• Small tubes	185: 1+7⁄8 in (48 mm)
Boiler pressure	♠ 160 psi (1,103 kPa); ♥ 180 psi (1,241 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	107 sq ft (9.9 m2)
• Tubes	1,015 sq ft (94.3 m2)
• Total surface	1,122 sq ft (104.2 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; South African Railways; Sudan Railways
Class	CGR 6th Class, SAR Class 6D
Number in class	33
Numbers	CGR 234-259, 585, 586 & 594, 665-668; SAR 565-597; Sudan M714-M715
Delivered	1898
First run	1898
Withdrawn	1973

The South African Railways Class 6D 4-6-0 of 1898 was a steam locomotive from the pre-Union era in the Cape of Good Hope.

In 1898, a fourth batch of 33 6th Class 4-6-0 steam locomotives were placed in service by the Cape Government Railways. In 1912, when these locomotives were assimilated into the South African Railways, they were renumbered and designated Class 6D.