South African Class 6G 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	44 ft 11+3⁄4 in (13,710 mm)
• Axle spacing; (Asymmetrical)	1-2: 4 ft 9 in (1,448 mm); 2-3: 6 ft 7 in (2,007 mm)
• Engine	21 ft 2 in (6,452 mm)
• Leading	6 ft (1,829 mm)
• Coupled	11 ft 4 in (3,454 mm)
• Tender	14 ft 5 in (4,394 mm)
• Tender bogie	5 ft (1,524 mm)
Length:;
• Over couplers	51 ft 5+3⁄4 in (15,691 mm)
Height	12 ft 8 in (3,861 mm)
Frame type	Bar
Axle load	12 LT 15 cwt (12,950 kg)
• Leading	12 LT (12,190 kg)
• 1st coupled	11 LT 9 cwt 2 qtr (11,660 kg)
• 2nd coupled	12 LT 15 cwt (12,950 kg)
• 3rd coupled	12 LT 6 cwt (12,500 kg)
• Tender bogie	Bogie 1: 15 LT 16 cwt (16,050 kg); Bogie 2: 17 LT 6 cwt (17,580 kg)
• Tender axle	8 LT 13 cwt (8,789 kg)
Adhesive weight	36 LT 10 cwt 2 qtr (37,110 kg)
Loco weight	48 LT 10 cwt 2 qtr (49,300 kg)
Tender weight	33 LT 2 cwt (33,630 kg)
Total weight	81 LT 12 cwt 2 qtr (82,930 kg)
Tender type	WE (2-axle bogies); WE, WG permitted
Fuel type	Coal
Fuel capacity	5 LT (5.1 t)
Water cap.	2,800 imp gal (12,700 L)
Firebox:
• Type	Round-top
• Grate area	18.6 sq ft (1.73 m2)
Boiler:;
• Pitch	6 ft 11 in (2,108 mm)
• Diameter	4 ft 11 in (1,499 mm)
• Tube plates	11 ft 4+3⁄4 in (3,473 mm)
• Small tubes	195: 2 in (51 mm)
Boiler pressure	180 psi (1,241 kPa)
Safety valve	Ramsbottom 3 in (76 mm)
Heating surface:
• Firebox	111.5 sq ft (10.36 m2)
• Tubes	1,155 sq ft (107.3 m2)
• Total surface	1,266.5 sq ft (117.66 m2)
Cylinders	Two
Cylinder size	17+1⁄2 in (444 mm) bore; 26 in (660 mm) stroke
Valve gear	Stephenson
Valve type	Richardson balanced slide
Valve travel	5 in (127 mm)
Valve lap	1 in (25 mm)
Loco brake	Steam
Train brakes	Vacuum
Couplers	Johnston link-and-pin; AAR knuckle (1930s)

Type and origin
Type and origin
Power type	Steam
Designer	Cape Government Railways; Schenectady Locomotive Works
Builder	Schenectady Locomotive Works
Serial number	5646–5653
Model	CGR 6th Class
Build date	1901
Total produced	8

CGR 6th Class 4-6-0 1901 Schenectady
South African Class 6G 4-6-0
CGR 6th Class 4-6-0 1901 Schenectady; South African Class 6G 4-6-0
	Ex CGR 6th Class no. 263, SAR Class 6G no. 607
Power type
Type and origin
Power type	Steam
Designer	Cape Government Railways; Schenectady Locomotive Works
Builder	Schenectady Locomotive Works
Serial number	5646–5653
Model	CGR 6th Class
Build date	1901
Total produced	8
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	44 ft 11+3⁄4 in (13,710 mm)
• Axle spacing; (Asymmetrical)	1-2: 4 ft 9 in (1,448 mm); 2-3: 6 ft 7 in (2,007 mm)
• Engine	21 ft 2 in (6,452 mm)
• Leading	6 ft (1,829 mm)
• Coupled	11 ft 4 in (3,454 mm)
• Tender	14 ft 5 in (4,394 mm)
• Tender bogie	5 ft (1,524 mm)
Length:;
• Over couplers	51 ft 5+3⁄4 in (15,691 mm)
Height	12 ft 8 in (3,861 mm)
Frame type	Bar
Axle load	12 LT 15 cwt (12,950 kg)
• Leading	12 LT (12,190 kg)
• 1st coupled	11 LT 9 cwt 2 qtr (11,660 kg)
• 2nd coupled	12 LT 15 cwt (12,950 kg)
• 3rd coupled	12 LT 6 cwt (12,500 kg)
• Tender bogie	Bogie 1: 15 LT 16 cwt (16,050 kg); Bogie 2: 17 LT 6 cwt (17,580 kg)
• Tender axle	8 LT 13 cwt (8,789 kg)
Adhesive weight	36 LT 10 cwt 2 qtr (37,110 kg)
Loco weight	48 LT 10 cwt 2 qtr (49,300 kg)
Tender weight	33 LT 2 cwt (33,630 kg)
Total weight	81 LT 12 cwt 2 qtr (82,930 kg)
Tender type	WE (2-axle bogies); WE, WG permitted
Fuel type	Coal
Fuel capacity	5 LT (5.1 t)
Water cap.	2,800 imp gal (12,700 L)
Firebox:
• Type	Round-top
• Grate area	18.6 sq ft (1.73 m2)
Boiler:;
• Pitch	6 ft 11 in (2,108 mm)
• Diameter	4 ft 11 in (1,499 mm)
• Tube plates	11 ft 4+3⁄4 in (3,473 mm)
• Small tubes	195: 2 in (51 mm)
Boiler pressure	180 psi (1,241 kPa)
Safety valve	Ramsbottom 3 in (76 mm)
Heating surface:
• Firebox	111.5 sq ft (10.36 m2)
• Tubes	1,155 sq ft (107.3 m2)
• Total surface	1,266.5 sq ft (117.66 m2)
Cylinders	Two
Cylinder size	17+1⁄2 in (444 mm) bore; 26 in (660 mm) stroke
Valve gear	Stephenson
Valve type	Richardson balanced slide
Valve travel	5 in (127 mm)
Valve lap	1 in (25 mm)
Loco brake	Steam
Train brakes	Vacuum
Couplers	Johnston link-and-pin; AAR knuckle (1930s)
Tractive effort
Performance figures
Tractive effort	19,910 lbf (88.6 kN) @ 75%
Operators
Career
Operators	Cape Government Railways; South African Railways
Class	CGR 6th Class, SAR Class 6G
Number in class	8
Numbers	CGR 262-269; SAR 606-613
Delivered	1901
First run	1901
Withdrawn	1961
	The 2nd coupled axle had flangeless wheels

The South African Railways Class 6G 4-6-0 of 1901 was a steam locomotive from the pre-Union era in the Cape of Good Hope.

In 1901, eight 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 6G.