South African Class GF 4-6-2+2-6-4

Specifications
Specifications
Configuration:;
• Whyte	4-6-2+2-6-4 (Double Pacific)
• UIC	2'C1'+1'C2'h4t
Driver	2nd & 5th coupled axles
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	30 in (762 mm)
Coupled dia.	54 in (1,372 mm)
Trailing dia.	30 in (762 mm)
Wheelbase	69 ft 9 in (21,260 mm)
• Engine	23 ft 7 in (7,188 mm) each
• Leading	6 ft 2 in (1,880 mm) each
• Coupled	9 ft 6 in (2,896 mm) each
Pivot centres	33 ft 2 in (10,109 mm)
Length:;
• Over couplers	77 ft 1 in (23,495 mm)
Height	12 ft 10 in (3,912 mm)
Frame type	Bar
Axle load	♠ 14 LT (14,220 kg); ♥ 14 LT 4 cwt (14,430 kg)
• Leading	♠ 18 LT 1 cwt (18,340 kg) front; 19 LT 3 cwt (19,460 kg) rear; ♥ 17 LT 7 cwt (17,630 kg) front; 19 LT 3 cwt (19,460 kg) rear
• 1st coupled	♠ 13 LT 13 cwt (13,870 kg); ♥ 13 LT 19 cwt (14,170 kg)
• 2nd coupled	♠ 13 LT 9 cwt (13,670 kg); ♥ 13 LT 15 cwt (13,970 kg)
• 3rd coupled	♠ 13 LT 13 cwt (13,870 kg); ♥ 13 LT 19 cwt (14,170 kg)
• 4th coupled	♠ 13 LT 19 cwt (14,170 kg); ♥ 14 LT 4 cwt (14,430 kg)
• 5th coupled	♠ 13 LT 16 cwt (14,020 kg); ♥ 13 LT 19 cwt (14,170 kg)
• 6th coupled	♠ 14 LT (14,220 kg); ♥ 14 LT 4 cwt (14,430 kg)
• Trailing	♠ 11 LT 7 cwt (11,530 kg) front; 12 LT 4 cwt (12,400 kg) rear; ♥ 12 LT 3 cwt (12,340 kg) front; 12 LT 8 cwt (12,600 kg) rear
Adhesive weight	♠ 82 LT 10 cwt (83,820 kg); ♥ 84 LT (85,350 kg)
Loco weight	♠ 143 LT 5 cwt (145,500 kg); ♥ 145 LT 11 cwt (147,900 kg)
Fuel type	Coal
Fuel capacity	10 LT (10.2 t) (light rail); 11 LT 10 cwt (11.7 t) (Johannesburg-Mafeking)
Water cap.	3,000 imp gal (13,600 L) front; 1,000 imp gal (4,550 L) rear
Firebox:
• Type	Round-top
• Grate area	44 sq ft (4.1 m2)
Boiler:;
• Pitch	7 ft 9 in (2,362 mm)
• Diameter	6 ft 2+3⁄4 in (1,899 mm)
• Tube plates	11 ft 8+5⁄8 in (3,572 mm)
• Small tubes	234: 2 in (51 mm)
• Large tubes	36: 5+1⁄2 in (140 mm)
Boiler pressure	185 psi (1,276 kPa)
Safety valve	Pop
Heating surface:
• Firebox	176 sq ft (16.4 m2)
• Tubes	2,043 sq ft (189.8 m2)
• Arch tubes	23 sq ft (2.1 m2)
• Total surface	2,242 sq ft (208.3 m2)
Superheater:;
• Heating area	473 sq ft (43.9 m2)
Cylinders	Four
Cylinder size	16 in (406 mm) bore; 26 in (660 mm) stroke
Valve gear	Heusinger
Valve type	Piston
Couplers	AAR knuckle

Type and origin
Type and origin
	♠ Locomotives built by Hanomag; ♥ Locomotives built by Henschel & Maffei
Power type	Steam
Designer	South African Railways; (Col F.R. Collins DSO)
Builder	Hanomag; Henschel and Son; Maffei
Serial number	Hanomag 10512-10548; Henschel 21053-21070; Maffei 5748-5757
Model	Class GF
Build date	1927–1928
Total produced	65

South African Class GF 4-6-2+2-6-4
South African Class GF 4-6-2+2-6-4
	No. 2427 at Mason's Mill, 6 July 1962
Power type
Type and origin
	♠ Locomotives built by Hanomag; ♥ Locomotives built by Henschel & Maffei
Power type	Steam
Designer	South African Railways; (Col F.R. Collins DSO)
Builder	Hanomag; Henschel and Son; Maffei
Serial number	Hanomag 10512-10548; Henschel 21053-21070; Maffei 5748-5757
Model	Class GF
Build date	1927–1928
Total produced	65
Configuration:;
Specifications
Configuration:;
• Whyte	4-6-2+2-6-4 (Double Pacific)
• UIC	2'C1'+1'C2'h4t
Driver	2nd & 5th coupled axles
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	30 in (762 mm)
Coupled dia.	54 in (1,372 mm)
Trailing dia.	30 in (762 mm)
Wheelbase	69 ft 9 in (21,260 mm)
• Engine	23 ft 7 in (7,188 mm) each
• Leading	6 ft 2 in (1,880 mm) each
• Coupled	9 ft 6 in (2,896 mm) each
Pivot centres	33 ft 2 in (10,109 mm)
Length:;
• Over couplers	77 ft 1 in (23,495 mm)
Height	12 ft 10 in (3,912 mm)
Frame type	Bar
Axle load	♠ 14 LT (14,220 kg); ♥ 14 LT 4 cwt (14,430 kg)
• Leading	♠ 18 LT 1 cwt (18,340 kg) front; 19 LT 3 cwt (19,460 kg) rear; ♥ 17 LT 7 cwt (17,630 kg) front; 19 LT 3 cwt (19,460 kg) rear
• 1st coupled	♠ 13 LT 13 cwt (13,870 kg); ♥ 13 LT 19 cwt (14,170 kg)
• 2nd coupled	♠ 13 LT 9 cwt (13,670 kg); ♥ 13 LT 15 cwt (13,970 kg)
• 3rd coupled	♠ 13 LT 13 cwt (13,870 kg); ♥ 13 LT 19 cwt (14,170 kg)
• 4th coupled	♠ 13 LT 19 cwt (14,170 kg); ♥ 14 LT 4 cwt (14,430 kg)
• 5th coupled	♠ 13 LT 16 cwt (14,020 kg); ♥ 13 LT 19 cwt (14,170 kg)
• 6th coupled	♠ 14 LT (14,220 kg); ♥ 14 LT 4 cwt (14,430 kg)
• Trailing	♠ 11 LT 7 cwt (11,530 kg) front; 12 LT 4 cwt (12,400 kg) rear; ♥ 12 LT 3 cwt (12,340 kg) front; 12 LT 8 cwt (12,600 kg) rear
Adhesive weight	♠ 82 LT 10 cwt (83,820 kg); ♥ 84 LT (85,350 kg)
Loco weight	♠ 143 LT 5 cwt (145,500 kg); ♥ 145 LT 11 cwt (147,900 kg)
Fuel type	Coal
Fuel capacity	10 LT (10.2 t) (light rail); 11 LT 10 cwt (11.7 t) (Johannesburg-Mafeking)
Water cap.	3,000 imp gal (13,600 L) front; 1,000 imp gal (4,550 L) rear
Firebox:
• Type	Round-top
• Grate area	44 sq ft (4.1 m2)
Boiler:;
• Pitch	7 ft 9 in (2,362 mm)
• Diameter	6 ft 2+3⁄4 in (1,899 mm)
• Tube plates	11 ft 8+5⁄8 in (3,572 mm)
• Small tubes	234: 2 in (51 mm)
• Large tubes	36: 5+1⁄2 in (140 mm)
Boiler pressure	185 psi (1,276 kPa)
Safety valve	Pop
Heating surface:
• Firebox	176 sq ft (16.4 m2)
• Tubes	2,043 sq ft (189.8 m2)
• Arch tubes	23 sq ft (2.1 m2)
• Total surface	2,242 sq ft (208.3 m2)
Superheater:;
• Heating area	473 sq ft (43.9 m2)
Cylinders	Four
Cylinder size	16 in (406 mm) bore; 26 in (660 mm) stroke
Valve gear	Heusinger
Valve type	Piston
Couplers	AAR knuckle
Tractive effort
Performance figures
Tractive effort	34,200 lbf (152 kN) @ 75%
Operators
Career
Operators	South African Railways
Class	Class GF
Number in class	65
Numbers	2370–2434
Delivered	1927–1928
First run	1927
Withdrawn	1979

The South African Railways Class GF 4-6-2+2-6-4 of 1927 was an articulated steam locomotive.

In 1927, the South African Railways placed 37 Class GF Garratt steam locomotives with a 4-6-2+2-6-4 Double Pacific type wheel arrangement in service. A further 28 locomotives were delivered from two manufacturers in 1928.