South African Class 25 4-8-4

Specifications
Specifications
Configuration:;
• Whyte	4-8-4
• UIC	2′D2′h2
Driver	2nd coupled axle
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	30 in (762 mm)
Coupled dia.	60 in (1,524 mm)
Trailing dia.	30 in (762 mm)
Tender wheels	34 in (864 mm)
Minimum curve	275 ft (84 m)
Wheelbase	95 ft 1+11⁄16 in (28,999 mm)
• Engine	38 ft (11,582 mm)
• Leading	6 ft 10 in (2,083 mm)
• Coupled	15 ft 9 in (4,801 mm)
• Trailing	5 ft 6 in (1,676 mm)
• Tender	45 ft 10 in (13,970 mm)
• Tender bogie	10 ft (3,048 mm)
Length:;
• Over couplers	107 ft 6+1⁄16 in (32,768 mm)
Height	13 ft (3,962 mm)
Frame type	Cast
Axle load	19 LT 6 cwt (19,610 kg)
• Leading	21 LT 1 cwt (21,390 kg)
• 1st coupled	19 LT 4 cwt (19,510 kg)
• 2nd coupled	19 LT 5 cwt (19,560 kg)
• 3rd coupled	19 LT 6 cwt (19,610 kg)
• 4th coupled	19 LT 3 cwt (19,460 kg)
• Trailing	22 LT 10 cwt (22,860 kg)
• Tender bogie	Bogie 1: 57 LT 4 cwt (58,120 kg); Bogie 2: 56 LT 14 cwt (57,610 kg)
• Tender axle	19 LT 1 cwt 2 qtr (19,380 kg)
Adhesive weight	76 LT 18 cwt (78,130 kg)
Loco weight	120 LT 9 cwt (122,400 kg)
Tender weight	113 LT 18 cwt (115,700 kg)
Total weight	234 LT 7 cwt (238,100 kg)
Tender type	CZ (3-axle bogies)
Fuel type	Coal
Fuel capacity	19 LT (19.3 t)
Water cap.	4,400 imp gal (20,000 L) main tank; 600 imp gal (2,730 L) condensate
Firebox:
• Type	Round-top
• Grate area	70 sq ft (6.5 m2)
Boiler:;
• Type	Domeless
• Pitch	9 ft 1+5⁄8 in (2,784 mm)
• Diameter	6 ft 4+1⁄8 in (1,934 mm)
• Tube plates	19 ft (5,791 mm)
• Small tubes	158: 2+1⁄2 in (64 mm)
• Large tubes	40: 5+1⁄2 in (140 mm)
Boiler pressure	225 psi (1,551 kPa)
Safety valve	Ross-pop
Heating surface:
• Firebox	294 sq ft (27.3 m2)
• Tubes	3,059 sq ft (284.2 m2)
• Arch tubes	37 sq ft (3.4 m2)
• Total surface	3,390 sq ft (315 m2)
Superheater:;
• Type	Melesco
• Heating area	630 sq ft (59 m2)
Cylinders	Two
Cylinder size	24 in (610 mm) bore; 28 in (711 mm) stroke
Valve gear	Walschaerts
Valve type	Piston
Valve travel	7+3⁄8 in (187 mm)
Loco brake	Vacuum
Couplers	AAR knuckle

Type and origin
Type and origin
Power type	Steam
Designer	South African Railways; (L.C. Grubb); Henschel & Son
Builder	Henschel & Son; North British Locomotive Company
Serial number	Henschel 28730; NBL 27312-27400
Model	Class 25
Build date	1953
Total produced	90
Rebuilder	South African Railways
Rebuild date	1973-1980
Number rebuilt	87 to Class 25NC

South African Class 25 4-8-4
South African Class 25 4-8-4
	3511 at Hartswater, 24 April 1981
Power type
Type and origin
Power type	Steam
Designer	South African Railways; (L.C. Grubb); Henschel & Son
Builder	Henschel & Son; North British Locomotive Company
Serial number	Henschel 28730; NBL 27312-27400
Model	Class 25
Build date	1953
Total produced	90
Rebuilder	South African Railways
Rebuild date	1973-1980
Number rebuilt	87 to Class 25NC
Configuration:;
Specifications
Configuration:;
• Whyte	4-8-4
• UIC	2′D2′h2
Driver	2nd coupled axle
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	30 in (762 mm)
Coupled dia.	60 in (1,524 mm)
Trailing dia.	30 in (762 mm)
Tender wheels	34 in (864 mm)
Minimum curve	275 ft (84 m)
Wheelbase	95 ft 1+11⁄16 in (28,999 mm)
• Engine	38 ft (11,582 mm)
• Leading	6 ft 10 in (2,083 mm)
• Coupled	15 ft 9 in (4,801 mm)
• Trailing	5 ft 6 in (1,676 mm)
• Tender	45 ft 10 in (13,970 mm)
• Tender bogie	10 ft (3,048 mm)
Length:;
• Over couplers	107 ft 6+1⁄16 in (32,768 mm)
Height	13 ft (3,962 mm)
Frame type	Cast
Axle load	19 LT 6 cwt (19,610 kg)
• Leading	21 LT 1 cwt (21,390 kg)
• 1st coupled	19 LT 4 cwt (19,510 kg)
• 2nd coupled	19 LT 5 cwt (19,560 kg)
• 3rd coupled	19 LT 6 cwt (19,610 kg)
• 4th coupled	19 LT 3 cwt (19,460 kg)
• Trailing	22 LT 10 cwt (22,860 kg)
• Tender bogie	Bogie 1: 57 LT 4 cwt (58,120 kg); Bogie 2: 56 LT 14 cwt (57,610 kg)
• Tender axle	19 LT 1 cwt 2 qtr (19,380 kg)
Adhesive weight	76 LT 18 cwt (78,130 kg)
Loco weight	120 LT 9 cwt (122,400 kg)
Tender weight	113 LT 18 cwt (115,700 kg)
Total weight	234 LT 7 cwt (238,100 kg)
Tender type	CZ (3-axle bogies)
Fuel type	Coal
Fuel capacity	19 LT (19.3 t)
Water cap.	4,400 imp gal (20,000 L) main tank; 600 imp gal (2,730 L) condensate
Firebox:
• Type	Round-top
• Grate area	70 sq ft (6.5 m2)
Boiler:;
• Type	Domeless
• Pitch	9 ft 1+5⁄8 in (2,784 mm)
• Diameter	6 ft 4+1⁄8 in (1,934 mm)
• Tube plates	19 ft (5,791 mm)
• Small tubes	158: 2+1⁄2 in (64 mm)
• Large tubes	40: 5+1⁄2 in (140 mm)
Boiler pressure	225 psi (1,551 kPa)
Safety valve	Ross-pop
Heating surface:
• Firebox	294 sq ft (27.3 m2)
• Tubes	3,059 sq ft (284.2 m2)
• Arch tubes	37 sq ft (3.4 m2)
• Total surface	3,390 sq ft (315 m2)
Superheater:;
• Type	Melesco
• Heating area	630 sq ft (59 m2)
Cylinders	Two
Cylinder size	24 in (610 mm) bore; 28 in (711 mm) stroke
Valve gear	Walschaerts
Valve type	Piston
Valve travel	7+3⁄8 in (187 mm)
Loco brake	Vacuum
Couplers	AAR knuckle
Tractive effort
Performance figures
Tractive effort	45,360 lbf (201.8 kN) @ 75%
Operators
Career
Operators	South African Railways
Class	Class 25
Number in class	90
Numbers	3451-3540
Official name	Frieda (3511)
Nicknames	Condenser
Delivered	1953-1954
First run	1953
Preserved	Three preserved, remainder scrapped

The South African Railways Class 25 4-8-4 of 1953 was a condensing steam locomotive.

Between 1953 and 1955, the South African Railways placed ninety Class 25 condensing steam locomotives with a 4-8-4 Northern type wheel arrangement in service. The Class 25NC which was placed in service at the same time was a non-condensing version of the Class 25 condenser.