South African Class 24 2-8-4

Specifications
Specifications
Configuration:;
• Whyte	2-8-4 (Berkshire)
• UIC	1′D2′h2
Driver	3rd coupled axle
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	30 in (762 mm)
Coupled dia.	51 in (1,295 mm)
Trailing dia.	30 in (762 mm)
Tender wheels	34 in (864 mm)
Minimum curve	300 ft (91 m)
Wheelbase	65 ft 3 in (19,888 mm)
• Engine	31 ft (9,449 mm)
• Coupled	13 ft 6 in (4,115 mm)
• Trailing	4 ft 6 in (1,372 mm)
• Tender	24 ft 7+1⁄4 in (7,499 mm)
• Tender bogie	8 ft 8 in (2,642 mm)
Length:;
• Over couplers	74 ft 9+1⁄4 in (22,790 mm)
Height	12 ft 10+7⁄8 in (3,934 mm)
Frame type	Cast
Axle load	11 LT 10 cwt (11,680 kg)
• Leading	8 LT (8,128 kg)
• 1st coupled	11 LT (11,180 kg)
• 2nd coupled	11 LT 10 cwt (11,680 kg)
• 3rd coupled	11 LT 9 cwt (11,630 kg)
• 4th coupled	11 LT 5 cwt (11,430 kg)
• Trailing	10 LT 2 cwt (10,260 kg) leading; 9 LT 12 cwt (9,754 kg) trailing
• Tender bogie	Bogie 1: 28 LT 1 cwt (28,500 kg); Bogie 2: 28 LT 10 cwt (28,960 kg)
• Tender axle	9 LT 10 cwt (9,652 kg)
Adhesive weight	45 LT 4 cwt (45,930 kg)
Loco weight	72 LT 18 cwt (74,070 kg)
Tender weight	56 LT 11 cwt (57,460 kg)
Total weight	129 LT 9 cwt (131,500 kg)
Tender type	MY (Buckeye 3-axle bogies)
Fuel type	Coal
Fuel capacity	9 LT (9.1 t)
Water cap.	4,520 imp gal (20,500 L)
Firebox:
• Type	Round-top
• Grate area	36 sq ft (3.3 m2)
Boiler:;
• Model	Watson Standard no. 1
• Pitch	8 ft (2,438 mm)
• Diameter	5 ft (1,524 mm)
• Tube plates	17 ft 9 in (5,410 mm) steel; 17 ft 8+5⁄8 in (5,401 mm) copper
• Small tubes	76: 2+1⁄2 in (64 mm)
• Large tubes	24: 5+1⁄2 in (140 mm)
Boiler pressure	200 psi (1,379 kPa)
Safety valve	Ross-pop
Heating surface:
• Firebox	123 sq ft (11.4 m2)
• Tubes	1,497 sq ft (139.1 m2)
• Arch tubes	16 sq ft (1.5 m2)
• Total surface	1,636 sq ft (152.0 m2)
Superheater:;
• Heating area	380 sq ft (35 m2)
Cylinders	Two
Cylinder size	19 in (483 mm) bore; 26 in (660 mm) stroke
Valve gear	Walschaerts
Valve type	Piston
Loco brake	Vacuum
Couplers	AAR knuckle

Type and origin
Type and origin
Power type	Steam
Designer	South African Railways; (Dr. M.M. Loubser)
Builder	North British Locomotive Company
Order number	L976
Serial number	26313-26412
Model	Class 24
Build date	1949-1950
Total produced	100

South African Class 24 2-8-4
South African Class 24 2-8-4
	3655 City of Cape Town leaving Monument station, 8 August 2010
Power type
Type and origin
Power type	Steam
Designer	South African Railways; (Dr. M.M. Loubser)
Builder	North British Locomotive Company
Order number	L976
Serial number	26313-26412
Model	Class 24
Build date	1949-1950
Total produced	100
Configuration:;
Specifications
Configuration:;
• Whyte	2-8-4 (Berkshire)
• UIC	1′D2′h2
Driver	3rd coupled axle
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	30 in (762 mm)
Coupled dia.	51 in (1,295 mm)
Trailing dia.	30 in (762 mm)
Tender wheels	34 in (864 mm)
Minimum curve	300 ft (91 m)
Wheelbase	65 ft 3 in (19,888 mm)
• Engine	31 ft (9,449 mm)
• Coupled	13 ft 6 in (4,115 mm)
• Trailing	4 ft 6 in (1,372 mm)
• Tender	24 ft 7+1⁄4 in (7,499 mm)
• Tender bogie	8 ft 8 in (2,642 mm)
Length:;
• Over couplers	74 ft 9+1⁄4 in (22,790 mm)
Height	12 ft 10+7⁄8 in (3,934 mm)
Frame type	Cast
Axle load	11 LT 10 cwt (11,680 kg)
• Leading	8 LT (8,128 kg)
• 1st coupled	11 LT (11,180 kg)
• 2nd coupled	11 LT 10 cwt (11,680 kg)
• 3rd coupled	11 LT 9 cwt (11,630 kg)
• 4th coupled	11 LT 5 cwt (11,430 kg)
• Trailing	10 LT 2 cwt (10,260 kg) leading; 9 LT 12 cwt (9,754 kg) trailing
• Tender bogie	Bogie 1: 28 LT 1 cwt (28,500 kg); Bogie 2: 28 LT 10 cwt (28,960 kg)
• Tender axle	9 LT 10 cwt (9,652 kg)
Adhesive weight	45 LT 4 cwt (45,930 kg)
Loco weight	72 LT 18 cwt (74,070 kg)
Tender weight	56 LT 11 cwt (57,460 kg)
Total weight	129 LT 9 cwt (131,500 kg)
Tender type	MY (Buckeye 3-axle bogies)
Fuel type	Coal
Fuel capacity	9 LT (9.1 t)
Water cap.	4,520 imp gal (20,500 L)
Firebox:
• Type	Round-top
• Grate area	36 sq ft (3.3 m2)
Boiler:;
• Model	Watson Standard no. 1
• Pitch	8 ft (2,438 mm)
• Diameter	5 ft (1,524 mm)
• Tube plates	17 ft 9 in (5,410 mm) steel; 17 ft 8+5⁄8 in (5,401 mm) copper
• Small tubes	76: 2+1⁄2 in (64 mm)
• Large tubes	24: 5+1⁄2 in (140 mm)
Boiler pressure	200 psi (1,379 kPa)
Safety valve	Ross-pop
Heating surface:
• Firebox	123 sq ft (11.4 m2)
• Tubes	1,497 sq ft (139.1 m2)
• Arch tubes	16 sq ft (1.5 m2)
• Total surface	1,636 sq ft (152.0 m2)
Superheater:;
• Heating area	380 sq ft (35 m2)
Cylinders	Two
Cylinder size	19 in (483 mm) bore; 26 in (660 mm) stroke
Valve gear	Walschaerts
Valve type	Piston
Loco brake	Vacuum
Couplers	AAR knuckle
Tractive effort
Performance figures
Tractive effort	27,600 lbf (123 kN) @ 75%
Operators
Career
Operators	South African Railways
Class	Class 24
Number in class	100
Numbers	3601-3700
Delivered	1949-1950
First run	1949
Withdrawn	1980s

The South African Railways Class 24 2-8-4 of 1949 is a steam locomotive.

In 1949 and 1950, the South African Railways placed 100 Class 24 branch line steam locomotives with a 2-8-4 Berkshire type wheel arrangement in service.