South African Class A 4-8-2T

Specifications
Specifications
Configuration:;
• Whyte	4-8-2T (Mountain)
• UIC	2'D1'n2t
Driver	2nd coupled axle
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	25+3⁄4 in (654 mm)
Coupled dia.	39 in (991 mm)
Trailing dia.	25+3⁄4 in (654 mm)
Wheelbase	24 ft 9 in (7,544 mm)
• Leading	5 ft (1,524 mm)
• Coupled	11 ft (3,353 mm)
Length:;
• Over couplers	32 ft 6+1⁄2 in (9,919 mm)
Height	♠ 12 ft 1⁄2 in (3,670 mm); ♥ 12 ft 2+1⁄2 in (3,721 mm)
Frame type	Plate
Axle load	♠ 8 LT 9 cwt (8,586 kg); ♥ 9 LT 4 cwt (9,348 kg)
• Leading	♠ 7 LT 18 cwt (8,027 kg); ♥ 7 LT (7,112 kg)
• 1st coupled	♠ 8 LT 2 cwt (8,230 kg); ♥ 8 LT 9 cwt (8,586 kg)
• 2nd coupled	♠ 8 LT 9 cwt (8,586 kg); ♥ 9 LT 4 cwt (9,348 kg)
• 3rd coupled	♠ 8 LT 2 cwt (8,230 kg); ♥ 8 LT 14 cwt (8,840 kg)
• 4th coupled	♠ 8 LT 2 cwt (8,230 kg); ♥ 8 LT 17 cwt (8,992 kg)
• Trailing	♠ 6 LT 10 cwt (6,604 kg); ♥ 6 LT 8 cwt (6,503 kg)
Adhesive weight	♠ 32 LT 15 cwt (33,280 kg); ♥ 35 LT 4 cwt (35,760 kg)
Loco weight	♠ 47 LT 3 cwt (47,910 kg); ♥ 48 LT 12 cwt (49,380 kg)
Fuel type	Coal
Fuel capacity	♠♥ 2 LT 5 cwt (2.3 t)
Water cap.	♠ 1,062 imp gal (4,830 L); ♥ 1,358 imp gal (6,170 L)
Firebox:
• Type	♠ Round-top; ♥ Belpaire
• Grate area	♠ 15.7 sq ft (1.46 m2); ♥ 23.5 sq ft (2.18 m2)
Boiler:;
• Pitch	♠ 6 ft 7+1⁄2 in (2,019 mm); ♥ 7 ft (2,134 mm)
• Diameter	♠ 3 ft 11 in (1,194 mm); ♥ 3 ft 10+3⁄4 in (1,187 mm)
• Tube plates	♠♥ 10 ft 10+1⁄8 in (3,305 mm)
• Small tubes	♠ 178: 1+3⁄4 in (44 mm); ♥ 187: 1+3⁄4 in (44 mm)
Boiler pressure	♠ 140 psi (965 kPa); ♥ 160 psi (1,103 kPa)
Safety valve	♠ Salter & Ramsbottom; ♥ Ramsbottom
Heating surface:
• Firebox	♠ 90.18 sq ft (8.378 m2); ♥ 62 sq ft (5.8 m2)
• Tubes	♠ 888.20 sq ft (82.516 m2); ♥ 929.5 sq ft (86.35 m2)
• Total surface	♠ 978.38 sq ft (90.894 m2); ♥ 991.5 sq ft (92.11 m2)
Cylinders	Two
Cylinder size	17 in (432 mm) bore; 21 in (533 mm) stroke
Valve gear	Stephenson
Valve type	Slide
Couplers	Johnston link-and-pin; AAR knuckle (1930s)

Type and origin
Type and origin
	♠ – Round-top firebox; ♥ – Belpaire firebox
Power type	Steam
Designer	Natal Government Railways; (William Milne)
Builder	Dübs and Company; South African Railways
Serial number	2446–2451, 2499–2504, 2604–2628, 2965–2967, 3317–3322, 3363–3368, 3477–3486, 3604–3605, 3556–3567, 3811–3834
Build date	1888–1915
Total produced	102
Rebuilder	South African Railways
Rebuild date	1926
Number rebuilt	21 to Class 17 4-8-0TT (Mastodon)

NGR Class D1 & D2 4-8-2T
South African Class A 4-8-2T
NGR Class D1 & D2 4-8-2T; South African Class A 4-8-2T
	SAR Class A Belpaire no. 196, ex NGR no 133, at Masons Mill, Pietermaritzburg, 10 December 2010
Power type
Type and origin
	♠ – Round-top firebox; ♥ – Belpaire firebox
Power type	Steam
Designer	Natal Government Railways; (William Milne)
Builder	Dübs and Company; South African Railways
Serial number	2446–2451, 2499–2504, 2604–2628, 2965–2967, 3317–3322, 3363–3368, 3477–3486, 3604–3605, 3556–3567, 3811–3834
Build date	1888–1915
Total produced	102
Rebuilder	South African Railways
Rebuild date	1926
Number rebuilt	21 to Class 17 4-8-0TT (Mastodon)
Configuration:;
Specifications
Configuration:;
• Whyte	4-8-2T (Mountain)
• UIC	2'D1'n2t
Driver	2nd coupled axle
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Leading dia.	25+3⁄4 in (654 mm)
Coupled dia.	39 in (991 mm)
Trailing dia.	25+3⁄4 in (654 mm)
Wheelbase	24 ft 9 in (7,544 mm)
• Leading	5 ft (1,524 mm)
• Coupled	11 ft (3,353 mm)
Length:;
• Over couplers	32 ft 6+1⁄2 in (9,919 mm)
Height	♠ 12 ft 1⁄2 in (3,670 mm); ♥ 12 ft 2+1⁄2 in (3,721 mm)
Frame type	Plate
Axle load	♠ 8 LT 9 cwt (8,586 kg); ♥ 9 LT 4 cwt (9,348 kg)
• Leading	♠ 7 LT 18 cwt (8,027 kg); ♥ 7 LT (7,112 kg)
• 1st coupled	♠ 8 LT 2 cwt (8,230 kg); ♥ 8 LT 9 cwt (8,586 kg)
• 2nd coupled	♠ 8 LT 9 cwt (8,586 kg); ♥ 9 LT 4 cwt (9,348 kg)
• 3rd coupled	♠ 8 LT 2 cwt (8,230 kg); ♥ 8 LT 14 cwt (8,840 kg)
• 4th coupled	♠ 8 LT 2 cwt (8,230 kg); ♥ 8 LT 17 cwt (8,992 kg)
• Trailing	♠ 6 LT 10 cwt (6,604 kg); ♥ 6 LT 8 cwt (6,503 kg)
Adhesive weight	♠ 32 LT 15 cwt (33,280 kg); ♥ 35 LT 4 cwt (35,760 kg)
Loco weight	♠ 47 LT 3 cwt (47,910 kg); ♥ 48 LT 12 cwt (49,380 kg)
Fuel type	Coal
Fuel capacity	♠♥ 2 LT 5 cwt (2.3 t)
Water cap.	♠ 1,062 imp gal (4,830 L); ♥ 1,358 imp gal (6,170 L)
Firebox:
• Type	♠ Round-top; ♥ Belpaire
• Grate area	♠ 15.7 sq ft (1.46 m2); ♥ 23.5 sq ft (2.18 m2)
Boiler:;
• Pitch	♠ 6 ft 7+1⁄2 in (2,019 mm); ♥ 7 ft (2,134 mm)
• Diameter	♠ 3 ft 11 in (1,194 mm); ♥ 3 ft 10+3⁄4 in (1,187 mm)
• Tube plates	♠♥ 10 ft 10+1⁄8 in (3,305 mm)
• Small tubes	♠ 178: 1+3⁄4 in (44 mm); ♥ 187: 1+3⁄4 in (44 mm)
Boiler pressure	♠ 140 psi (965 kPa); ♥ 160 psi (1,103 kPa)
Safety valve	♠ Salter & Ramsbottom; ♥ Ramsbottom
Heating surface:
• Firebox	♠ 90.18 sq ft (8.378 m2); ♥ 62 sq ft (5.8 m2)
• Tubes	♠ 888.20 sq ft (82.516 m2); ♥ 929.5 sq ft (86.35 m2)
• Total surface	♠ 978.38 sq ft (90.894 m2); ♥ 991.5 sq ft (92.11 m2)
Cylinders	Two
Cylinder size	17 in (432 mm) bore; 21 in (533 mm) stroke
Valve gear	Stephenson
Valve type	Slide
Couplers	Johnston link-and-pin; AAR knuckle (1930s)
Tractive effort
Performance figures
Tractive effort	♠ 16,340 lbf (72.7 kN) @ 75%; ♥ 18,660 lbf (83.0 kN) @ 75%
Factor of adh.	3.99
Operators
Career
Operators	Natal Government Railways; South African Railways
Class	♠ NGR Class D1, SAR Class A; ♥ NGR Class D2, SAR Class A Belpaire
Number in class	102
Numbers	NGR 49–148; SAR 97–196, 332–333
Delivered	1888–1915
First run	1888
Withdrawn	1962
Disposition	5 preserved, remainder scrapped
	The leading coupled axle had flangeless wheels

The South African Railways Class A 4-8-2T of 1888 is a steam locomotive class from the pre-Union era in the Colony of Natal.

In 1888, the Natal Government Railways placed the first five of its eventual one hundred Class D 4-8-2T steam locomotives in service. The last was delivered in 1899. They were the first locomotives in the world to be built with a 4-8-2 wheel arrangement, later to become known as the Mountain type. In 1912, when these locomotives were assimilated into the South African Railways, they were renumbered and designated Class A. In 1915, another two Class A locomotives were built from spare parts.