South African Class H2 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 (650 mm)
Coupled dia.	45 in (1,100 mm)
Trailing dia.	25+3⁄4 in (650 mm)
Minimum curve	300 ft (91 m) radius
Wheelbase	30 ft 6 in (9,296 mm)
• Leading	5 ft 4 in (1,626 mm)
• Coupled	12 ft 6 in (3,810 mm)
Length:;
• Over couplers	37 ft 6 in (11,430 mm)
Height	12 ft 6 in (3,810 mm)
Axle load	13 LT (13,210 kg)
• Leading	10 LT 4 cwt 2 qtr (10,390 kg)
• Coupled	13 LT (13,210 kg)
• Trailing	6 LT (6,096 kg)
Adhesive weight	52 LT (52,830 kg)
Loco weight	68 LT (69,090 kg)
Fuel type	Coal
Fuel capacity	4 LT (4.1 t)
Water cap.	1,880 imp gal (8,550 L)
Firebox:
• Type	Round-top
• Grate area	21 sq ft (2.0 m2)
Boiler:;
• Pitch	6 ft 10 in (2,083 mm)
• Diameter	4 ft 7+7⁄8 in (1,419 mm)
• Tube plates	10 ft 4 in (3,150 mm)
• Small tubes	287: 1+3⁄4 in (44 mm)
Boiler pressure	175 psi (1,207 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	135 sq ft (12.5 m2)
• Tubes	1,359 sq ft (126.3 m2)
• Total surface	1,494 sq ft (138.8 m2)
Cylinders	Two
Cylinder size	19 in (483 mm) bore; 27 in (686 mm) stroke
Valve gear	Allan
Couplers	Johnston link-and-pin; AAR knuckle (1930s)

Type and origin
Type and origin
Power type	Steam
Designer	Natal Government Railways; (G.W. Reid)
Builder	Dübs and Company; Natal Government Railways; South African Railways
Serial number	Dübs 4047, 4060, 4063, 4117, 4271, 4273, 4315, 4325
Model	NGR Reid Tenwheeler
Build date	c. 1909-1912
Total produced	8

NGR Class C 4-8-2T
South African Class H2 4-8-2T
NGR Class C 4-8-2T; South African Class H2 4-8-2T
	Class H2 no. 329 at Masons Mill, 29 March 1979; Ex NGR Class C 4-10-2T no. 157; Ex SAR Class H 4-10-2T no. 240
Power type
Type and origin
Power type	Steam
Designer	Natal Government Railways; (G.W. Reid)
Builder	Dübs and Company; Natal Government Railways; South African Railways
Serial number	Dübs 4047, 4060, 4063, 4117, 4271, 4273, 4315, 4325
Model	NGR Reid Tenwheeler
Build date	c. 1909-1912
Total produced	8
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 (650 mm)
Coupled dia.	45 in (1,100 mm)
Trailing dia.	25+3⁄4 in (650 mm)
Minimum curve	300 ft (91 m) radius
Wheelbase	30 ft 6 in (9,296 mm)
• Leading	5 ft 4 in (1,626 mm)
• Coupled	12 ft 6 in (3,810 mm)
Length:;
• Over couplers	37 ft 6 in (11,430 mm)
Height	12 ft 6 in (3,810 mm)
Axle load	13 LT (13,210 kg)
• Leading	10 LT 4 cwt 2 qtr (10,390 kg)
• Coupled	13 LT (13,210 kg)
• Trailing	6 LT (6,096 kg)
Adhesive weight	52 LT (52,830 kg)
Loco weight	68 LT (69,090 kg)
Fuel type	Coal
Fuel capacity	4 LT (4.1 t)
Water cap.	1,880 imp gal (8,550 L)
Firebox:
• Type	Round-top
• Grate area	21 sq ft (2.0 m2)
Boiler:;
• Pitch	6 ft 10 in (2,083 mm)
• Diameter	4 ft 7+7⁄8 in (1,419 mm)
• Tube plates	10 ft 4 in (3,150 mm)
• Small tubes	287: 1+3⁄4 in (44 mm)
Boiler pressure	175 psi (1,207 kPa)
Safety valve	Ramsbottom
Heating surface:
• Firebox	135 sq ft (12.5 m2)
• Tubes	1,359 sq ft (126.3 m2)
• Total surface	1,494 sq ft (138.8 m2)
Cylinders	Two
Cylinder size	19 in (483 mm) bore; 27 in (686 mm) stroke
Valve gear	Allan
Couplers	Johnston link-and-pin; AAR knuckle (1930s)
Tractive effort
Performance figures
Tractive effort	28,430 lbf (126.5 kN) @ 75%
Operators
Career
Operators	Natal Government Railways; South African Railways
Class	NGR Class C, SAR Class H2
Number in class	8
Numbers	NGR 170, 173, 175, 217 & 240; SAR 227-231, 329-331
Delivered	c. 1909-1912
First run	1909
Withdrawn	1977
	The leading coupled axle had flangeless wheels

The South African Railways Class H2 4-8-2T of 1909 was a steam locomotive from the pre-Union era in the Colony of Natal.

Between 1899 and 1903, the Natal Government Railways placed 101 4-10-2 tank steam locomotives in service. By 1910, five of them had been converted to a 4-8-2T wheel arrangement and in 1912, when the South African Railways classification and renumbering of locomotives took place, these five were designated Class H2.^[1]^[2]^[3]

^ Holland, D.F. (1971). Steam Locomotives of the South African Railways. Vol. 1: 1859–1910 (1st ed.). Newton Abbott, England: David & Charles. pp. 92–95, 123–124. ISBN 978-0-7153-5382-0.
^ Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer's Office, Pretoria, January 1912, pp. 7, 11, 13, 23 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000)
^ Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 10–11, 31–33. ISBN 0869772112.

[Holland_1-1] Holland, D.F. (1971). Steam Locomotives of the South African Railways. Vol. 1: 1859–1910 (1st ed.). Newton Abbott, England: David & Charles. pp. 92–95, 123–124. ISBN 978-0-7153-5382-0.

[SAR_Renumber-2] Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer's Office, Pretoria, January 1912, pp. 7, 11, 13, 23 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000)

[Paxton-Bourne-3] Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 10–11, 31–33. ISBN 0869772112.

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