South African Class H 4-10-2T

NGR Class C 4-10-2T
South African Class H 4-10-2T
NGR Class C no. 171 c. 1903, SAR Class H no. 253
Type and origin
Power typeSteam
DesignerNatal Government Railways
(G.W. Reid)
BuilderDübs and Company
North British Locomotive Company
Serial numberDübs 3835, 4040-4064, 4118-4141, 4254-4278, 4310-4329
NBL 15723-15727
Build date1899-1903
Total produced102
RebuilderNatal Government Railways
South African Railways
Rebuild datec. 1910 onward
Number rebuilt98 to 4-8-2T (Mountain)
Specifications
Configuration:
 • Whyte4-10-2T (Reid Tenwheeler)
 • UIC2'E1'n2t
Driver2nd coupled axle
Gauge3 ft 6 in (1,067 mm) Cape gauge
Leading dia.25+34 in (654 mm)
Coupled dia.45 in (1,143 mm)
Trailing dia.25+34 in (654 mm)
Minimum curve300 ft (91 m)
Wheelbase30 ft 6 in (9,296 mm) ​
 • Leading5 ft 4 in (1,626 mm)
 • Coupled16 ft 8 in (5,080 mm)
Length:
 • Over couplers37 ft 6 in (11,430 mm)
Height12 ft 6 in (3,810 mm)
Frame typePlate
Axle load12 LT 5 cwt (12,450 kg) ​
 • Leading9 LT 17 cwt (10,010 kg)
 • 1st coupled10 LT 18 cwt (11,070 kg)
 • 2nd coupled12 LT 5 cwt (12,450 kg)
 • 3rd coupled10 LT 13 cwt (10,820 kg)
 • 4th coupled10 LT 10 cwt (10,670 kg)
 • 5th coupled10 LT 10 cwt (10,670 kg)
 • Trailing4 LT 4 cwt (4,267 kg)
Adhesive weight54 LT 16 cwt (55,680 kg)
Loco weight68 LT 17 cwt (69,950 kg)
Fuel typeCoal
Fuel capacity4 LT (4.1 t)
Water cap.1,880 imp gal (8,550 L)
Firebox:
 • TypeRound-top
 • Grate area21.15 sq ft (1.965 m2)
Boiler:
 • Pitch6 ft 10 in (2,083 mm)
 • Diameter4 ft 7+78 in (1,419 mm)
 • Tube plates10 ft 4 in (3,150 mm)
 • Small tubes287: 1+34 in (44 mm)
Boiler pressure175 psi (1,207 kPa)
Safety valveSalter & Ramsbottom
Heating surface:
 • Firebox134.79 sq ft (12.522 m2)
 • Tubes1,358.71 sq ft (126.228 m2)
 • Total surface1,493.50 sq ft (138.751 m2)
CylindersTwo
Cylinder size19 in (483 mm) bore
27 in (686 mm) stroke
Valve gearAllan
Valve typeRichardson balanced slide
CouplersJohnston link-and-pin
Performance figures
Tractive effort28,440 lbf (126.5 kN) @ 75%
Career
OperatorsNatal Government Railways
South African Railways
Witbank Collieries
ClassNGR Class C
SAR Class H
Number in classNGR 101, SAR 93
NumbersNGR 149-249, SAR 232-324
Official nameReid Tenwheeler
NicknamesWalloper
Delivered1899-1903
First run1899
Withdrawn1977
The leading and trailing coupled axles had flangeless wheels

The South African Railways Class H 4-10-2T, introduced in 1899, was a steam locomotive from the pre-Union era in the Colony of Natal.

Between 1899 and 1903, the Natal Government Railways placed 101 tank steam locomotives with a 4-10-2 wheel arrangement in service. In 1912, after the establishment of the South African Railways, 93 of these Class C Reid Tenwheelers survived unmodified and were designated Class H.[1][2][3]

  1. ^ Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer's Office, Pretoria, January 1912, pp. 7, 11, 13, 23-25 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000)
  2. ^ Espitalier, T.J.; Day, W.A.J. (1944). The Locomotive in South Africa - A Brief History of Railway Development. Chapter III - Natal Government Railways. (Continued). South African Railways and Harbours Magazine, June 1944. pp. 422-424.
  3. ^ Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 10–11, 31. ISBN 0869772112.