This article is about one of two different Natal Government Railways locomotive types to be designated "Class C". For the other, see
South African Class H2 4-8-2T.
NGR Class C 4-10-2T
South African Class H 4-10-2T |
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NGR Class C no. 171 c. 1903, SAR Class H no. 253 |
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| Specifications |
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Configuration:
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| • Whyte | 4-10-2T (Reid Tenwheeler) |
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| • UIC | 2'E1'n2t |
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| Driver | 2nd coupled axle |
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| Gauge | 3 ft 6 in (1,067 mm) Cape gauge |
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| Leading dia. | 25+3⁄4 in (654 mm) |
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| Coupled dia. | 45 in (1,143 mm) |
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| Trailing dia. | 25+3⁄4 in (654 mm) |
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| Minimum curve | 300 ft (91 m) |
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| Wheelbase | 30 ft 6 in (9,296 mm) |
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| • Leading | 5 ft 4 in (1,626 mm) |
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| • Coupled | 16 ft 8 in (5,080 mm) |
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Length:
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| • Over couplers | 37 ft 6 in (11,430 mm) |
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| Height | 12 ft 6 in (3,810 mm) |
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| Frame type | Plate |
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| Axle load | 12 LT 5 cwt (12,450 kg) |
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| • Leading | 9 LT 17 cwt (10,010 kg) |
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| • 1st coupled | 10 LT 18 cwt (11,070 kg) |
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| • 2nd coupled | 12 LT 5 cwt (12,450 kg) |
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| • 3rd coupled | 10 LT 13 cwt (10,820 kg) |
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| • 4th coupled | 10 LT 10 cwt (10,670 kg) |
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| • 5th coupled | 10 LT 10 cwt (10,670 kg) |
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| • Trailing | 4 LT 4 cwt (4,267 kg) |
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| Adhesive weight | 54 LT 16 cwt (55,680 kg) |
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| Loco weight | 68 LT 17 cwt (69,950 kg) |
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| Fuel type | Coal |
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| Fuel capacity | 4 LT (4.1 t) |
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| Water cap. | 1,880 imp gal (8,550 L) |
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| Firebox: | |
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| • Type | Round-top |
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| • Grate area | 21.15 sq ft (1.965 m2) |
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Boiler:
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| • Pitch | 6 ft 10 in (2,083 mm) |
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| • Diameter | 4 ft 7+7⁄8 in (1,419 mm) |
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| • Tube plates | 10 ft 4 in (3,150 mm) |
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| • Small tubes | 287: 1+3⁄4 in (44 mm) |
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| Boiler pressure | 175 psi (1,207 kPa) |
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| Safety valve | Salter & Ramsbottom |
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| Heating surface: | |
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| • Firebox | 134.79 sq ft (12.522 m2) |
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| • Tubes | 1,358.71 sq ft (126.228 m2) |
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| • Total surface | 1,493.50 sq ft (138.751 m2) |
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| Cylinders | Two |
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| Cylinder size | 19 in (483 mm) bore
27 in (686 mm) stroke |
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| Valve gear | Allan |
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| Valve type | Richardson balanced slide |
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| Couplers | Johnston link-and-pin |
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| Career |
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| Operators | Natal Government Railways
South African Railways
Witbank Collieries |
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| Class | NGR Class C
SAR Class H |
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| Number in class | NGR 101, SAR 93 |
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| Numbers | NGR 149-249, SAR 232-324 |
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| Official name | Reid Tenwheeler |
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| Nicknames | Walloper |
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| Delivered | 1899–1903 |
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| First run | 1899 |
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| Withdrawn | 1977 |
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| 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.
