NGR Class N 4-6-2T 1911
South African Class NG4 4-6-2T |
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No. NG16, restored at Sandstone Estates, 4 May 2013 |
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| Specifications |
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Configuration:
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| • Whyte | 4-6-2T |
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| • UIC | 2'C1'n2t |
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| Driver | 2nd coupled axle |
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| Gauge | 2 ft (610 mm) narrow |
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| Leading dia. | 18 in (457 mm) |
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| Coupled dia. | 30 in (762 mm) |
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| Trailing dia. | 21 in (533 mm) |
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| Wheelbase | 17 ft 9 in (5,410 mm) |
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| • Leading | 3 ft 6 in (1,067 mm) |
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| • Coupled | 5 ft 9 in (1,753 mm) |
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Length:
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| • Over couplers | 24 ft 11 in (7,595 mm) |
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| Height | 9 ft 4+1⁄2 in (2,858 mm) |
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| Frame type | Plate |
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| Axle load | 6 LT 3 cwt (6,249 kg) |
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| • Leading | 6 LT 19 cwt (7,062 kg) |
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| • 1st coupled | 6 LT (6,096 kg) |
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| • 2nd coupled | 6 LT 3 cwt (6,249 kg) |
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| • 3rd coupled | 6 LT 1 cwt (6,147 kg) |
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| Adhesive weight | 18 LT 4 cwt (18,490 kg) |
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| Loco weight | 29 LT 14 cwt (30,180 kg) |
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| Fuel type | Coal |
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| Fuel capacity | 21 long hundredweight 2 qtr (1.1 t) |
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| Water cap. | 820 imp gal (3,730 L) |
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| Firebox: | |
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| • Type | Belpaire |
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| • Grate area | 11 sq ft (1.0 m2) |
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Boiler:
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| • Pitch | 4 ft 9 in (1,448 mm) |
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| • Diameter | 3 ft 3+1⁄2 in (1,003 mm) |
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| • Tube plates | 11 ft 2+1⁄8 in (3,407 mm) |
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| • Small tubes | 128: 1+3⁄4 in (44 mm) |
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| Boiler pressure | 165 psi (1,138 kPa) |
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| Safety valve | Ramsbottom |
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| Heating surface: | |
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| • Firebox | 45.5 sq ft (4.23 m2) |
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| • Tubes | 655.4 sq ft (60.89 m2) |
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| • Total surface | 700.9 sq ft (65.12 m2) |
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| Cylinders | Two |
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| Cylinder size | 11+1⁄2 in (292 mm) bore
15 in (381 mm) stroke |
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| Valve gear | Walschaerts |
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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 |
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| Class | Class NG4 |
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| Number in class | 7 |
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| Numbers | NGR no. 10-11
SAR no. NG10-NG16 |
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| Delivered | 1911-1914 |
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| First run | 1911 |
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| Withdrawn | 1948 |
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| Preserved | No. NG16 |
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The South African Railways Class NG4 4-6-2T of 1911 was a narrow-gauge steam locomotive from the pre-Union era in the Colony of Natal.
In 1911, shortly before being amalgamated into the South African Railways, the Natal Government Railways placed the first two of seven 4-6-2 Pacific type narrow-gauge tank steam locomotives in service. In 1912, when these two locomotives were assimilated into the South African Railways, they retained their engine numbers, but with an "NG" prefix added.
Five more of these locomotives were delivered to the South African Railways in 1913 and 1914. When a system of grouping narrow-gauge locomotives into classes was eventually introduced somewhere between 1928 and 1930, they were all designated Class NG4.
