| South African Class 25NC 4-8-4 |
|---|
|
|
| Specifications |
|---|
Configuration:
| |
|---|
| • Whyte | 4-8-4 (Northern) |
|---|
| Driver | 2nd coupled axle |
|---|
| Gauge | 3 ft 6 in (1,067 mm) Cape gauge |
|---|
| Leading dia. | 30 in (762 mm) |
|---|
| Coupled dia. | 60 in (1,524 mm) |
|---|
| Trailing dia. | 30 in (762 mm) |
|---|
| Tender wheels | 34 in (864 mm) |
|---|
| Minimum curve | 275 ft (84 m) |
|---|
| Wheelbase | ♠ 81 ft 4+11⁄16 in (24,808 mm)
♥ 95 ft 1+11⁄16 in (28,999 mm) |
|---|
| • Engine | 38 ft (11,582 mm) |
|---|
| • Leading | 6 ft 10 in (2,083 mm) |
|---|
| • Coupled | 15 ft 9 in (4,801 mm) |
|---|
| • Trailing | 5 ft 6 in (1,676 mm) |
|---|
| • Tender | ♠ 32 ft (9,754 mm)
♥ 45 ft 10 in (13,970 mm) |
|---|
| • Tender bogie | 10 ft (3,048 mm) |
|---|
Length:
| |
|---|
| • Over couplers | ♠ 91 ft 6+9⁄16 in (27,903 mm)
♥ 107 ft 6+1⁄16 in (32,768 mm) |
|---|
| Height | 13 ft (3,962 mm) |
|---|
| Frame type | Cast |
|---|
| Axle load | 18 LT 14 cwt (19,000 kg) |
|---|
| • Leading | 21 LT 2 cwt (21,440 kg) |
|---|
| • 1st coupled | 18 LT 10 cwt (18,800 kg) |
|---|
| • 2nd coupled | 18 LT 14 cwt (19,000 kg) |
|---|
| • 3rd coupled | 18 LT 12 cwt (18,900 kg) |
|---|
| • 4th coupled | 18 LT 9 cwt (18,750 kg) |
|---|
| • Trailing | 22 LT 12 cwt (22,960 kg) |
|---|
| • Tender bogie | Bogie 1:
♠ 51 LT 6 cwt (52,120 kg)
Bogie 2:
♠ 54 LT 5 cwt (55,120 kg) |
|---|
| • Tender axle | ♠ 18 LT 1 cwt 2 qtr (18,370 kg) |
|---|
| Adhesive weight | 74 LT 5 cwt (75,440 kg) |
|---|
| Loco weight | 117 LT 9 cwt (119,300 kg) |
|---|
| Tender weight | ♠ 105 LT 11 cwt (107,200 kg) |
|---|
| Total weight | ♠ 223 LT (226,600 kg) |
|---|
| Tender type | EW1 (3-axle bogies)
EW2 (3-axle bogies) |
|---|
| Fuel type | Coal |
|---|
| Fuel capacity | ♠ 18 LT (18.3 t)
♥ 19 LT (19.3 t) |
|---|
| Water cap. | ♠ 10,500 imp gal (47,700 L)
♥ 11,200 imp gal (50,900 L) |
|---|
| Firebox: | |
|---|
| • Type | Round-top |
|---|
| • Grate area | 70 sq ft (6.5 m2) |
|---|
Boiler:
| |
|---|
| • Type | Domeless |
|---|
| • Pitch | 9 ft 1+5⁄8 in (2,784 mm) |
|---|
| • Diameter | 6 ft 4+1⁄8 in (1,934 mm) |
|---|
| • Tube plates | 19 ft (5,791 mm) |
|---|
| • Small tubes | 158: 2+1⁄2 in (64 mm) |
|---|
| • Large tubes | 40: 5+1⁄2 in (140 mm) |
|---|
| Boiler pressure | 225 psi (1,551 kPa) |
|---|
| Safety valve | Ross-pop |
|---|
| Heating surface: | |
|---|
| • Firebox | 294 sq ft (27.3 m2) |
|---|
| • Tubes | 3,059 sq ft (284.2 m2) |
|---|
| • Arch tubes | 37 sq ft (3.4 m2) |
|---|
| • Total surface | 3,390 sq ft (315 m2) |
|---|
Superheater:
| |
|---|
| • Type | Melesco |
|---|
| • Heating area | 630 sq ft (59 m2) |
|---|
| Cylinders | Two |
|---|
| Cylinder size | 24 in × 28 in (610 mm × 711 mm)
bore x stroke |
|---|
| Valve gear | Walschaerts |
|---|
| Valve type | Piston |
|---|
| Valve travel | 7+3⁄8 in (187 mm) |
|---|
| Loco brake | Vacuum |
|---|
| Couplers | AAR knuckle |
|---|
|
|
| Career |
|---|
| Operators | South African Railways |
|---|
| Class | Class 25NC |
|---|
| Number in class | 50 original, 87 rebuilt Class 25 |
|---|
| Numbers | 3401-3450, 3452-3510, 3512-3539 |
|---|
| Delivered | 1953-1954 |
|---|
| First run | 1953 |
|---|
|
The South African Railways Class 25NC 4-8-4 of 1953 was a class of steam locomotives built between 1953 and 1955 for the South African Railways (SAR). The Class 25NC was the non-condensing version of the Class 25 condensing locomotive, of which ninety were placed in service at the same time. Between 1973 and 1980, all but three of the condensing locomotives were converted to non-condensing and also designated Class 25NC.