New Zealand Railways class NC
New Zealand 1901 2 produced
In 1901 and 1904, the Wellington & Manawatu Railway Company received two 2-6-2 locomotives from Baldwin which were numbered 5 and 18. Both were Vauclain compounds, but had some differences. While the cab of the first one was made of wood, the second one had an all-steel cab. The newer locomotive had a smaller firebox, but a higher boiler pressure. When their operator came to the NZR in 1908, the locomotives became class NC. They were similar to the class N delivered to the NZR from Baldwin from 1885 which were two-cylinder locomotives. The two class NC were retired in 1931 and 1938.
Technical data
General
| Property | Nr. 5 | Nr. 18 |
|---|---|---|
| Built | 1901 | 1904 |
| Manufacturers | Baldwin | |
| Wheel arrangement | 2-6-2 (Prairie) | |
| Gauge | 1,067 mm (Cape gauge) | |
Dimensions and weights
| Property | Nr. 5 | Nr. 18 |
|---|---|---|
| Length | 16.71 m | |
| Wheelbase | 6.43 m | |
| Total wheelbase | 13.59 m | |
| Service mass | 40.3 t | |
| Adhesion mass | 28.1 t | |
| Total mass | 64.5 t | |
| Rigid wheelbase | 2.74 m | |
| Axle load | 9.4 t | |
| Water capacity | 6,818 l | |
| Fuel capacity | 5.1 t (coal) | |
Boiler
| Property | Nr. 5 | Nr. 18 |
|---|---|---|
| Grate area | 2.323 m² | 1.895 m² |
| Evaporative heating surface | 101.357 m² | 104.423 m² |
| Total heating surface | 101.4 m² | 104.4 m² |
Power plant
| Property | Nr. 5 | Nr. 18 |
|---|---|---|
| Driver diameter | 1,245 mm | |
| Boiler pressure | 12.4 bar | 13.8 bar |
| Expansion type | compound | |
| Cylinders | four, HP: 254 x 508 mm and LP: 432 x 508 mm | |
Power
| Property | Nr. 5 | Nr. 18 |
|---|---|---|
| Power source | steam | |
| Estimated power | 559 kW (760 PS) | 503 kW (684 PS) |
| Starting effort | 41.3 kN | 45.9 kN |
| Starting effort simple | 49.5 kN | 55.0 kN |
Calculated values
| Property | Nr. 5 | Nr. 18 |
|---|---|---|
| Factor of adhesion | 1 : 6.69 | 1 : 6.02 |
| Optimal speed | 84 km/h | 68 km/h |
| Power-to-weight ratio | 13.9 kW/t | 12.5 kW/t |
| Adhesive weight/Total | 1 : 1.43 | |
| Tractive force/Heating surface | 1 : 8.51 | 1 : 9.17 |
| Grate area/Heating surface | 1 : 43.63 | 1 : 55.10 |