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The reference for locomotives and railcars

New Zealand Railways class NC

New Zealand 1901 2 produced
No. 462 circa 1909 with Albert Percy Godber Albert Percy Godber / Godber Collection, Alexander Turnbull Library PD

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
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