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The reference for locomotives and railcars

New Zealand Railways class N

New Zealand 1885 12 produced
No. 354 on an old photo Albert Percy Godber / Godber Collection, Alexander Turnbull Library PD

The class N was introduced in a time when more and more American locomotives were built for the NZR, as the American designs were generally lighter and more flexible than the British ones. The N was a 2-6-2 that was intended for passenger and mail working. In 1885, six were delivered to the NZR by Baldwin. Two similar locomotives were built in 1891 for the Wellington and Manawatu Railway Company (WMR). The last four were again for the NZR and arrived in 1901. Later the WMR received four similar locomotives which were Vauclain compounds.

Originally, all were used on the North Island. In 1892, WMR No. 9 set a cape gauge speed record with 64.4 mph or 103.6 km/h. In World War I, the two WMR locomotives came to the Westland region of the South Island. All were withdrawn between 1926 and 1934. Although none were preserved, WMR No. 9 was one of the locomotives which had been buried in Bealey River. It was dug out between 2003 and 2006 and now, Steam Incorporated is restoring it.

Technical data

General

Property 1885 variant 1901 variant
Built 1885, 1891 1901
Manufacturers Baldwin
Wheel arrangement 2-6-2 (Prairie)
Gauge 1,067 mm (Cape gauge)

Dimensions and weights

Property 1885 variant 1901 variant
Length 15.29 m
Wheelbase 7.06 m 6.73 m
Total wheelbase 12.90 m 12.48 m
Service mass 29.7 t 31.7 t
Adhesion mass 22.9 t 22.8 t
Total mass 45.9 t 49.9 t
Rigid wheelbase 2.90 m
Axle load 7.9 t 7.8 t
Water capacity 22,731 l
Fuel capacity 7.6 t (coal)

Boiler

Property 1885 variant 1901 variant
Grate area 1.486 m²
Firebox surface 8.129 m² 7.618 m²
Tube heating surface 77.15 m² 74.508 m²
Evaporative heating surface 84.913 m² 82.126 m²
Total heating surface 84.9 m² 82.1 m²

Power plant

Property 1885 variant 1901 variant
Driver diameter 1,245 mm
Boiler pressure 9.3 bar 13.8 bar
Expansion type simple expansion
Cylinders two, 381 x 508 mm

Power

Property 1885 variant 1901 variant
Power source steam
Estimated power 261 kW (355 PS) 298 kW (405 PS)
Starting effort 46.9 kN 69.4 kN

Calculated values

Property 1885 variant 1901 variant
Factor of adhesion 1 : 4.79 1 : 3.22
Optimal speed 34 km/h 26 km/h
Power-to-weight ratio 8.8 kW/t 9.4 kW/t
Heating Surface Equivalent 125.9 m² 120.2 m²
Cylinder volume/HSE 1 : 919.87 1 : 963.54
Adhesive weight/Total 1 : 1.30 1 : 1.39
Tractive force/Heating surface 1 : 11.53 1 : 17.66
Grate area/Heating surface 1 : 57.14 1 : 55.27
Firebox/Tube surface 1 : 9.49 1 : 9.78
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