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The reference for locomotives and railcars

New Zealand Railways class K (1877)

New Zealand 1877 8 produced
The preserved K 92 in November 2016 Tony Hisgett / Rogers Steam Locomotive 2 CC BY 2.0

After some British locomotives, the K class of 1877 was the first US locomotive to see service in New Zealand. Externally, compared to the British locomotives, it had many special features that caused a stir. These included the graceful bar frame, the swiveling trailing axle, many attachments located outside of the boiler and the rich decoration. The agile running characteristics in particular were apparently an advantage over the predecessors on the South Island of New Zealand. With the introduction of more powerful locomotives, they were used more on branch lines and some were moved to the North Island. After receiving new boilers, some with Belpaire fireboxes, they were retired in the 1920s.

Drawing with the original boiler (even if the year is wrong) Railway and Locomotive Engineering, August 1897

Technical data

General

Property as built rebuilt
Built 1877-1878 1903
Manufacturers Rogers
Wheel arrangement 2-4-2 (Columbia)
Gauge 1,067 mm (Cape gauge)

Dimensions and weights

Property as built rebuilt
Length 13.89 m
Wheelbase 6.78 m
Service mass 23.7 t 23.1 t
Adhesion mass 15 t 13.6 t
Total mass 43.2 t 42.6 t
Rigid wheelbase 3.61 m
Axle load 7.5 t 6.8 t
Water capacity 5,682 l
Fuel capacity 2.2 t (coal)

Boiler

Property as built rebuilt
Grate area 0.819 m² 0.938 m²
Evaporative heating surface 54.72 m²
Total heating surface 54.7 m²

Power plant

Property as built rebuilt
Driver diameter 1,257 mm
Boiler pressure 9 bar 11 bar
Expansion type simple expansion
Cylinders two, 305 x 508 mm

Power

Property as built rebuilt
Power source steam
Estimated power 205 kW (279 PS) 298 kW (405 PS)
Starting effort 28.6 kN 35.2 kN

Calculated values

Property as built rebuilt
Factor of adhesion 1 : 5.16 1 : 3.79
Optimal speed 43 km/h 51 km/h
Power-to-weight ratio 8.7 kW/t 12.9 kW/t
Adhesive weight/Total 1 : 1.57 1 : 1.70
Tractive force/Heating surface 1 : 10.92
Grate area/Heating surface 1 : 66.81
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