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New Zealand Railways classes K[h]A[/h] and K[h]B[/h]

K[h]A[/h] 946 around 1939

The class K[h]A[/h] was an improved successor to the class K with the same driver and cylinder size. Its main improvements were changed frames due to the cracks in the K, roller bearings on all axles, hydrostatic lubr...

	New Zealand Railways classes K[h]A[/h] and K[h]B[/h]Remove
Variant	K[h]A[/h] K[h]A[/h] K[h]B[/h]
Built	1939-1945, 1950
Manufacturers	Hutt;Hillside
Wheel arrangement	2D2
Gauge	1067 mm
Length	21234 mm
Service mass	94492 kg
Top speed	121 km/h
Power
Engine

General

Property	New Zealand Railways classes K[h]A[/h] and K[h]B[/h] K[h]A[/h] K[h]A[/h] K[h]B[/h] Remove
Built	1939-1945, 1950
Manufacturers	Hutt, Hillside
Wheel arrangement	4-8-4 (Northern)
Gauge	1,067 mm

Dimensions and weights

Property	New Zealand Railways classes K[h]A[/h] and K[h]B[/h] K[h]A[/h] K[h]A[/h] K[h]B[/h] Remove
Length	21.23 m
Wheelbase	10.62 m
Service mass	94.5 t
Adhesion mass	57.3 t
Total mass	148.2 t
Rigid wheelbase	4.34 m
Axle load	14.3 t
Water capacity	22,731 l
Fuel capacity	7,136 l (oil)

Boiler

Property	New Zealand Railways classes K[h]A[/h] and K[h]B[/h] K[h]A[/h] K[h]A[/h] K[h]B[/h] Remove
Grate area	4.431 m²
Firebox surface	17.652 m²
Tube heating surface	160.908 m²
Evaporative heating surface	178.56 m²
Superheater surface	36.418 m²
Total heating surface	215.0 m²

Power plant

Property	New Zealand Railways classes K[h]A[/h] and K[h]B[/h] K[h]A[/h] K[h]A[/h] K[h]B[/h] Remove
Driver diameter	1,372 mm
Boiler pressure	13.8 bar
Expansion type	simple expansion
Cylinders	two, 508 x 660 mm

Power

Property	New Zealand Railways classes K[h]A[/h] and K[h]B[/h] K[h]A[/h] K[h]A[/h] K[h]B[/h] Remove
Power source	steam
Estimated power	1,193 kW (1,622 PS)
Top speed	121 km/h
Starting effort	145.6 kN

Calculated values

Property	New Zealand Railways classes K[h]A[/h] and K[h]B[/h] K[h]A[/h] K[h]A[/h] K[h]B[/h] Remove
Factor of adhesion	1 : 3.86
Optimal speed	50 km/h
Power-to-weight ratio	12.6 kW/t
Heating Surface Equivalent	339.7 m²
Cylinder volume/HSE	1 : 788.16
Adhesive weight/Total	1 : 1.65
Tractive force/Heating surface	1 : 14.15
Grate area/Heating surface	1 : 48.52
Firebox/Tube surface	1 : 9.12
Total/Superheater	1 : 4.90

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