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Federated Malay States classes O[h]1[/h] to O[h]4[/h]

O[h]4[/h] No. 564.01 “Kangar”

To accommodate increased mail traffic, the meter-gauge Federated Malay State Railways ordered class O Pacifics from North British at the end of the 1930s. Due to individual batches built between 1938 and 1946, they we...

	Federated Malay States classes O[h]1[/h] to O[h]4[/h]Remove
Variant	O[h]3[/h], O[h]4[/h] O[h]1[/h], O[h]2[/h] O[h]3[/h], O[h]4[/h]
Built	1940, 1946
Manufacturers	North British
Wheel arrangement	2C1
Gauge	1000 mm
Length
Service mass	60455 kg
Top speed
Power
Engine

General

Property	Federated Malay States classes O[h]1[/h] to O[h]4[/h] O[h]3[/h], O[h]4[/h] O[h]1[/h], O[h]2[/h] O[h]3[/h], O[h]4[/h] Remove
Built	1940, 1946
Manufacturers	North British
Wheel arrangement	4-6-2 (Pacific)
Gauge	1,000 mm

Dimensions and weights

Property	Federated Malay States classes O[h]1[/h] to O[h]4[/h] O[h]3[/h], O[h]4[/h] O[h]1[/h], O[h]2[/h] O[h]3[/h], O[h]4[/h] Remove
Wheelbase	8.61 m
Total wheelbase	15.72 m
Service mass	60.5 t
Adhesion mass	38.7 t
Total mass	105.5 t
Rigid wheelbase	3.05 m
Axle load	13 t
Water capacity	15,592 l
Fuel capacity	10,910 l (oil)

Boiler

Property	Federated Malay States classes O[h]1[/h] to O[h]4[/h] O[h]3[/h], O[h]4[/h] O[h]1[/h], O[h]2[/h] O[h]3[/h], O[h]4[/h] Remove
Grate area	2.508 m²
Firebox surface	35.768 m²
Tube heating surface	103.03 m²
Evaporative heating surface	138.797 m²
Superheater surface	20.253 m²
Total heating surface	159.1 m²

Power plant

Property	Federated Malay States classes O[h]1[/h] to O[h]4[/h] O[h]3[/h], O[h]4[/h] O[h]1[/h], O[h]2[/h] O[h]3[/h], O[h]4[/h] Remove
Driver diameter	1,372 mm
Boiler pressure	17.2 bar
Expansion type	simple expansion
Cylinders	three, 330 x 610 mm

Power

Property	Federated Malay States classes O[h]1[/h] to O[h]4[/h] O[h]3[/h], O[h]4[/h] O[h]1[/h], O[h]2[/h] O[h]3[/h], O[h]4[/h] Remove
Power source	steam
Estimated power	1,268 kW (1,724 PS)
Starting effort	106.5 kN

Calculated values

Property	Federated Malay States classes O[h]1[/h] to O[h]4[/h] O[h]3[/h], O[h]4[/h] O[h]1[/h], O[h]2[/h] O[h]3[/h], O[h]4[/h] Remove
Factor of adhesion	1 : 3.57
Optimal speed	72 km/h
Power-to-weight ratio	21.0 kW/t
Heating Surface Equivalent	358.1 m²
Cylinder volume/HSE	1 : 437.27
Adhesive weight/Total	1 : 1.56
Tractive force/Heating surface	1 : 13.98
Grate area/Heating surface	1 : 63.42
Firebox/Tube surface	1 : 2.88
Total/Superheater	1 : 6.85

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