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Northern Pacific classes WA, WB and W-1

WA No. 1517

The Northern Pacific was the first US railroad to purchase a significant number of Mikados. These machines grouped under the class W were 55 locomotives of the subclass WA without a combustion chamber and 105 WB with ...

	Northern Pacific classes WA, WB and W-1 Remove
Variant	WA WA WB WA/WB superheated W-1
Built	1904
Manufacturers	ALCO
Wheel arrangement	1D1
Gauge	1435 mm
Length
Service mass	117481 kg
Top speed
Power
Engine

General

Property	Northern Pacific classes WA, WB and W-1 WA WA WB WA/WB superheated W-1 Remove
Built	1904
Manufacturers	ALCO
Wheel arrangement	2-8-2 (Mikado)
Gauge	1,435 mm

Dimensions and weights

Property	Northern Pacific classes WA, WB and W-1 WA WA WB WA/WB superheated W-1 Remove
Wheelbase	10.59 m
Service mass	117.5 t
Adhesion mass	92.3 t
Total mass	184.8 t
Rigid wheelbase	5.03 m
Axle load	26.3 t
Water capacity	30,283 l
Fuel capacity	10.9 t (coal)

Boiler

Property	Northern Pacific classes WA, WB and W-1 WA WA WB WA/WB superheated W-1 Remove
Grate area	4.041 m²
Firebox surface	19.417 m²
Tube heating surface	352.846 m²
Evaporative heating surface	372.263 m²
Total heating surface	372.3 m²

Power plant

Property	Northern Pacific classes WA, WB and W-1 WA WA WB WA/WB superheated W-1 Remove
Driver diameter	1,600 mm
Boiler pressure	11.7 bar
Expansion type	simple expansion
Cylinders	two, 610 x 762 mm

Power

Property	Northern Pacific classes WA, WB and W-1 WA WA WB WA/WB superheated W-1 Remove
Power source	steam
Estimated power	1,119 kW (1,521 PS)
Starting effort	176.3 kN

Calculated values

Property	Northern Pacific classes WA, WB and W-1 WA WA WB WA/WB superheated W-1 Remove
Factor of adhesion	1 : 5.14
Optimal speed	39 km/h
Power-to-weight ratio	9.5 kW/t
Heating Surface Equivalent	469.3 m²
Cylinder volume/HSE	1 : 947.70
Adhesive weight/Total	1 : 1.27
Tractive force/Heating surface	1 : 9.89
Grate area/Heating surface	1 : 92.12
Firebox/Tube surface	1 : 18.17

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