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Soo Line classes H-3 and H-21 to H-23

H-23 No. 2719 in September 2007 at Two Harbors, Montana

In 1911 Soo Line and its Wisconsin Central subsidiary began manufacturing a series of Pacifics ranging from the H-3 to the H-23 of 1923. It started with eleven H-3s and ten H-21s, which differed almost only in the boi...

	Soo Line classes H-3 and H-21 to H-23 Remove
Variant	H-21 H-3 H-21 H-22 H-23
Built	1911
Manufacturers	ALCO
Wheel arrangement	2C1
Gauge	1435 mm
Length
Service mass	117481 kg
Top speed
Power
Engine

General

Property	Soo Line classes H-3 and H-21 to H-23 H-21 H-3 H-21 H-22 H-23 Remove
Built	1911
Manufacturers	ALCO
Wheel arrangement	4-6-2 (Pacific)
Gauge	1,435 mm

Dimensions and weights

Property	Soo Line classes H-3 and H-21 to H-23 H-21 H-3 H-21 H-22 H-23 Remove
Length loco	14.21 m
Wheelbase	10.54 m
Total wheelbase	20.17 m
Service mass	117.5 t
Adhesion mass	71.9 t
Total mass	182.3 t
Rigid wheelbase	4.12 m
Axle load	24.9 t
Water capacity	28,391 l
Fuel capacity	10.9 t (coal)

Boiler

Property	Soo Line classes H-3 and H-21 to H-23 H-21 H-3 H-21 H-22 H-23 Remove
Grate area	4.901 m²
Firebox surface	19.268 m²
Tube heating surface	309.516 m²
Evaporative heating surface	328.784 m²
Superheater surface	74.787 m²
Total heating surface	403.6 m²

Power plant

Property	Soo Line classes H-3 and H-21 to H-23 H-21 H-3 H-21 H-22 H-23 Remove
Driver diameter	1,905 mm
Boiler pressure	12.8 bar
Expansion type	simple expansion
Cylinders	two, 635 x 660 mm

Power

Property	Soo Line classes H-3 and H-21 to H-23 H-21 H-3 H-21 H-22 H-23 Remove
Power source	steam
Estimated power	1,398 kW (1,901 PS)
Starting effort	151.6 kN

Calculated values

Property	Soo Line classes H-3 and H-21 to H-23 H-21 H-3 H-21 H-22 H-23 Remove
Factor of adhesion	1 : 4.65
Optimal speed	56 km/h
Power-to-weight ratio	11.9 kW/t
Heating Surface Equivalent	574.7 m²
Cylinder volume/HSE	1 : 727.84
Adhesive weight/Total	1 : 1.63
Tractive force/Heating surface	1 : 7.84
Grate area/Heating surface	1 : 82.34
Firebox/Tube surface	1 : 16.06
Total/Superheater	1 : 4.40

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