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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...

General

Property	Soo Line classes H-3 and H-21 to H-23 H-22 H-3 H-21 H-22 H-23 Remove
Built	1914
Manufacturers	ALCO
Wheel arrangement	4-6-2 (Pacific)
Gauge	1,435 mm (Standard gauge)

Dimensions and weights

Property	Soo Line classes H-3 and H-21 to H-23 H-22 H-3 H-21 H-22 H-23 Remove
Length loco	14.21 m
Wheelbase	10.54 m
Rigid wheelbase	4.12 m
Total wheelbase	20.17 m
Service weight	119.7 t
Adhesive weight	73.9 t
Axle load	26 t
Total weight	184.7 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-22 H-3 H-21 H-22 H-23 Remove
Grate area	4.901 m²
Firebox surface	19.272 m²
Tube heating surface	295.856 m²
Evaporative heating surface	315.127 m²
Superheater surface	68.377 m²
Total heating surface	383.5 m²

Power plant

Property	Soo Line classes H-3 and H-21 to H-23 H-22 H-3 H-21 H-22 H-23 Remove
Driver diameter	1,905 mm
Boiler pressure	13.8 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-22 H-3 H-21 H-22 H-23 Remove
Power source	steam
Estimated power	1,473 kW (2,003 PS)
Starting effort	163.8 kN

Calculated values

Property	Soo Line classes H-3 and H-21 to H-23 H-22 H-3 H-21 H-22 H-23 Remove
Factor of adhesion	1 : 4.43
Optimal speed	55 km/h
Power-to-weight ratio	12.3 kW/t
Heating Surface Equivalent	548.2 m²
Cylinder volume/HSE	1 : 762.96
Adhesive weight/Total	1 : 1.62
Tractive force/Heating surface	1 : 8.92
Grate area/Heating surface	1 : 78.25
Firebox/Tube surface	1 : 15.35
Total/Superheater	1 : 4.61

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