A H Stange Lumber Company 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 2 (Locobase 11726)

Data from Negative 8440, Southern Methodist University, Central University Libraries, DeGolyer Library collection of digitized Baldwin images, retrieved 26 October 2010 from [] . See also DeGolyer, Vol 71, pp. 398+. Works number was 55573 in July 1922.

The negative shows an unusual arrangement of the outside radial Walschaert valve gear. To allow for the proper length of combination rod, the link was mounted over the middle driver.

Although lettered for AH Stange of Merrill, Wisc, this Prairie logger was operated by William Boniface Lumber over 60 lb/yard (30 kg/metre) rail up 3% grades and around 25 degree curves. It seems to have run in Saint Bernard Mining service later and after that, the Mosinee Paper Mills.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID11,726
RailroadA H Stange Lumber Company
Number in Class1
Road Numbers2
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)9 / 2.74
Engine Wheelbase (ft / m)24.50 / 7.47
Ratio of driving wheelbase to overall engine wheebase 0.37
Overall Wheelbase (engine & tender) (ft / m)48.33 / 14.73
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)84,570 / 38,360
Engine Weight (lbs / kg)106,620 / 48,362
Tender Loaded Weight (lbs / kg)71,680 / 32,514
Total Engine and Tender Weight (lbs / kg)178,300 / 80,876
Tender Water Capacity (gals / ML)3500 / 13.26
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)5 / 4.50
Minimum weight of rail (calculated) (lb/yd / kg/m)47 / 23.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)46 / 1168
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)16" x 24" / 406x610
Tractive Effort (lbs / kg)20,435 / 9269.17
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.14
Heating Ability
Firebox Area (sq ft / m2)83 / 7.71
Grate Area (sq ft / m2)16.20 / 1.51
Evaporative Heating Surface (sq ft / m2)1529 / 142.10
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1529 / 142.10
Evaporative Heating Surface/Cylinder Volume273.77
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2916
Same as above plus superheater percentage2916
Same as above but substitute firebox area for grate area14,940
Power L14803
Power MT375.62

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