National Lumber & Manufacturing Company 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 3 (Locobase 15228)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 71, p. 310. See also Works number was 55344 in April 1922.

Rail weights ran 56, 60, and 65 lb/yard (28, 30, and 32.5 kg/metre) and ruling grades at the time of this logging Prairie's delivery was 2 1/2% with 4% contemplated. The NL&MC was first headquartered at Cedarville in 1920 and moved to Elma in 1924. By 1927, the company had sold out to Polson Logging.

Gene Connelly says the 3 went to Schafer Brothers Logging of Brady, Wash as their #10. The University of Washington's University Libraries Digital Collection caption for the photo reference shown above notes that: ". At the peak of operation, the Schafers were running one of the largest logging, milling and shipping concerns in the lumber industry of the Pacific Northwest. Their properties and equipment at that time, not counting ships and tugs, included five sawmills in operation, served by six camps sending logs over 100 miles of rail. This required 18 locomotives, both geared and mainline types, and a total of 70 donkeys and 325 logging cars. To operate all of this equipment called for approximately 3000 employees."

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID15,228
RailroadNational Lumber & Manufacturing Company
Number in Class1
Road Numbers3
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.33 / 2.84
Engine Wheelbase (ft / m)25.75 / 7.85
Ratio of driving wheelbase to overall engine wheebase 0.36
Overall Wheelbase (engine & tender) (ft / m)25.75 / 7.85
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)116,000 / 52,617
Engine Weight (lbs / kg)146,000 / 66,225
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)146,000
Tender Water Capacity (gals / ML)2000 / 7.58
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)900 / 3.40
Minimum weight of rail (calculated) (lb/yd / kg/m)64 / 32
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)170 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x610
Tractive Effort (lbs / kg)25,537 / 11583.40
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.54
Heating Ability
Firebox Area (sq ft / m2)81 / 7.53
Grate Area (sq ft / m2)22.50 / 2.09
Evaporative Heating Surface (sq ft / m2)1575 / 146.32
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1575 / 146.32
Evaporative Heating Surface/Cylinder Volume222.82
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3825
Same as above plus superheater percentage3825
Same as above but substitute firebox area for grate area13,770
Power L13492
Power MT199.10

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