Lufkin Land & Lumber Company 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 7 (Locobase 14147)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 48, p. 257 and Volume 62, pp. 366+. Works numbers were 40539 in September 1913 and 52854 in January 1920.

As in many Baldwin logging locomotives, the specs called for "Spring rigging to be extra heavy for rough service."

17, which was ordered six years after the 7, burned oil and trailed a tender holding 1,500 gallons (5,678 litres) of oil. She also put a little more weight on the drivers (68,000 lb/30,844 kg) and had a total engine weight of 89,000 lb (40,370 kg).

Specifications by Steve Llanso of Sweat House Media
Locobase ID14147
RailroadLufkin Land & Lumber Company
Number in Class2
Road Numbers7, 17
Number Built2
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase 9.17'
Engine Wheelbase23.75'
Ratio of driving wheelbase to overall engine wheebase 0.39
Overall Wheelbase (engine & tender)50'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers64000 lbs
Engine Weight86000 lbs
Tender Light Weight60000 lbs
Total Engine and Tender Weight146000 lbs
Tender Water Capacity3000 gals
Tender Fuel Capacity (oil/coal)5 tons
Minimum weight of rail (calculated)36 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"
Boiler Pressure175 psi
Cylinders (dia x stroke)15" x 20"
Tractive Effort15213 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.21
Heating Ability
Firebox Area87 sq. ft
Grate Area14.10 sq. ft
Evaporative Heating Surface995 sq. ft
Superheating Surface
Combined Heating Surface995 sq. ft
Evaporative Heating Surface/Cylinder Volume243.24
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2468
Same as above plus superheater percentage2468
Same as above but substitute firebox area for grate area15225
Power L14486
Power MT463.59

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