Lufkin Land & Lumber Company 2-6-2 "Prairie" Locomotives in 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).

Principal Dimensions by Steve Llanso of Sweat House Media
Class7
Locobase ID14,147
RailroadLufkin Land & Lumber Company
CountryUSA
Whyte2-6-2
Number in Class2
Road Numbers7, 17
GaugeStd
Number Built2
BuilderBaldwin
Year1914
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.17 / 2.80
Engine Wheelbase (ft / m)23.75 / 7.24
Ratio of driving wheelbase to overall engine wheebase 0.39
Overall Wheelbase (engine & tender) (ft / m)50 / 15.24
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)64,000 / 29,030
Engine Weight (lbs / kg)86,000 / 39,009
Tender Loaded Weight (lbs / kg)60,000 / 27,216
Total Engine and Tender Weight (lbs / kg)146,000 / 66,225
Tender Water Capacity (gals / ML)3000 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)5 / 4.50
Minimum weight of rail (calculated) (lb/yd / kg/m)36 / 18
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)175 / 12.10
High Pressure Cylinders (dia x stroke) (in / mm)15" x 20" / 381x508
Tractive Effort (lbs / kg)15,213 / 6900.51
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.21
Heating Ability
Firebox Area (sq ft / m2)87 / 8.08
Grate Area (sq ft / m2)14.10 / 1.31
Evaporative Heating Surface (sq ft / m2)995 / 92.44
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)995 / 92.44
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 area15,225
Power L14486
Power MT463.59