Deer Island Logging 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 102 (Locobase 11005)

Data from "Logging Locomotives", Record of Recent Construction #96 (Baldwin Locomotive Works, 1918), p. 7. See also DeGolyer, Vol 52, pp. 353+. Works numbers were 43960 in August 1916, 56633 in May 1923. 57610 in January 1924.

This was a typical solution to the limitations posed by the twisting, steep, and lightly built logging roads on steam locomotive power. Add a truck at each end of a switcher to allow operation in either direction without turning the locomotive and to spread the weight over 67% more axles. The result was obviously satisfactory as the railroad added a second engine seven years later, and a third (bought by the Deer Lake's parent, Murphy Timber) in 1924. The latter two had 700-US gallon (2,650-litre) oil bunkers.

The Deer Island ran from the Columbia River to the VanNatta treefarm in eastern Oregon. At several points, the line built tall beanpole and cornstalk trestles to span deep creeks. The road laid 56 lb/yard (28 kg/metre) rail, included 5% grades, and curved up to 25 degrees (radii of 222 feet/67.7 metres).

After an unspecified number of years on the DILC, the 102 went to the Saginaw Logging Company in Valsetz, Ore as their #6. Western Logging bought the 6 years later and renumbered it 106. 101 was sold to Trask Willamette.

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID11005
RailroadDeer Island Logging
Number in Class1
Road Numbers102, 101, 103
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)10 / 3.05
Engine Wheelbase (ft / m)25.75 / 7.85
Ratio of driving wheelbase to overall engine wheelbase 0.39
Overall Wheelbase (engine & tender) (ft / m)25.75 / 7.85
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)91,000 / 41,277
Engine Weight (lbs / kg)118,000 / 53,524
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)118,000
Tender Water Capacity (gals / ML)1600 / 6.06
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)550 / 2082
Minimum weight of rail (calculated) (lb/yd / kg/m)51 / 25.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)165 / 11.40
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610
Tractive Effort (lbs / kg)22,109 / 10028.49
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.12
Heating Ability
Tubes (number - dia) (in / mm)152 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)13.54 / 4.13
Firebox Area (sq ft / m2)80 / 7.43
Grate Area (sq ft / m2)14.40 / 1.34
Evaporative Heating Surface (sq ft / m2)1151 / 106.97
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1151 / 106.97
Evaporative Heating Surface/Cylinder Volume182.41
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2376
Same as above plus superheater percentage2376
Same as above but substitute firebox area for grate area13,200
Power L12974
Power MT216.15

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Wes Barris