Calcasieu Long Leaf Lumber Company 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 68 (Locobase 14934)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 65, p. 40. See also Lawrence S Earley, Looking for Longleaf: The Fall And Rise of an American Forest (Chapel Hill: University of North Carolina Press, 2004), esp. pp. 243-244. Works number was 54077 in November 1920.

Earley's comments on the immense Calcasieu forest are worth repeating in part. He tells us that the stand of longleaf yellow pine bounded by the Sabine River on the west, the Calcasieu on the east, and the Red River on the north, covered 4,500 sq miles (and was so densely grown that harvests yielded 12,000 to 30,000 board feet per acre. The wood from these woods "became a trademark for all that lumber buyers wanted from longleaf lumber--strength, durability, and great size." (p. 243).

On p. 244, Earley describes the "deeper and more indelible scars" that remained from the decades of logging that cleared virtually the whole forest. The book describes the impact of 19th and 20th century logging on the 92 million acres (37,352,000 ha) (or 143,750 sq miles/372,614 sq km) of longleaf pine ecosystem that once stretched from Virginia to Texas.

One of the hundreds of locomotives supporting the intense extraction of timber was a superheated variant of a widely used Baldwin logging Prairie design whose saturated boiler had 200 tubes. With superheat came the use of piston valves to supply steam; these measured 9 1/2" (241 mm) in diameter.

The tube length given in the specs generates a low heating surface area compared to the heating surface areas stated in the specifications. Locobase notes that the heating surface area for the tubes alone calculates as 821 sq ft compared to the 930 sq ft shown. He's pretty sure the tube surface area is miscalculated in the specs. However, the next locomotive in Volume 65 gives the same values but shows a tube length two feet longer, which yields too high a tube heating surface. Adjusting the length to 15 feet (4.57 m) even brings the calculated and stated values close to each other.

The engine didn't remain with the CLLLCo (as the tender was lettered) for long. Its owner, Long Bell Lumber renumbered it 681 and relocated it to the Longview, Portland & Northern in Oregon in 1922. It later moved to Independence, Ore to work on the LP&N's Willamina & Grand Ronde. In 1953, Long Bell sent the engine south to work on the Mexicano del Pacifico as their 7.

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID14934
RailroadCalcasieu Long Leaf Lumber Company
Number in Class1
Road Numbers68
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.25 / 3.12
Engine Wheelbase (ft / m)26.83 / 8.18
Ratio of driving wheelbase to overall engine wheelbase 0.38
Overall Wheelbase (engine & tender) (ft / m)50.50 / 15.39
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)101,000 / 45,813
Engine Weight (lbs / kg)130,000 / 58,967
Tender Loaded Weight (lbs / kg)90,000 / 40,823
Total Engine and Tender Weight (lbs / kg)220,000 / 99,790
Tender Water Capacity (gals / ML)4500 / 17.05
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)6 / 6
Minimum weight of rail (calculated) (lb/yd / kg/m)56 / 28
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)47 / 1194
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610
Tractive Effort (lbs / kg)25,088 / 11379.74
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.03
Heating Ability
Tubes (number - dia) (in / mm)114 - 2" / 51
Flues (number - dia) (in / mm)21 - 5.375" / 137
Flue/Tube length (ft / m)15 / 4.57
Firebox Area (sq ft / m2)104 / 9.66
Grate Area (sq ft / m2)18.70 / 1.74
Evaporative Heating Surface (sq ft / m2)1438 / 133.59
Superheating Surface (sq ft / m2)344 / 31.96
Combined Heating Surface (sq ft / m2)1782 / 165.55
Evaporative Heating Surface/Cylinder Volume227.89
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3740
Same as above plus superheater percentage4451
Same as above but substitute firebox area for grate area24,752
Power L112,548
Power MT821.69

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