Calcasieu Long Leaf Lumber Company 2-6-2 "Prairie" Locomotives of 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.

Specifications by Steve Llanso of Sweat House Media
Class68
Locobase ID14934
RailroadCalcasieu Long Leaf Lumber Company
CountryUSA
Whyte2-6-2
Number in Class1
Road Numbers68
GaugeStd
Number Built1
BuilderBaldwin
Year1920
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase10.25'
Engine Wheelbase26.83'
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender)50.50'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers101000 lbs
Engine Weight130000 lbs
Tender Light Weight90000 lbs
Total Engine and Tender Weight220000 lbs
Tender Water Capacity4500 gals
Tender Fuel Capacity (oil/coal)6 tons
Minimum weight of rail (calculated)56 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter47"
Boiler Pressure200 psi
Cylinders (dia x stroke)17" x 24"
Tractive Effort25088 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.03
Heating Ability
Firebox Area104 sq. ft
Grate Area18.70 sq. ft
Evaporative Heating Surface1438 sq. ft
Superheating Surface344 sq. ft
Combined Heating Surface1782 sq. ft
Evaporative Heating Surface/Cylinder Volume228.07
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 area24752
Power L112558
Power MT822.35


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