Twin Tree Lumber Company 2-6-0 "Mogul" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Chas. A Sands (Locobase 13189)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 31, p.52. See also Megan Kate Nelson, Trembling Earth: A cultural history of the Okefenokee Swamp (Athens, Ga: University of Georgia Press, 2005). Works number was 41516 in June 1914.

The specification called for this good-sized Mogul to haul 800 trailing tons up a 1 1/2% grade. The road number piques Locobase's interest: did the Twin Tree wish to hark back to the record-breaking New York Central 4-4-0, or was the assignment simply a indication that this was the one and only locomotive for this logger?

Twin Tree Lumber's headquarters was in Maplesville, Alabama; one of its specialties was long leaf yellow pine rift flooring. Twin Tree ventured into the Okefenokee Swamp when it leased pine timber on Billys, Minnies, Honey, Blackjack and several other islands in the Okefenokee Swamp.

The railroad was abandoned in 1918, after which the 999 wound up on the Multnomah Lumber & Box. In 1923, Flora Logging purchased the engine, which then ran for two more decades before being scrapped in April 1943.

Principal Dimensions by Steve Llanso of Sweat House Media
ClassChas. A Sands
Locobase ID13,189
RailroadTwin Tree Lumber Company
Number in Class1
Road Numbers999
Number Built1
BuilderBurnham, Williams & Co
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)12 / 3.66
Engine Wheelbase (ft / m)21 / 6.40
Ratio of driving wheelbase to overall engine wheebase 0.57
Overall Wheelbase (engine & tender) (ft / m)52.25 / 15.93
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)130,000 / 58,967
Engine Weight (lbs / kg)145,000 / 65,771
Tender Loaded Weight (lbs / kg)90,000 / 40,823
Total Engine and Tender Weight (lbs / kg)235,000 / 106,594
Tender Water Capacity (gals / ML)4500 / 17.05
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)8 / 7.30
Minimum weight of rail (calculated) (lb/yd / kg/m)72 / 36
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)50 / 1270
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)19" x 26" / 483x660
Tractive Effort (lbs / kg)31,912 / 14475.06
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.07
Heating Ability
Firebox Area (sq ft / m2)163.60 / 15.20
Grate Area (sq ft / m2)30.70 / 2.85
Evaporative Heating Surface (sq ft / m2)1963 / 182.43
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1963 / 182.43
Evaporative Heating Surface/Cylinder Volume230.07
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation6140
Same as above plus superheater percentage6140
Same as above but substitute firebox area for grate area32,720
Power L15432
Power MT276.36

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