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). (Thanks to Ivo Rutishauser for his 30 August 2025 email pointing out the mistaken works number attributed to this locomotive.) Works number was 31888 in October 1907..
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? (Two Glover Locomotive Works Moguls had 12" x 16" (305 x 406 mm) cylinders. One--Glover works number 121639--was the only other new locomotive on the TT. It left the factory in January 1920.)
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 Middle Run Media | |
|---|---|
| Class | Charles A Sands |
| Locobase ID | 13189 |
| Railroad | Twin Tree Lumber Company |
| Country | USA |
| Whyte | 2-6-0 |
| Number in Class | 1 |
| Road Numbers | 999 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Burnham, Williams & Co |
| Year | 1907 |
| Valve Gear | Walschaert |
| 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 wheelbase | 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 / Liters/MT) | 8 / 7 |
| 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 / 1380 |
| 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 | |
| Tubes (number - dia) (in / mm) | 283 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 12.19 / 3.72 |
| 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 Volume | 230.13 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 6140 |
| Same as above plus superheater percentage | 6140 |
| Same as above but substitute firebox area for grate area | 32,720 |
| Power L1 | 5434 |
| Power MT | 276.46 |