Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 30, p. . Works numbers were 30555 in April 1907.
Most of the orders recorded in Baldwin's books were filled for the original purchaser. But the 8 locomotives intended for the Morelia y Tacambaro in Guanajunto, Mexico were redirected to several other railroads.
This engine served SLC in Arkansas all of its working life. When it was retired, the SLC donated the 123 to the City of Warren, Ark
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 123 |
| Locobase ID | 13058 |
| Railroad | Southern Lumber |
| Country | USA |
| Whyte | 4-6-0 |
| Number in Class | 1 |
| Road Numbers | 123 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Burnham, Williams & Co |
| Year | 1907 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 14.25 / 4.34 |
| Engine Wheelbase (ft / m) | 24.92 / 7.60 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.57 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 88,000 / 39,916 |
| Engine Weight (lbs / kg) | 120,000 / 54,431 |
| Tender Loaded Weight (lbs / kg) | 80,000 / 36,287 |
| Total Engine and Tender Weight (lbs / kg) | 200,000 / 90,718 |
| Tender Water Capacity (gals / ML) | 4000 / 15.15 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 49 / 24.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 54 / 1372 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 24" / 457x610 |
| Tractive Effort (lbs / kg) | 22,032 / 9993.56 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.99 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 246 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 12.87 / 3.92 |
| Firebox Area (sq ft / m2) | 144 / 13.38 |
| Grate Area (sq ft / m2) | 17.30 / 1.61 |
| Evaporative Heating Surface (sq ft / m2) | 1788 / 166.17 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1788 / 166.17 |
| Evaporative Heating Surface/Cylinder Volume | 252.90 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3114 |
| Same as above plus superheater percentage | 3114 |
| Same as above but substitute firebox area for grate area | 25,920 |
| Power L1 | 5747 |
| Power MT | 431.93 |
