Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University , Volume 41, p. 37. Works number was 38470 in October 1912.
Although based on a widely used plantation Mogul often operated on the metre gauge or larger, the 15 had to be adapted to the narrower spread of the 3-foot layout used by this Waukegon, Texas logger for its tram road. This meant a narrower, hence smaller grate, but deeper firebox that could burn either coal or wood; its heating surface area was slightly larger as a result.
The specs say emphatically that the "old" rail weight is 35 lb/yard (17.5 kg/metre) and that the "weight of engine must not overrun specification. Investigate weight and if specified weight is too great for 35 lb. rails, it must be reduced." Note that because it was a logging road and not a common carrier, the KMC could specify the dangerously antiquated link-and-pin couplers that had been banned from common carriers for decades.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 15 |
| Locobase ID | 13898 |
| Railroad | Keystone Mills |
| Country | USA |
| Whyte | 2-6-0 |
| Number in Class | 1 |
| Road Numbers | 15 |
| Gauge | 3' |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1912 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 9.67 / 2.95 |
| Engine Wheelbase (ft / m) | 15.92 / 4.85 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.61 |
| Overall Wheelbase (engine & tender) (ft / m) | 35.58 / 10.84 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 49,000 / 22,226 |
| Engine Weight (lbs / kg) | 58,000 / 26,308 |
| Tender Loaded Weight (lbs / kg) | 44,000 / 19,958 |
| Total Engine and Tender Weight (lbs / kg) | 102,000 / 46,266 |
| Tender Water Capacity (gals / ML) | 2200 / 8.33 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 27 / 13.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 42 / 1067 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 14" x 18" / 356x457 |
| Tractive Effort (lbs / kg) | 11,424 / 5181.85 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.29 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 153 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 8.62 / 2.63 |
| Firebox Area (sq ft / m2) | 71 / 6.60 |
| Grate Area (sq ft / m2) | 12.50 / 1.16 |
| Evaporative Heating Surface (sq ft / m2) | 669 / 62.15 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 669 / 62.15 |
| Evaporative Heating Surface/Cylinder Volume | 208.41 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2000 |
| Same as above plus superheater percentage | 2000 |
| Same as above but substitute firebox area for grate area | 11,360 |
| Power L1 | 3573 |
| Power MT | 482.27 |