Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 36, p. 93. Works number was 35781 in December 1910.
This was the biggest locomotive to date to run on the PBMC short line. Even at the reatively low pressure setting, the oil-burning #1 generated good power for logging trains on 40-lb/yard (20-kg/metre) rail on a profile that included 2 1/2% ruling grades and 20-degree curves. It was not quite as big, however, as the more common version operating on many logging roads in the Northwest at the same time.
By 1916, the3 engine had gone to the Stimson Lumber Company, which was bought by Weyerhaeuser in 1917. The latter renumbered this Mikado 105.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 1 |
| Locobase ID | 13704 |
| Railroad | Port Blakely Mill Company |
| Country | USA |
| Whyte | 2-8-2 |
| Number in Class | 1 |
| Road Numbers | 1 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1910 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12.08 / 3.68 |
| Engine Wheelbase (ft / m) | 27.25 / 8.31 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.44 |
| Overall Wheelbase (engine & tender) (ft / m) | 48.96 / 14.92 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 110,000 / 49,895 |
| Engine Weight (lbs / kg) | 136,000 / 61,689 |
| Tender Loaded Weight (lbs / kg) | 60,000 / 27,216 |
| Total Engine and Tender Weight (lbs / kg) | 196,000 / 88,905 |
| Tender Water Capacity (gals / ML) | 3000 / 11.36 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1500 / 5678 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 46 / 23 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 44 / 1118 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 24" / 457x610 |
| Tractive Effort (lbs / kg) | 24,035 / 10902.11 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.58 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 263 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 13 / 3.96 |
| Firebox Area (sq ft / m2) | 140 / 13.01 |
| Grate Area (sq ft / m2) | 25.50 / 2.37 |
| Evaporative Heating Surface (sq ft / m2) | 1918 / 178.25 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1918 / 178.25 |
| Evaporative Heating Surface/Cylinder Volume | 271.29 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4080 |
| Same as above plus superheater percentage | 4080 |
| Same as above but substitute firebox area for grate area | 22,400 |
| Power L1 | 4345 |
| Power MT | 348.33 |