Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 29, p. 112. Works number was 28465 in June 1906.
This Scappoose, Ore timber line was owned by Chapman Lumber. Remarkably for a logging operation, the P & SW bored a tunnel through a mountain west of Chapman to reach the Nehalem Valley stands of timber.
When they bought this Praire, Chapman made sure Baldwin knew the maximum grade was 6% and curve radii could reach 35 degrees. An additional feature of this particular order was the provision of a standard 2" steam line from the locomotive boiler under the tender to a flexible pipe supplied by the company and capable of withstanding the normal working pressure of the boiler. This line supplied a steam engine mounted on a flat car.
The #1 operated on the P & SW for about a decade before being sold to Clark & Wilson Lumber Company of Goble, Oregon.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 1 |
| Locobase ID | 12979 |
| Railroad | Portland & Southwestern |
| Country | USA |
| Whyte | 2-6-2 |
| Number in Class | 1 |
| Road Numbers | 1 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Burnham, Williams & Co |
| Year | 1906 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 7.67 / 2.34 |
| Engine Wheelbase (ft / m) | 23.83 / 7.26 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.32 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 82,000 / 37,195 |
| Engine Weight (lbs / kg) | 107,000 / 48,534 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 3000 / 11.36 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1200 / 4542 |
| 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) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 16" x 24" / 406x610 |
| Tractive Effort (lbs / kg) | 21,364 / 9690.56 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.84 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 240 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 11.54 / 3.52 |
| Firebox Area (sq ft / m2) | 122 / 11.33 |
| Grate Area (sq ft / m2) | 16 / 1.49 |
| Evaporative Heating Surface (sq ft / m2) | 1561 / 145.07 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1561 / 145.07 |
| Evaporative Heating Surface/Cylinder Volume | 279.25 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2880 |
| Same as above plus superheater percentage | 2880 |
| Same as above but substitute firebox area for grate area | 21,960 |
| Power L1 | 5127 |
| Power MT | 413.53 |