Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 73, pp. 389+. Works number was 58419 in May 1925.
Small, superheated, oil-fired logging Mikado that served this Wallowa, Oregon timber harvester. Bear Creek was only the first. The engine was headed for tracks of 56 lb/yard (28 kg/metre), grades of up to 8%, and curves as tight as 30 degrees (radii of 193 feet/58.8 metres) and its front and rear trucks arranged to "traverse a maximum curvature of 35 degrees.". Its firebox was to be readily converted to burn coal.
After BCLC folded in 1934, the 4 was sold to Clark & Wilson Lumber Company of Goble, Ore as their #6. When the C&W sent it to its Portland & Southwestern in Scapoose, Ore, they renumbered #20 and put it to work along the Nehalem River.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 4 |
| Locobase ID | 15321 |
| Railroad | Bear Creek Logging Company |
| Country | USA |
| Whyte | 2-8-2T |
| Number in Class | 1 |
| Road Numbers | 4 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1925 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 11.50 / 3.51 |
| Engine Wheelbase (ft / m) | 25.92 / 7.90 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.44 |
| Overall Wheelbase (engine & tender) (ft / m) | 25.92 / 7.90 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 130,000 / 58,967 |
| Engine Weight (lbs / kg) | 169,000 / 76,657 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 169,000 |
| Tender Water Capacity (gals / ML) | 2000 / 7.58 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 800 / 3028 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 54 / 27 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 42 / 1067 |
| Boiler Pressure (psi / kPa) | 185 / 1280 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 24" / 457x610 |
| Tractive Effort (lbs / kg) | 29,114 / 13205.90 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.47 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 134 - 2" / 51 |
| Flues (number - dia) (in / mm) | 21 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 10.67 / 3.25 |
| Firebox Area (sq ft / m2) | 100 / 9.29 |
| Grate Area (sq ft / m2) | 27.70 / 2.57 |
| Evaporative Heating Surface (sq ft / m2) | 1156 / 107.43 |
| Superheating Surface (sq ft / m2) | 242 / 22.49 |
| Combined Heating Surface (sq ft / m2) | 1398 / 129.92 |
| Evaporative Heating Surface/Cylinder Volume | 163.51 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 5125 |
| Same as above plus superheater percentage | 5996 |
| Same as above but substitute firebox area for grate area | 21,645 |
| Power L1 | 7023 |
| Power MT | 476.40 |