Data from "Oil-Burning Locomotives", Record of Recent Construction #37 (Baldwin Locomotive Works, 1911), p. 24. See also DeGolyer, Volume 39, p. 27. (Thanks to Chris Hohl for his 30 June 2021 email correcting the valve gear.) Works number was 36570 was in May 1911.
This logger operated in Oregon, first for the CRBL - headquartered in Blind Slough, Ore --, then for Larkins Green Lumber Company. Baldwin's specs required the engine to scale 8% grades, negotiate 50-deg curves on relatively robust 60-lb/yard (30-kg/metre) rails. The tight curvatures meant that both trucks were allowed a generous 6 1/4 inches of traverse to each side.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Siwash |
| Locobase ID | 11059 |
| Railroad | Columbia River Belt Line |
| Country | USA |
| Whyte | 2-6-2ST |
| Number in Class | 1 |
| Road Numbers | |
| Gauge | Std |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1911 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 9 / 2.74 |
| Engine Wheelbase (ft / m) | 23.50 / 7.16 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.38 |
| Overall Wheelbase (engine & tender) (ft / m) | 23.50 / 7.16 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 85,400 / 38,737 |
| Engine Weight (lbs / kg) | 119,600 / 54,250 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 119,600 |
| Tender Water Capacity (gals / ML) | 1200 / 4.55 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 450 / 1703 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 47 / 23.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 44 / 1118 |
| Boiler Pressure (psi / kPa) | 165 / 1140 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 17" x 22" / 432x559 |
| Tractive Effort (lbs / kg) | 20,266 / 9192.51 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.21 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 208 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 11 / 3.35 |
| Firebox Area (sq ft / m2) | 93 / 8.64 |
| Grate Area (sq ft / m2) | 14.40 / 1.34 |
| Evaporative Heating Surface (sq ft / m2) | 1282 / 119.14 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1282 / 119.14 |
| Evaporative Heating Surface/Cylinder Volume | 221.80 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2376 |
| Same as above plus superheater percentage | 2376 |
| Same as above but substitute firebox area for grate area | 15,345 |
| Power L1 | 3657 |
| Power MT | 283.22 |