Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 71, pp. 341+. See also the Oregon Coast chapter of the National Railway Historical Society's description of the 104 at [], last accessed 4 June 2013. Works number was 55480 in June 1922.
Essentially a sister to the Pacific States 9 shown in Locobase 15233, the 104 was also a superheated logging Mikado, but burned oil fuel instead of coal and operated on the Coos Bay in Powers, Oregon. The railroad featured 60 lb/yard (30 kg/metre) rail arcing around relatively gentle 11 degree (radii of 521 ft/159 m) curves and climbing ruling grades of 2%. This engine had 8" (203 mm) piston valves.
Like many such engines, the 104 enjoyed a long career, passing to Coos Bay's successor Georgia Pacific in 1956 as their 3. The engine was donated to the Coos-Curry Pioneer & Historical Association in 1960 and was put on display. The OCHR began restoring the 104 in the late 1990s and eventually moved the 104 to a new location.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 104 |
| Locobase ID | 15234 |
| Railroad | Coos Bay Lumber Company |
| Country | USA |
| Whyte | 2-8-2 |
| Number in Class | 1 |
| Road Numbers | 104 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1922 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12 / 3.66 |
| Engine Wheelbase (ft / m) | 27.58 / 8.41 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.44 |
| Overall Wheelbase (engine & tender) (ft / m) | 50.79 / 15.48 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 116,500 / 52,844 |
| Engine Weight (lbs / kg) | 145,500 / 65,998 |
| Tender Loaded Weight (lbs / kg) | 93,000 / 42,184 |
| Total Engine and Tender Weight (lbs / kg) | 238,500 / 108,182 |
| Tender Water Capacity (gals / ML) | 4200 / 15.91 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1600 / 6056 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 49 / 24.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 44 / 1118 |
| Boiler Pressure (psi / kPa) | 185 / 1280 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 24" / 457x610 |
| Tractive Effort (lbs / kg) | 27,790 / 12605.35 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.19 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 164 - 2" / 51 |
| Flues (number - dia) (in / mm) | 24 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 12.08 / 3.68 |
| Firebox Area (sq ft / m2) | 141 / 13.10 |
| Grate Area (sq ft / m2) | 25.50 / 2.37 |
| Evaporative Heating Surface (sq ft / m2) | 1576 / 146.47 |
| Superheating Surface (sq ft / m2) | 328 / 30.48 |
| Combined Heating Surface (sq ft / m2) | 1904 / 176.95 |
| Evaporative Heating Surface/Cylinder Volume | 222.91 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4718 |
| Same as above plus superheater percentage | 5519 |
| Same as above but substitute firebox area for grate area | 30,519 |
| Power L1 | 10,042 |
| Power MT | 760.13 |
