Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 62, p. 329. Works number was 51822 in May 1919.
Very small wood-burning logging Prairie suitable for the light (30 lb/yard, 15 kg/metre) rail of a South Carolina lumber company's tram line. The small scale is indicated by its total length of 15 miles (24.1 km).
The 4 would later work for the Beaufort County Lumber Company in North Carolina.
Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 52, pp. 338. Works number was 42199 in July 1915.
This Washington State logging company had its headquarters in Wahkiakum County. Its profile included maximum grades of 4% (partially compensated for curves) and average grades of 1 1/2-2%. Curves measured as tight as 25 degrees (207 foot/63 metre radii), and rails weighed 56 lb/yard.
Other than the use of oil fuel, this engine was typical of a medium-sized logging Prairie.
| Principal Dimensions by Steve Llanso of Middle Run Media | ||
|---|---|---|
| Class | 4 | 7 |
| Locobase ID | 14700 | 14303 |
| Railroad | Deep River Lumber Corporation | Deep River Logging Company |
| Country | USA | USA |
| Whyte | 2-6-2 | 2-6-2 |
| Number in Class | 1 | 1 |
| Road Numbers | 4 | 7 |
| Gauge | Std | Std |
| Number Built | 1 | 1 |
| Builder | Baldwin | Baldwin |
| Year | 1919 | 1915 |
| Valve Gear | Stephenson | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase (ft / m) | 7.83 / 2.39 | 9.17 / 2.80 |
| Engine Wheelbase (ft / m) | 20.58 / 6.27 | 24.67 / 7.52 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.38 | 0.37 |
| Overall Wheelbase (engine & tender) (ft / m) | 39.77 / 12.12 | 46.75 / 14.25 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | ||
| Weight on Drivers (lbs / kg) | 40,000 / 18,144 | 86,000 / 39,009 |
| Engine Weight (lbs / kg) | 55,000 / 24,948 | 111,000 / 50,349 |
| Tender Loaded Weight (lbs / kg) | 45,000 / 20,412 | 50,500 / 22,906 |
| Total Engine and Tender Weight (lbs / kg) | 100,000 / 45,360 | 161,500 / 73,255 |
| Tender Water Capacity (gals / ML) | 2000 / 7.58 | 2500 / 9.47 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1200 / 4542 | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 22 / 11 | 48 / 24 |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter (in / mm) | 36 / 914 | 44 / 1118 |
| Boiler Pressure (psi / kPa) | 180 / 1240 | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 12" x 16" / 305x406 | 16" x 24" / 406x610 |
| Tractive Effort (lbs / kg) | 9792 / 4441.58 | 21,364 / 9690.56 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.08 | 4.03 |
| Heating Ability | ||
| Tubes (number - dia) (in / mm) | 72 - 2" / 51 | 240 - 2" / 51 |
| Flues (number - dia) (in / mm) | ||
| Flue/Tube length (ft / m) | 10.08 / 3.07 | 11.87 / 3.62 |
| Firebox Area (sq ft / m2) | 53 / 4.92 | 118 / 10.96 |
| Grate Area (sq ft / m2) | 14 / 1.30 | 16 / 1.49 |
| Evaporative Heating Surface (sq ft / m2) | 430 / 39.95 | 1600 / 148.70 |
| Superheating Surface (sq ft / m2) | ||
| Combined Heating Surface (sq ft / m2) | 430 / 39.95 | 1600 / 148.70 |
| Evaporative Heating Surface/Cylinder Volume | 205.74 | 286.23 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 2520 | 2880 |
| Same as above plus superheater percentage | 2520 | 2880 |
| Same as above but substitute firebox area for grate area | 9540 | 21,240 |
| Power L1 | 3591 | 5171 |
| Power MT | 593.76 | 397.68 |