Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 48, p. 257 and Volume 62, pp. 366+. Works numbers were 40539 in September 1913 and 52854 in January 1920.
As in many Baldwin logging locomotives, the specs called for "Spring rigging to be extra heavy for rough service."
17, which was ordered six years after the 7, burned oil and trailed a tender holding 1,500 gallons (5,678 litres) of oil. She also put a little more weight on the drivers (68,000 lb/30,844 kg) and had a total engine weight of 89,000 lb (40,370 kg).
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 7 |
| Locobase ID | 14147 |
| Railroad | Lufkin Land & Lumber Company |
| Country | USA |
| Whyte | 2-6-2 |
| Number in Class | 2 |
| Road Numbers | 7, 17 |
| Gauge | Std |
| Number Built | 2 |
| Builder | Baldwin |
| Year | 1914 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 9.17 / 2.80 |
| Engine Wheelbase (ft / m) | 23.75 / 7.24 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.39 |
| Overall Wheelbase (engine & tender) (ft / m) | 50 / 15.24 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 64,000 / 29,030 |
| Engine Weight (lbs / kg) | 86,000 / 39,009 |
| Tender Loaded Weight (lbs / kg) | 60,000 / 27,216 |
| Total Engine and Tender Weight (lbs / kg) | 146,000 / 66,225 |
| Tender Water Capacity (gals / ML) | 3000 / 11.36 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 5 / 5 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 36 / 18 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 44 / 1118 |
| Boiler Pressure (psi / kPa) | 175 / 1210 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15" x 20" / 381x508 |
| Tractive Effort (lbs / kg) | 15,213 / 6900.51 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.21 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 147 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 11.87 / 3.62 |
| Firebox Area (sq ft / m2) | 87 / 8.08 |
| Grate Area (sq ft / m2) | 14.10 / 1.31 |
| Evaporative Heating Surface (sq ft / m2) | 995 / 92.44 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 995 / 92.44 |
| Evaporative Heating Surface/Cylinder Volume | 243.28 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2468 |
| Same as above plus superheater percentage | 2468 |
| Same as above but substitute firebox area for grate area | 15,225 |
| Power L1 | 4487 |
| Power MT | 463.69 |