A Prairie Mallet tank for a logging road and one of three of the wheel arrangement (the other two were tender engines) bought by the company in 1910. They operated over 26 miles of 1% to 5% grade over 30-deg curves pulling 385 tons. (The maximum gradient was later reduced to 3.33%.) The tank version was the first tank Mallet built for use in North America.
Wiener singles out the design, saying "They deserve far more than a mere passing mention, because they were so well thought out and designed that the type has remained unchanged until this [1930] day, except for the adoption of ...superheaters and arch tubes ...which tend to increase efficiency or to reduce maintenance costs." At some point the balloon stack was replaced by a straight pipe.
http://loggingmallets.railfan.net tells us that Booth Lumber #2 carried on until 1945 and was scrapped a year later in Wendling, Oregon.
| Specifications | |
|---|---|
| Class | 2 |
| Locobase ID | 3644 |
| Railroad | Booth-Kelly |
| Whyte | 2-6-6-2T |
| Road Numbers | 2 |
| Gauge | Std |
| Builder | Baldwin |
| Year | 1910 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 8' |
| Engine Wheelbase | 23.67' |
| Ratio of driving wheelbase to overall engine wheebase | 0.34 |
| Overall Wheelbase (engine & tender) | 23.67' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 177200 lbs |
| Engine Weight | 205950 lbs |
| Tender Light Weight | |
| Total Engine and Tender Weight | 205950 lbs |
| Tender Water Capacity | 2000 gals |
| Tender Fuel Capacity (oil/coal) | 1000 gals |
| Minimum weight per yard of rail on which locomotive could run | 49 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 44" |
| Boiler Pressure | 200 psi |
| Cylinders (dia x stroke) | 17" x 24" |
| Low Pressure Cylinders (dia x stroke) | 26" x 24" |
| Tractive Effort | 37545 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.72 |
| Heating Ability | |
| Firebox Area | 132 sq. ft |
| Grate Area | 26.30 sq. ft |
| Evaporative Heating Surface | 2089 |
| Superheating Surface | |
| Combined Heating Surface | 2089 |
| Evaporative Heating Surface/Cylinder Volume | 331.32 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 5260 |
| Same as above plus superheater percentage | 5260 |
| Same as above but substitute firebox area for grate area | 26400 |
| Power L1 | 2734 |
| Power MT | 204.09 |
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