Firebox had 3 thermic syphons (84 sq ft) and a combustion chamber (64 sq ft), which together contributed 148 sq ft to the firebox heating surface. Small Mountain for this northernmost American railroad. Indeed, it is one of only 3 North American standard gauge 4-8-2s in Locobase with an adhesion weight under 200,000 lb. (The others are the 1914 Canadian Pacific I1 class found in Locobase 4258 and the New Orleans Great Northern 200 at Locobase 6909)
Built in Philadelphia, the engines were taken apart and shipped up to Anchorage, where they were reassembled in the shops. 801 (works number 61736 in May 1932) was completed in 1932. It was wrecked twice, once in 1942 and once in 1950.
802 (works number 64366) entered service on 5 December 1942 and ran until dieselization led to its retirement and scrapping in April 1954.
| Specifications | |
|---|---|
| Class | 801 |
| Locobase ID | 5094 |
| Railroad | Alaska Railroad |
| Whyte | 4-8-2 |
| Road Numbers | 801-802 |
| Gauge | Std |
| Builder | Baldwin |
| Year | 1932 |
| Valve Gear | Baker |
| Locomotive Length and Weight | |
| Driver Wheelbase | 16.50' |
| Engine Wheelbase | 38.50' |
| Ratio of driving wheelbase to overall engine wheebase | 0.43 |
| Overall Wheelbase (engine & tender) | 73.29' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 190850 lbs |
| Engine Weight | 273300 lbs |
| Tender Light Weight | 200300 lbs |
| Total Engine and Tender Weight | 473600 lbs |
| Tender Water Capacity | 10000 gals |
| Tender Fuel Capacity (oil/coal) | 14 tons |
| Minimum weight per yard of rail on which locomotive could run | 80 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 63" |
| Boiler Pressure | 220 psi |
| Cylinders (dia x stroke) | 22" x 30" |
| Tractive Effort | 43099 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.43 |
| Heating Ability | |
| Firebox Area | 416 sq. ft |
| Grate Area | 62.50 sq. ft |
| Evaporative Heating Surface | 2870 |
| Superheating Surface | 706 |
| Combined Heating Surface | 3576 |
| Evaporative Heating Surface/Cylinder Volume | 217.44 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 13750 |
| Same as above plus superheater percentage | 16500 |
| Same as above but substitute firebox area for grate area | 109824 |
| Power L1 | 19783 |
| Power MT | 914.10 |
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