The firebox heating surface includes 5 arch tubes of 60 sq ft. Builder's work numbers were 63455-63456. 801 had 5 fewer tubes, which resulted in a total evaporative heating surface of 5,147 sq ft.
In the east, about the only job for which these big all-adhesion Mallets were suited was yard switching and that's what the B & M wanted them to do. After 7 years of work at the Mechanicville hump yard, however, the B & M sold them to the Bingham & Garfield copper mining road in Utah.
| Specifications | |
|---|---|
| Class | M-2-a |
| Locobase ID | 6942 |
| Railroad | Boston & Maine (B & M) |
| Whyte | 0-8-8-0 |
| Road Numbers | 800-801 |
| Gauge | Std |
| Builder | Alco-Schenectady |
| Year | 1922 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 14.75' |
| Engine Wheelbase | 40.29' |
| Ratio of driving wheelbase to overall engine wheebase | 0.37 |
| Overall Wheelbase (engine & tender) | 79' |
| Axle Loading (Maximum Weight per Axle) | 0 |
| Weight on Drivers | 474100 lbs |
| Engine Weight | 474100 lbs |
| Tender Light Weight | 219100 lbs |
| Total Engine and Tender Weight | 693200 lbs |
| Tender Water Capacity | 12000 gals |
| Tender Fuel Capacity (oil/coal) | 19 tons |
| Minimum weight per yard of rail on which locomotive could run | 99 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 51" |
| Boiler Pressure | 250 psi |
| Cylinders (dia x stroke) | 26" x 28" |
| Low Pressure Cylinders (dia x stroke) | 40" x 28" |
| Tractive Effort | 110885 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.28 |
| Heating Ability | |
| Firebox Area | 375 sq. ft |
| Grate Area | 77 sq. ft |
| Evaporative Heating Surface | 5215 |
| Superheating Surface | 1850 |
| Combined Heating Surface | 7065 |
| Evaporative Heating Surface/Cylinder Volume | 303.09 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 19250 |
| Same as above plus superheater percentage | 24255 |
| Same as above but substitute firebox area for grate area | 118125 |
| Power L1 | 12388 |
| Power MT | 460.85 |
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