Firebox had thermic syphons. Relatively small Mountain types with small drivers for low-speed freight hauling. Originally listed weight on the drivers came to 204,000 lb. All 10 had the same boiler and firebox. Somehow the BAR managed to apply 7 different classifications to them.
7 delivered in 1929-1930, 2 more in 1935, and one more in 1945.
| Specifications | |
|---|---|
| Class | M |
| Locobase ID | 192 |
| Railroad | Bangor & Aroostook |
| Whyte | 4-8-2 |
| Road Numbers | 100-109 |
| Gauge | Std |
| Builder | Alco-Schenectady |
| Year | 1929 |
| Valve Gear | |
| Locomotive Length and Weight | |
| Driver Wheelbase | 16.50' |
| Engine Wheelbase | 38.08' |
| Ratio of driving wheelbase to overall engine wheebase | 0.43 |
| Overall Wheelbase (engine & tender) | 73.67' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 213360 lbs |
| Engine Weight | 317490 lbs |
| Tender Light Weight | 232000 lbs |
| Total Engine and Tender Weight | 549490 lbs |
| Tender Water Capacity | 10000 gals |
| Tender Fuel Capacity (oil/coal) | 15 tons |
| Minimum weight per yard of rail on which locomotive could run | 88.90 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 62" |
| Boiler Pressure | 240 psi |
| Cylinders (dia x stroke) | 22.5" x 30" |
| Tractive Effort | 49972 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.27 |
| Heating Ability | |
| Firebox Area | 351 sq. ft |
| Grate Area | 65.60 sq. ft |
| Evaporative Heating Surface | 3583 |
| Superheating Surface | 932 |
| Combined Heating Surface | 4515 |
| Evaporative Heating Surface/Cylinder Volume | 259.53 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 15744 |
| Same as above plus superheater percentage | 18993.92 |
| Same as above but substitute firebox area for grate area | 101629.08 |
| Power L1 | 24656.60 |
| Power MT | 1019.09 |
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