The 1947 B & M Steam Locomotives Description and Classification, supplied in May 2005 by Allen Stanley from his extensive collection, shows that the S-1c rebuild was relatively minor -- some were fitted with Elesco or Worthington feedwater heaters and others refitted with a copper firebox of identical dimensions to the original. They did shed some weight, however, compared to the oafish S-1as.
| Specifications | |
|---|---|
| Class | S-1-a/S-1-b |
| Locobase ID | 2384 |
| Railroad | Boston & Maine |
| Whyte | 2-10-2 |
| Road Numbers | 3000-3029 |
| Gauge | Std |
| Builder | Alco-Schenectady |
| Year | 1920 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 21.83' |
| Engine Wheelbase | 39.58' |
| Ratio of driving wheelbase to overall engine wheebase | 0.55 |
| Overall Wheelbase (engine & tender) | 79.50' |
| Axle Loading (Maximum Weight per Axle) | 68100 lbs |
| Weight on Drivers | 320400 lbs |
| Engine Weight | 377800 lbs |
| Tender Light Weight | 206000 lbs |
| Total Engine and Tender Weight | 583800 lbs |
| Tender Water Capacity | 12000 gals |
| Tender Fuel Capacity (oil/coal) | 16 tons |
| Minimum weight per yard of rail on which locomotive could run | 107 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 61" |
| Boiler Pressure | 190 psi |
| Cylinders (dia x stroke) | 29" x 32" |
| Tractive Effort | 71251 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.50 |
| Heating Ability | |
| Firebox Area | 364 sq. ft |
| Grate Area | 80.30 sq. ft |
| Evaporative Heating Surface | 4646 |
| Superheating Surface | 1145 |
| Combined Heating Surface | 5791 |
| Evaporative Heating Surface/Cylinder Volume | 189.91 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 15257 |
| Same as above plus superheater percentage | 18308 |
| Same as above but substitute firebox area for grate area | 82992 |
| Power L1 | 13242 |
| Power MT | 455.58 |
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