This is a slightly bigger design than the 1882 Rogers engine. In the diagram, the grate area is supposedly doubled to 36 sq ft. That seems unlikely, but there is no other information to go on. On the other hand, the diagram shows that the firebox is mounted above the driving axles and thus is wider.
Locobase can't match these to any entry on JF Webber's list of Dickson locomotives (conveyed to Locobase by Allen Stanley in March 2004).
| Specifications | ||
|---|---|---|
| Class | 31 | 38 |
| Locobase ID | 4944 | 4945 |
| Railroad | Norfolk & Southern | Norfolk & Southern |
| Whyte | 4-4-0 | 4-4-0 |
| Road Numbers | 38-39 | |
| Gauge | Std | Std |
| Builder | Rogers | Dickson |
| Year | 1882 | 1884 |
| Valve Gear | Stephenson | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 8.50' | 8.59' |
| Engine Wheelbase | 23.22' | 22.92' |
| Ratio of driving wheelbase to overall engine wheebase | 0.37 | 0.37 |
| Overall Wheelbase (engine & tender) | ||
| Axle Loading (Maximum Weight per Axle) | ||
| Weight on Drivers | 62500 lbs | 68100 lbs |
| Engine Weight | 94500 lbs | 92400 lbs |
| Tender Light Weight | ||
| Total Engine and Tender Weight | 0 | 0 |
| Tender Water Capacity | 3000 gals | 3800 gals |
| Tender Fuel Capacity (oil/coal) | ||
| Minimum weight per yard of rail on which locomotive could run | 52 lb rail | 57 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 68" | 68" |
| Boiler Pressure | 140 psi | 140 psi |
| Cylinders (dia x stroke) | 17" x 24" | 19" x 24" |
| Tractive Effort | 12138 lbs | 15162 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.15 | 4.49 |
| Heating Ability | ||
| Firebox Area | ||
| Grate Area | 18 sq. ft | 36 sq. ft |
| Evaporative Heating Surface | 1200 | 1234 |
| Superheating Surface | ||
| Combined Heating Surface | 1200 | 1234 |
| Evaporative Heating Surface/Cylinder Volume | 190.33 | 156.68 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 2520 | 5040 |
| Same as above plus superheater percentage | 2520 | 5040 |
| Same as above but substitute firebox area for grate area | 0 | 0 |
| Power L1 | 0 | 0 |
| Power MT | 0 | 0 |
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