Firebox had combustion chamber, which contributed 120 sq ft to overall firebox surface area and 39 sq ft of archtubes. When delivered, the working boiler pressure was set at 195 psi, which yielded a calculated 75,771 lb of tractive effort. Pressure was raised later to 200, then 210 psi.
Some of the class were refitted later with a firebox that had 100 sq ft of thermic syphons and 18 sq ft of arch tubes, which contributed to an overall total of 498 sq ft of firebox heating surface. At least two used security circulators in a firebox presenting 477 sq ft of direct heating surface. Like most 2-10-2s, these had 14"-diameter piston valves.
After service with the Atlantic Coast Line until 1951-1952, 9 of this class went on to serve with the C&IM as class H-2 until that line dieselized.
| Specifications | |
|---|---|
| Class | Q-1 |
| Locobase ID | 72 |
| Railroad | Atlantic Coast Line (ACL) |
| Whyte | 2-10-2 |
| Road Numbers | 2000-2019 |
| Gauge | Std |
| Builder | Baldwin |
| Year | 1925 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 22' |
| Engine Wheelbase | 42.80' |
| Ratio of driving wheelbase to overall engine wheebase | 0.51 |
| Overall Wheelbase (engine & tender) | 83.01' |
| Axle Loading (Maximum Weight per Axle) | 62780 lbs |
| Weight on Drivers | 303060 lbs |
| Engine Weight | 391380 lbs |
| Tender Light Weight | 221000 lbs |
| Total Engine and Tender Weight | 612380 lbs |
| Tender Water Capacity | 12000 gals |
| Tender Fuel Capacity (oil/coal) | 16 tons |
| Minimum weight per yard of rail on which locomotive could run | 101 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 63" |
| Boiler Pressure | 210 psi |
| Cylinders (dia x stroke) | 30" x 32" |
| Tractive Effort | 81600 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.71 |
| Heating Ability | |
| Firebox Area | 426 sq. ft |
| Grate Area | 88.20 sq. ft |
| Evaporative Heating Surface | 4975 |
| Superheating Surface | 1230 |
| Combined Heating Surface | 6205 |
| Evaporative Heating Surface/Cylinder Volume | 190.03 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 18522 |
| Same as above plus superheater percentage | 22226 |
| Same as above but substitute firebox area for grate area | 107352 |
| Power L1 | 15308 |
| Power MT | 556.79 |
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