A unique engine on the Pennsy, a simple-expansion articulated built at a time when all other articulateds were Mallet compounds. In a departure from Pennsylvania practice, this engine used a wagon-top boiler with the longest tubes of any engine in Locobase. Note the low boiler pressure. She operated in pusher service until 1928.
| Specifications | |
|---|---|
| Class | HH1s |
| Locobase ID | 325 |
| Railroad | Pennsylvania (PRR) |
| Whyte | 2-8-8-2 |
| Road Numbers | 3396 |
| Gauge | Std |
| Builder | Alco |
| Year | 1911 |
| Valve Gear | |
| Locomotive Length and Weight | |
| Driver Wheelbase | 41.83' |
| Engine Wheelbase | 57.41' |
| Ratio of driving wheelbase to overall engine wheebase | 0.73 |
| Overall Wheelbase (engine & tender) | 88.09' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 435501 lbs |
| Engine Weight | 482999 lbs |
| Tender Light Weight | 185999 lbs |
| Total Engine and Tender Weight | 668998 lbs |
| Tender Water Capacity | 9000 gals |
| Tender Fuel Capacity (oil/coal) | 30 tons |
| Minimum weight per yard of rail on which locomotive could run | 90.73 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 56" |
| Boiler Pressure | 160 psi |
| Cylinders (dia x stroke) | 27" x 28" (4) |
| Tractive Effort | 99144 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.39 |
| Heating Ability | |
| Firebox Area | 405.05 sq. ft |
| Grate Area | 96.55 sq. ft |
| Evaporative Heating Surface | 6125 |
| Superheating Surface | 1257 |
| Combined Heating Surface | 7382 |
| Evaporative Heating Surface/Cylinder Volume | 165.05 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 15448 |
| Same as above plus superheater percentage | 18078.47 |
| Same as above but substitute firebox area for grate area | 75843.45 |
| Power L1 | 7832.14 |
| Power MT | 317.19 |
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