Rebuilt from the Richmond, which blew up 19 days after it entered service on the Reading in September 1844. The incident, blamed by one authority on a lightning strike, was later more plausibly attributed to defective feed-water pumps leading to low water over the crown sheet. The Philadelphia, which drove on the rear axle rather than on the middle one as had Richmond, was turned out by noted designer James Milholland. In addition to the 2" tubes shown, the boiler also held four 1 3/4" tubes.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Philadelphia |
| Locobase ID | 2547 |
| Railroad | Philadelphia & Reading |
| Country | USA |
| Whyte | 0-6-0 |
| Number in Class | 1 |
| Road Numbers | |
| Gauge | Std |
| Number Built | 1 |
| Builder | Norris |
| Year | 1849 |
| Valve Gear | V-hook |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 7.70 / 2.35 |
| Engine Wheelbase (ft / m) | |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | |
| Engine Weight (lbs / kg) | |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 46 / 1168 |
| Boiler Pressure (psi / kPa) | 120 / 830 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 14.5" x 20" / 368x508 |
| Tractive Effort (lbs / kg) | 9324 / 4229.30 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 127 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 11.70 / 3.57 |
| Firebox Area (sq ft / m2) | 48 / 4.46 |
| Grate Area (sq ft / m2) | 11.40 / 1.06 |
| Evaporative Heating Surface (sq ft / m2) | 848 / 78.81 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 848 / 78.81 |
| Evaporative Heating Surface/Cylinder Volume | 221.99 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1368 |
| Same as above plus superheater percentage | 1368 |
| Same as above but substitute firebox area for grate area | 5760 |
| Power L1 | 2620 |
| Power MT | |