Data from "Fast Passenger Locomotive", American Journal of Railway Appliances and Railway Price Current, Volume 6, No 5 (30 January 1886), p. 71.
The AJRARPC report referred to T Everett Austin's presentation to the Engineers Club of Philadelphia, in which he described several such engines. Mason's superintendent John T Meats designed this pair, taking care "to increase the size of all wearing parts", carefully going over "new cylinders and all other working parts." The Journal predicted "we may expect from these engines as good performances as are possible to be gotten out of the standard American type."
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Express |
| Locobase ID | 16595 |
| Railroad | Mason |
| Country | USA |
| Whyte | 4-4-0 |
| Number in Class | 2 |
| Road Numbers | |
| Gauge | Std |
| Number Built | 2 |
| Builder | William Mason |
| Year | 1885 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 9 / 2.74 |
| Engine Wheelbase (ft / m) | 23.33 / 7.11 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.39 |
| Overall Wheelbase (engine & tender) (ft / m) | 21.92 / 6.68 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 68,000 / 30,844 |
| Engine Weight (lbs / kg) | 102,000 / 46,266 |
| Tender Loaded Weight (lbs / kg) | 60,000 / 27,216 |
| Total Engine and Tender Weight (lbs / kg) | 162,000 / 73,482 |
| Tender Water Capacity (gals / ML) | 2900 / 10.98 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 6 / 6 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 57 / 28.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 68.50 / 1740 |
| Boiler Pressure (psi / kPa) | 150 / 1030 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 24" / 457x610 |
| Tractive Effort (lbs / kg) | 14,474 / 6565.30 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.70 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 212 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 11.17 / 3.66 |
| Firebox Area (sq ft / m2) | |
| Grate Area (sq ft / m2) | 18.20 / 1.69 |
| Evaporative Heating Surface (sq ft / m2) | |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | |
| Evaporative Heating Surface/Cylinder Volume | |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2730 |
| Same as above plus superheater percentage | 2730 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |