Class unknown (Locobase 1027) 
Based on a description published by Paul R Hodge (who may have designed it) in 1840. He claimed that the engine had pulled a 220-ton load at 14 miles up a slope. See White (1968), 280-286.
| Principal Dimensions by Steve Llanso of Sweat House Media | |
|---|---|
| Class | unknown |
| Locobase ID | 1027 |
| Railroad | |
| Country | USA |
| Whyte | 4-2-0 |
| Number in Class | |
| Road Numbers | |
| Gauge | Std |
| Number Built | |
| Builder | HR Dunham & Co. |
| Year | 1837 |
| Valve Gear | |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | |
| Ratio of driving wheelbase to overall engine wheebase | |
| 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 / ML/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 54 / 1372 |
| Boiler Pressure (psi / kPa) | 50 / 3.40 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 10.5" x 16" / 267x406 |
| Tractive Effort (lbs / kg) | 1388 / 629.59 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | |
| Heating Ability | |
| Firebox Area (sq ft / m2) | |
| Grate Area (sq ft / m2) | 9 / 0.84 |
| 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 | 450 |
| Same as above plus superheater percentage | 450 |
| Same as above but substitute firebox area for grate area | |
| Power L1 | |
| Power MT | |