Data from Park Benjamin (Ed), Appleton's Cyclopedia of Applied Mechanics (New York: D Appleton & Company, 1884), p. 341. Boiler pressure is an estimate.
Rogers built Forneys for a variety of commuter roads. This one was smaller than most of the ones whose owners Locobase can identify. The four locomotives with these power dimensions were two built for the Skaneatles railroad of upstate New York (#2 in 1870 was works number 1697 in January 1870, #3 in 1872 was works numbers 2043 in March 1872), the Chattanooga for the New Orleans Mobile & Chattanooga for their 5-foot gauge (works number 1828 in December 1870), and the Connecticut Western's #1 (works number 1869 in March 1871). One little design detail was the provision of a triptych-style cab window in which the center arched opening was taller than either of its flanking panes.
Principal Dimensions by Steve Llanso of Sweat House Media | |
|---|---|
| Class | Forney |
| Locobase ID | 10024 |
| Railroad | |
| Country | USA |
| Whyte | 2-4-4T |
| Number in Class | 4 |
| Road Numbers | |
| Gauge | Std |
| Number Built | 4 |
| Builder | Rogers |
| Year | 1870 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 6.50 / 1.98 |
| Engine Wheelbase (ft / m) | 25.71 / 7.84 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.25 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 40,000 / 18,144 |
| Engine Weight (lbs / kg) | 75,000 / 34,019 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 75,000 |
| Tender Water Capacity (gals / ML) | 1000 / 3.79 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 33 / 16.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 48.75 / 1240 |
| Boiler Pressure (psi / kPa) | 140 / 9.70 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15" x 22" / 381x559 |
| Tractive Effort (lbs / kg) | 12,083 / 5480.76 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.31 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 139 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 8.87 / 2.70 |
| Firebox Area (sq ft / m2) | 82 / 7.62 |
| Grate Area (sq ft / m2) | 11.84 / 1.10 |
| Evaporative Heating Surface (sq ft / m2) | 793 / 73.70 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 793 / 73.70 |
| Evaporative Heating Surface/Cylinder Volume | 176.22 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1658 |
| Same as above plus superheater percentage | 1658 |
| Same as above but substitute firebox area for grate area | 11,480 |
| Power L1 | 3041 |
| Power MT | 335.21 |