Unspecified 2-4-4 Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Forney (Locobase 10024)

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

Locobase ID10024
Number in Class4
Road Numbers
Number Built4
Valve GearStephenson
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 Volume176.22
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1658
Same as above plus superheater percentage1658
Same as above but substitute firebox area for grate area11,480
Power L13041
Power MT335.21

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