New York Elevated 0-4-4 "Forney" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class D / D2 (Locobase 15371)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 9, p. 103. See also, last accessed 7 November 2010 and F J Camulla, "The New York Elevated Railroads," Industries and Iron, Volume 1 (24 December 1886), p. 662-663. Baldwin works numbers were 4539-4542, 4544-4546, 4548 in February 1879; 4550, 4552, 4567-4573 in March. Rhode Island's works numbers were 745-747 in February 1879 and 748-762 in March.

After 25 years of service, the lines were electrified and the Forneys were sold in 1903-1904 to locomotive rebuilder/reseller Birmingham Rail & Locomotive. BR&L found new homes for the entire class in lumbering, a kind of railroading that suited the low axle loadings and starting-traction power of the 0-4-4T arrangement.

Class unknown (Locobase 5040)

One of hundreds Matthias Forney tanks designed for rapid acceleration over short distances. A straight boiler rode over the two driving axles and the firebox dropped behind the rear driving axle and in front of the bogie truck under the tank.

See Locobase 5423 for a more general discussion.

Specifications by Steve Llanso of Sweat House Media
ClassD / D2unknown
Locobase ID15371 5040
RailroadNew York ElevatedNew York Elevated
Number in Class17
Road Numbers97-11345
Number Built17
BuilderseveralRhode Island
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase5'5'
Engine Wheelbase16.08'16'
Ratio of driving wheelbase to overall engine wheebase 0.31 0.31
Overall Wheelbase (engine & tender)16.08'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers21000 lbs28000 lbs
Engine Weight31500 lbs40000 lbs
Tender Light Weight
Total Engine and Tender Weight31500 lbs40000 lbs
Tender Water Capacity450 gals500 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)18 lb/yard23 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter42"42"
Boiler Pressure130 psi150 psi
Cylinders (dia x stroke)10" x 16"11" x 16"
Tractive Effort4210 lbs5877 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.99 4.76
Heating Ability
Firebox Area47.50 sq. ft
Grate Area10.30 sq. ft9 sq. ft
Evaporative Heating Surface387 sq. ft400 sq. ft
Superheating Surface
Combined Heating Surface387 sq. ft400 sq. ft
Evaporative Heating Surface/Cylinder Volume266.08227.29
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation13391350
Same as above plus superheater percentage13391350
Same as above but substitute firebox area for grate area61750
Power L139070
Power MT820.330

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