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 ID15,371 5040
RailroadNew York ElevatedNew York Elevated
Number in Class17
Road Numbers97-11345
Number Built17
BuilderseveralRhode Island
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)55
Engine Wheelbase (ft)16.0816
Ratio of driving wheelbase to overall engine wheebase 0.31 0.31
Overall Wheelbase (engine & tender) (ft)16.08
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)21,00028,000
Engine Weight (lbs)31,50040,000
Tender Loaded Weight (lbs)
Total Engine and Tender Weight (lbs)31,50040,000
Tender Water Capacity (gals)450500
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)1823
Geometry Relating to Tractive Effort
Driver Diameter (in)4242
Boiler Pressure (psi)130150
High Pressure Cylinders (dia x stroke) (in)10" x 16"11" x 16"
Tractive Effort (lbs)42105877
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.99 4.76
Heating Ability
Firebox Area (sq ft)47.50
Grate Area (sq ft)10.309
Evaporative Heating Surface (sq ft)387400
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)387400
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 area6175
Power L13907
Power MT820.33

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