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


Class Details by Steve Llanso of Sweat House Media

Class B (Locobase 5040)

Data from "'Forney' Locomotive for the New York elevated Railroad," Scientific American, Volume XXXIX [39], New series, No 21 (23 November 1878), p.319; and John H White, Jr, "Spunky Little Devils"Locomotives of the New York Elevated," Locomotive and Railroad History Bulletin 162, See Locobase 5423 for a more general discussion. Works numbers were 710-714 in August 1878 and 720-724 in September.

Some of the hundreds of 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.


Class D / D2 (Locobase 15371)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 9, p. 103. See also http://arrts-arrchives.com/RAPIDTRANSIT.html, 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.

Specifications by Steve Llanso of Sweat House Media
ClassBD / D2
Locobase ID5040 15,371
RailroadNew York ElevatedNew York Elevated
CountryUSAUSA
Whyte0-4-4T0-4-4T
Number in Class17
Road Numbers45, 41-44, 61-6597-113
GaugeStdStd
Number Built17
BuilderRhode Islandseveral
Year18781879
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 5.50 / 1.685 / 1.52
Engine Wheelbase (ft / m)16 / 4.8816.08 / 4.90
Ratio of driving wheelbase to overall engine wheebase 0.34 0.31
Overall Wheelbase (engine & tender) (ft / m)16.08 / 4.90
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)19,170 / 869521,000 / 9525
Engine Weight (lbs / kg)29,890 / 13,55831,500 / 14,288
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)29,89031,500
Tender Water Capacity (gals / ML)500 / 1.89450 / 1.70
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)16 / 818 / 9
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)38 / 96542 / 1067
Boiler Pressure (psi / kPa)130 / 9130 / 9
High Pressure Cylinders (dia x stroke) (in / mm)10" x 14" / 254x35610" x 16" / 254x406
Tractive Effort (lbs / kg)4071 / 1846.584210 / 1909.63
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.71 4.99
Heating Ability
Firebox Area (sq ft / m2)57 / 5.3047.50 / 4.41
Grate Area (sq ft / m2)10 / 0.9310.30 / 0.96
Evaporative Heating Surface (sq ft / m2)297 / 27.59387 / 35.95
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)297 / 27.59387 / 35.95
Evaporative Heating Surface/Cylinder Volume233.37266.08
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation13001339
Same as above plus superheater percentage13001339
Same as above but substitute firebox area for grate area74106175
Power L137653907
Power MT865.98820.33