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


Class Details by Steve Llanso of Sweat House Media

Class B (Locobase 6656)

Data from the 1902 Manhattan Railway Company locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange; and DeGolyer, Volume 8, p 210. According to Brennan's history -- [], accessed 28 October 2005 -- Baldwin and Rhode Island Locomotive Works each produced ten engines. Baldwin's works numbers were 4350, 4353-4355, 4357, 4393, 4396-4397, 4401, 4407 in August 1878; road numbers were 36-40, 56-60. See

See Locobase 5040 for a more general discussion. The boiler pressure is an estimate as the diagrams do not give the figure.


Class C (Locobase 6657)

Data from the 1902 Manhattan Railway Company locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 9, p. 33. Baldwin's (Burnham, Parry, Williams & Co, at that point) works numbers were 4465, 4468-4470 in October 1878; 4471-4472, 4477, 4479, 4481-4482, 4484-4485, 4488 in November (road numbers 66-78). Rhode Island supplied the others as works numbers 733-738 in December 1878 and 739-744 in January 1879 (road numbers 61-65, 79-90).

See Locobase 5423 for a more general discussion. The boiler pressure is an estimate as the diagrams do not give the figure.

Principal Dimensions by Steve Llanso of Sweat House Media

ClassBC
Locobase ID6656 6657
RailroadNew York Elevated/Manhattan RailwayNew York Elevated/Manhattan Railway
CountryUSAUSA
Whyte0-4-4T0-4-4T
Number in Class2025
Road Numbers36-40, 56-6066-90
GaugeStdStd
Number Built2025
Builderseveralseveral
Year18791878
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)5 / 1.525 / 1.52
Engine Wheelbase (ft / m)15.08 / 4.60
Ratio of driving wheelbase to overall engine wheelbase 0.33
Overall Wheelbase (engine & tender) (ft / m)15.08 / 4.60
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)20,700 / 938924,800 / 11,249
Engine Weight (lbs / kg)35,000 / 15,87638,600 / 17,509
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)35,00038,600
Tender Water Capacity (gals / ML)450 / 1.80475 / 1.80
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 0.80 / 1 0.80 / 1
Minimum weight of rail (calculated) (lb/yd / kg/m)17 / 8.5021 / 10.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)38 / 96538 / 965
Boiler Pressure (psi / kPa)150 / 10.30150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)10" x 14" / 254x35610" x 14" / 254x356
Tractive Effort (lbs / kg)4697 / 2130.534697 / 2130.53
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.41 5.28
Heating Ability
Tubes (number - dia) (in / mm)100 - 1.5" / 38128 - 1.5" / 38
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 6.50 / 1.98 6.58 / 2.01
Firebox Area (sq ft / m2)40.50 / 3.7644 / 4.09
Grate Area (sq ft / m2)10 / 0.9310 / 0.93
Evaporative Heating Surface (sq ft / m2)273 / 25.37372 / 34.56
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)273 / 25.37372 / 34.56
Evaporative Heating Surface/Cylinder Volume214.96292.91
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation15001500
Same as above plus superheater percentage15001500
Same as above but substitute firebox area for grate area60756600
Power L135574428
Power MT757.67787.26

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