Manhattan Elevated 0-4-4 "Forney" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class K2 (Locobase 15374)

Data from the 1902 Manhattan Railway Company locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Raildata collection. Works numbers were 1503-1522 in December 1893-February 1894.

See Locobase 5423 for a more general discussion.

Locobase uses an item in an 1894 issue of Locomotive Firemen's Magazine - p. 579 -- (taken from Railway Age) together with builder information from B Rumary's compilation supplied by Allen Stanley in March 2004 to piece together the details of this order. Produced in a batch in December 1893 & January-February 1894, these were the largest yet for the Manhattan, a fact attested to in the Railway Age item. The article also notes that the boiler combines a Belpaire firebox with an extended wagon top boiler. They were rated at 25 mph and could scale a 2 1/2% grade with 5 cars weighing a total of 72 1/2 tons.

(An earlier batch of 20 from Pittsburgh is outlined in Locobase 6660.)

The Rumary list shows that all were sold in 1904-1906, following the electrification of the system. Their post-Elevated lives included a variety of uses from street railway to lumber mill to small railway. Among the latter was the Pamilico, Oriental & Western, which bought the 242 in 1904 to serve as their #1.

Specifications by Steve Llanso of Sweat House Media
ClassK2
Locobase ID15374
RailroadManhattan Elevated
CountryUSA
Whyte0-4-4T
Number in Class20
Road Numbers
GaugeStd
Number Built20
BuilderPittsburgh
Year1893
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase5'
Engine Wheelbase16.08'
Ratio of driving wheelbase to overall engine wheebase 0.31
Overall Wheelbase (engine & tender)16.08'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers33000 lbs
Engine Weight47000 lbs
Tender Light Weight
Total Engine and Tender Weight47000 lbs
Tender Water Capacity512 gals
Tender Fuel Capacity (oil/coal)0.8 tons
Minimum weight of rail (calculated)28 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter42"
Boiler Pressure140 psi
Cylinders (dia x stroke)12" x 16"
Tractive Effort6528 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.06
Heating Ability
Firebox Area54 sq. ft
Grate Area14 sq. ft
Evaporative Heating Surface546 sq. ft
Superheating Surface
Combined Heating Surface546 sq. ft
Evaporative Heating Surface/Cylinder Volume260.70
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1960
Same as above plus superheater percentage1960
Same as above but substitute firebox area for grate area7560
Power L13818
Power MT510.14


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