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
Locobase ID15,374
RailroadManhattan Elevated
Number in Class20
Road Numbers
Number Built20
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)5
Engine Wheelbase (ft)16.08
Ratio of driving wheelbase to overall engine wheebase 0.31
Overall Wheelbase (engine & tender) (ft)16.08
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)33,000
Engine Weight (lbs)47,000
Tender Loaded Weight (lbs)
Total Engine and Tender Weight (lbs)47,000
Tender Water Capacity (gals)512
Tender Fuel Capacity (oil/coal) (gals/tons) 0.80
Minimum weight of rail (calculated) (lb/yd)28
Geometry Relating to Tractive Effort
Driver Diameter (in)42
Boiler Pressure (psi)140
High Pressure Cylinders (dia x stroke) (in)12" x 16"
Tractive Effort (lbs)6528
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.06
Heating Ability
Firebox Area (sq ft)54
Grate Area (sq ft)14
Evaporative Heating Surface (sq ft)546
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)546
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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