New York & Pennsylvania 4-4-0 "American" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 31 (Locobase 13224)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 36, p. 52. Works number was 36170 in February 1911.

Locobase 13223 describes this small NY-Pennsylvania shortline, which had an avid local ridership. This modestly scaled American contributed motive power for the 3-up and 3-down schedule.

Specifications by Steve Llanso of Sweat House Media
Locobase ID13224
RailroadNew York & Pennsylvania
Number in Class1
Road Numbers31
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase 9.08'
Engine Wheelbase23.08'
Ratio of driving wheelbase to overall engine wheebase 0.39
Overall Wheelbase (engine & tender)46.58'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers62500 lbs
Engine Weight101000 lbs
Tender Light Weight80000 lbs
Total Engine and Tender Weight181000 lbs
Tender Water Capacity4000 gals
Tender Fuel Capacity (oil/coal)8 tons
Minimum weight of rail (calculated)52 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter63"
Boiler Pressure160 psi
Cylinders (dia x stroke)18" x 24"
Tractive Effort16786 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.72
Heating Ability
Firebox Area141 sq. ft
Grate Area18.60 sq. ft
Evaporative Heating Surface1466 sq. ft
Superheating Surface
Combined Heating Surface1466 sq. ft
Evaporative Heating Surface/Cylinder Volume207.40
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2976
Same as above plus superheater percentage2976
Same as above but substitute firebox area for grate area22560
Power L15160
Power MT364.03

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