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 ID13,224
RailroadNew York & Pennsylvania
Number in Class1
Road Numbers31
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft) 9.08
Engine Wheelbase (ft)23.08
Ratio of driving wheelbase to overall engine wheebase 0.39
Overall Wheelbase (engine & tender) (ft)46.58
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)62,500
Engine Weight (lbs)101,000
Tender Loaded Weight (lbs)80,000
Total Engine and Tender Weight (lbs)181,000
Tender Water Capacity (gals)4000
Tender Fuel Capacity (oil/coal) (gals/tons)8
Minimum weight of rail (calculated) (lb/yd)52
Geometry Relating to Tractive Effort
Driver Diameter (in)63
Boiler Pressure (psi)160
High Pressure Cylinders (dia x stroke) (in)18" x 24"
Tractive Effort (lbs)16,786
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.72
Heating Ability
Firebox Area (sq ft)141
Grate Area (sq ft)18.60
Evaporative Heating Surface (sq ft)1466
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)1466
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 area22,560
Power L15160
Power MT364.03

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