Nahma & Northern 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 5 (Locobase 12929)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 43, p. 264. See also Charlie & Laurie MacIntosh's Nahma Inn web page at . Works number was 38816 in November 1912.

The Whiskey Northern added locomotives slowly to its UP of Michigan logging line. This logging Prairie was considerably smaller and lighter than the Ten-wheeler shown in Locobase 12928.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12,929
RailroadNahma & Northern
Number in Class1
Road Numbers5
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)8
Engine Wheelbase (ft)22.75
Ratio of driving wheelbase to overall engine wheebase 0.35
Overall Wheelbase (engine & tender) (ft)
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)58,000
Engine Weight (lbs)78,000
Tender Loaded Weight (lbs)44,000
Total Engine and Tender Weight (lbs)122,000
Tender Water Capacity (gals)2000
Tender Fuel Capacity (oil/coal) (gals/tons) 3.50
Minimum weight of rail (calculated) (lb/yd)32
Geometry Relating to Tractive Effort
Driver Diameter (in)42
Boiler Pressure (psi)180
High Pressure Cylinders (dia x stroke) (in)13" x 22"
Tractive Effort (lbs)13,544
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.28
Heating Ability
Firebox Area (sq ft)74
Grate Area (sq ft)13.30
Evaporative Heating Surface (sq ft)767
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)767
Evaporative Heating Surface/Cylinder Volume226.94
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2394
Same as above plus superheater percentage2394
Same as above but substitute firebox area for grate area13,320
Power L14239
Power MT483.38

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