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 ID12929
RailroadNahma & Northern
Number in Class1
Road Numbers5
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase8'
Engine Wheelbase22.75'
Ratio of driving wheelbase to overall engine wheebase 0.35
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers58000 lbs
Engine Weight78000 lbs
Tender Light Weight44000 lbs
Total Engine and Tender Weight122000 lbs
Tender Water Capacity2000 gals
Tender Fuel Capacity (oil/coal)3.5 tons
Minimum weight of rail (calculated)32 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter42"
Boiler Pressure180 psi
Cylinders (dia x stroke)13" x 22"
Tractive Effort13544 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.28
Heating Ability
Firebox Area74 sq. ft
Grate Area13.30 sq. ft
Evaporative Heating Surface767 sq. ft
Superheating Surface
Combined Heating Surface767 sq. ft
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 area13320
Power L14239
Power MT483.38

If you have any railroad data such as diagram books, rail station plans or anything else that you would be willing to share, please contact us.