Nahma & Northern / Nevada Northern 4-6-0 "Ten-wheeler" Locomotives of the USA


Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 12928)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 28, p. 253. See also Charlie & Laurie MacIntosh's Nahma Inn web page at http://www.nahmainn.com/History.php . Works number was 29721 in December 1906.

The buyer was credited as Bay De Noquet Lumber Company, which reflects the railroad's geographical location in Michigan's Upper Peninsula. Nahma (pronounced NAY-muh) sits on the south-facing bay near the head of Lake Michigan. The 4 made up part of the N & N's roster after the railroad began exploiting hardwood forests to the North. Ultimately, the N & N (aka the Whiskey Northern) encompassed 75 miles of track. Logging continued for almost 50 years before the railroad was abandoned in 1948.


Class R E Noble (Locobase 13685)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 35, p.144. Works number was 34942 in July 1910.

This surprisingly high-drivered Ten-wheeler was bought by American Smelters Company for $13,139. After 30 years of service, the engine was retired in 1941.

In 1956, the NN revived the 40 to conduct railfan trips. In 1986, the NN donated the 40 to the State of Nevada in September 1986. The Nevada Northern Railway Museum operated the engine for a while, but ran into boiler life issues in 2001. http://www.nnry.com/40Rebuild/40Rebuild.htm, last accessed on 7 January 2012, narrates the long-running effort to restore the 40 to service. The work resulted in the "Ghost Train of Ely" returning to service in 2005.

Taken out of service in 2008 because of suspected cracks in the axles, the 40 sat cold until later analysis determined that the axles did not have actual cracks and thus could be operated safely. At the time of the 40's reappearance on the operational roster, however, the Museum understood that a $425,000-450,000 kitty needed to be assembled to completely overhaul the running gear. (See the director's 23 September 2009 At the Throttle presented at http://nevadanorthernrailway.net/throttle/throttle092309.htm)

Specifications by Steve Llanso of Sweat House Media
Class4R E Noble
Locobase ID12928 13685
RailroadNahma & NorthernNevada Northern
CountryUSAUSA
Whyte4-6-04-6-0
Number in Class11
Road Numbers440
GaugeStdStd
Number Built11
BuilderBurnham, Williams & CoBaldwin
Year19061910
Valve GearStephensonBaker
Locomotive Length and Weight
Driver Wheelbase10.50'13.33'
Engine Wheelbase18.42'24.50'
Ratio of driving wheelbase to overall engine wheebase 0.57 0.54
Overall Wheelbase (engine & tender)50.58'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers76000 lbs102500 lbs
Engine Weight88000 lbs137400 lbs
Tender Light Weight60000 lbs120000 lbs
Total Engine and Tender Weight148000 lbs257400 lbs
Tender Water Capacity3000 gals6000 gals
Tender Fuel Capacity (oil/coal)10 tons
Minimum weight of rail (calculated)42 lb/yard57 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter50"69"
Boiler Pressure180 psi200 psi
Cylinders (dia x stroke)16" x 24"19" x 26"
Tractive Effort18801 lbs23125 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.04 4.43
Heating Ability
Firebox Area92 sq. ft145 sq. ft
Grate Area20 sq. ft29.30 sq. ft
Evaporative Heating Surface1222 sq. ft2048 sq. ft
Superheating Surface
Combined Heating Surface1222 sq. ft2048 sq. ft
Evaporative Heating Surface/Cylinder Volume218.80240.03
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation36005860
Same as above plus superheater percentage36005860
Same as above but substitute firebox area for grate area1656029000
Power L145177475
Power MT393.09482.33


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