Nevada Northern 2-8-2 "Mikado" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 5 (Locobase 9925)

Data from Charles Lake, Locomotives of 1907 (London: Percival Marshall & Co, 1907), presented on [], last accessed 31 January 2009, "Heavy Tank Locomotive-Nevada Northern Railway", Railway Master Mechanic, (February 1907), p. 56;, last accessed 31 January 2009.

The NN was projected and built by Mark Requa and opened in 1906.

According to Nevada Northern's site, this Mikado tank came new to the railroad and cost $15,371. It was the only one with this wheel arrangement o n the railroad and one of the few in the US. In all likelihood, the six axles were thought to allow higher weights on the 60-lb/yard (30-kg/metre) rail that served the NN throughout its operating history.

Obviously ill-suited to the NN's requirements, 5 was converted to a Consolidation tender engine in 1913 and renumbered 80. In the process, its cylinder size was increased by an inch as was its driver diameter. Its sizable tender held 7,500 US gallons(28,388 litres) of water and 12 tons (10.9 metric tonnes) of coal. In this configuration, 80 remained in service for almost 40 more years before being sold for scrap in May 1951.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID9925
RailroadNevada Northern
Number in Class1
Road Numbers5/80
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)15 / 4.57
Engine Wheelbase (ft / m)34 / 10.36
Ratio of driving wheelbase to overall engine wheebase 0.44
Overall Wheelbase (engine & tender) (ft / m)34 / 10.36
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)172,000 / 78,018
Engine Weight (lbs / kg)225,000 / 102,058
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)225,000
Tender Water Capacity (gals / ML)2500 / 9.47
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)5 / 4.50
Minimum weight of rail (calculated) (lb/yd / kg/m)72 / 36
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 1219
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)19" x 26" / 483x660
Tractive Effort (lbs / kg)33,242 / 15078.34
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.17
Heating Ability
Firebox Area (sq ft / m2)166 / 15.42
Grate Area (sq ft / m2)46 / 4.27
Evaporative Heating Surface (sq ft / m2)2644 / 245.63
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2644 / 245.63
Evaporative Heating Surface/Cylinder Volume309.89
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation9200
Same as above plus superheater percentage9200
Same as above but substitute firebox area for grate area33,200
Power L16515
Power MT334.03

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