Eureka-Nevada 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 7 (Locobase 15012)

Data from Roy V Wright (Ed.) 1922 Locomotive Cyclopedia of American Practice, Sixth Edition (New York: Simmons-Boardman Publishing Company, 1922), p. 1002. Works number was 5724 in August 1915.

This was a very small, very light locomotive for the standard gauge. It is described in the Locomotive Cyclopedia as being intended for passenger and freight service. After the E-N's mines closed in 1938, the 7 went to W Parker Lyon, who bought the engine for his Pony Express Museum in Alhambra, Calif. When Lyon died in 1955, his collection was broken, the 7 being sold in 1961 to William Harrah, who added it to his collection

The 7 was sold at auction in 1986 to the Silverwood Central railroad, a tourist operation in Athol, ID. Chet Wacsmuth of the SCR posted a note on the website of preserved locomotives on 29 July 2004 ([]) detailing the SCR's operation: "engine # 7 is doing quite well it makes 10 runs a day at Athol Idaho, its conversion to use used motor oil works quite well, it burns with a clear stack and hot ! one thing i would like to add is that when it was in bill harrah's collection he added fancy brass rings on the boiler, brass rings on the sanding domes and on the steam dome and the smoke stack. it ran from eureka nevada to palisades nevada between the mines,hauling miners and equipment until the mines closed around 1938."

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID15,012
Number in Class1
Road Numbers7
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 7.25 / 2.21
Engine Wheelbase (ft / m)28.33 / 8.63
Ratio of driving wheelbase to overall engine wheebase 0.26
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)33,500 / 15,195
Engine Weight (lbs / kg)44,000 / 19,958
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)19 / 9.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)36 / 914
Boiler Pressure (psi / kPa)170 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)12" x 16" / 305x406
Tractive Effort (lbs / kg)9248 / 4194.83
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.62
Heating Ability
Firebox Area (sq ft / m2)42.80 / 3.98
Grate Area (sq ft / m2)10.10 / 0.94
Evaporative Heating Surface (sq ft / m2)454 / 42.18
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)454 / 42.18
Evaporative Heating Surface/Cylinder Volume216.77
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1717
Same as above plus superheater percentage1717
Same as above but substitute firebox area for grate area7276
Power L13253
Power MT642.24

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Wes Barris