Isle Royale Copper Company 2-8-2 "Mikado" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 14131)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 47, p. 315. Works number was 40115 in July 1913.

This side-tank Mikado was very similar in size and power to the Mogul delivered to the IRCC in 1908 and described in Locobase 13259. Its slightly smaller cylinder dimensions and boiler pressure, combined with an increase in adhesion weight, increased the factor of adhesion.

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID14131
RailroadIsle Royale Copper Company
Number in Class1
Road Numbers4
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.75 / 4.19
Engine Wheelbase (ft / m)28.83 / 8.79
Ratio of driving wheelbase to overall engine wheelbase 0.48
Overall Wheelbase (engine & tender) (ft / m)28.83 / 8.79
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)138,400 / 62,777
Engine Weight (lbs / kg)179,000 / 81,193
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)179,000
Tender Water Capacity (gals / ML)2500 / 9.47
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)58 / 29
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)51 / 1295
Boiler Pressure (psi / kPa)190 / 13.10
High Pressure Cylinders (dia x stroke) (in / mm)19" x 26" / 483x660
Tractive Effort (lbs / kg)29,722 / 13481.69
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.66
Heating Ability
Tubes (number - dia) (in / mm)280 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)11.33 / 3.45
Firebox Area (sq ft / m2)135 / 12.54
Grate Area (sq ft / m2)26.80 / 2.49
Evaporative Heating Surface (sq ft / m2)1785 / 165.83
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1785 / 165.83
Evaporative Heating Surface/Cylinder Volume209.26
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5092
Same as above plus superheater percentage5092
Same as above but substitute firebox area for grate area25,650
Power L14658
Power MT296.80

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Wes Barris