Lyon Hill & Company 2-8-2 "Mikado" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 3 (Locobase 15207)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 71, pp. 106+. See the story of the founding of this railway by the Spruce Production Division at Locobase 15206. Works numbers were 57589-57590 in December 1923.

Unlike the Prairie saddle-tank delivered a few months earlier (Locobase 15206), these oil-burning Mikados were full-size locomotives that, although described as in logging service and not equipped with all of the most up-to-date features (e.g., feed water heater, extra direct heating surface area, power reverse), were quite capable of running on common-carrier lines if necessary. Superheater area was more than adequate and dictated the use of 12" (305 mm) piston valves to admit the hotter steam to the cylinders.

They ran on 80 lb/yard (40 kg/metre) up 2% grades, and around 30 degree curves on the Olympic Peninsula between Tyee and Disque. Known as the Clallam County Railroad, whose ownership changed in 1925 to the Sol Luc Investment Company. 3 and 4 continued in service as Port Angeles Western locomotives

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID15,207
RailroadLyon Hill & Company
Number in Class2
Road Numbers3-4
Number Built2
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)14.50 / 4.42
Engine Wheelbase (ft / m)31.75 / 9.68
Ratio of driving wheelbase to overall engine wheebase 0.46
Overall Wheelbase (engine & tender) (ft / m)62.87 / 19.16
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)182,000 / 82,554
Engine Weight (lbs / kg)236,000 / 107,048
Tender Loaded Weight (lbs / kg)128,000 / 58,060
Total Engine and Tender Weight (lbs / kg)364,000 / 165,108
Tender Water Capacity (gals / ML)6000 / 22.73
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)2500 / 9.50
Minimum weight of rail (calculated) (lb/yd / kg/m)76 / 38
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)51 / 1295
Boiler Pressure (psi / kPa)185 / 12.80
High Pressure Cylinders (dia x stroke) (in / mm)23" x 28" / 584x711
Tractive Effort (lbs / kg)45,670 / 20715.59
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.99
Heating Ability
Firebox Area (sq ft / m2)186 / 17.28
Grate Area (sq ft / m2)63 / 5.85
Evaporative Heating Surface (sq ft / m2)3427 / 318.38
Superheating Surface (sq ft / m2)895 / 83.15
Combined Heating Surface (sq ft / m2)4322 / 401.53
Evaporative Heating Surface/Cylinder Volume254.52
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation11,655
Same as above plus superheater percentage14,103
Same as above but substitute firebox area for grate area41,636
Power L114,496
Power MT702.38

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