Sierra Railway 2-8-2 "Mikado" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 34 (Locobase 14334)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 76, p.418+. Works number was 58679 in September 1925.

If the smaller Prairies and Consolidations that traveled from Eddystone to Jamestown, Calif were headed for the light track, this Mikado was destined for the heavier (56 lb/yard, 28 kg/metre) rail of the main line. Maximum grades were still 4%, but the curves had a somewhat less demanding maximum curve of 30 degrees.

Like the 28 (Locobase 14333), the 34 went into storage in 1955 as the Sierra replaced its steamers with diesels. In 1962, the railroad sold the 34 to Reed Hatch to run on Arizona's White Mountain Scenic Railroad.

It later returned to the Sierra Railroad and ran for several years before it was placed in storage.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID14,334
RailroadSierra Railway
Number in Class1
Road Numbers34
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)13.50 / 4.11
Engine Wheelbase (ft / m)28.75 / 8.76
Ratio of driving wheelbase to overall engine wheebase 0.47
Overall Wheelbase (engine & tender) (ft / m)56.83 / 17.32
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)140,000 / 63,503
Engine Weight (lbs / kg)174,000 / 78,925
Tender Loaded Weight (lbs / kg)114,000 / 51,710
Total Engine and Tender Weight (lbs / kg)288,000 / 130,635
Tender Water Capacity (gals / ML)5000 / 18.94
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)2500 / 9.50
Minimum weight of rail (calculated) (lb/yd / kg/m)58 / 29
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)46 / 1168
Boiler Pressure (psi / kPa)190 / 13.10
High Pressure Cylinders (dia x stroke) (in / mm)19" x 26" / 483x660
Tractive Effort (lbs / kg)32,953 / 14947.25
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.25
Heating Ability
Firebox Area (sq ft / m2)150 / 13.94
Grate Area (sq ft / m2)37.70 / 3.50
Evaporative Heating Surface (sq ft / m2)2195 / 203.92
Superheating Surface (sq ft / m2)489 / 45.43
Combined Heating Surface (sq ft / m2)2684 / 249.35
Evaporative Heating Surface/Cylinder Volume257.26
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation7163
Same as above plus superheater percentage8452
Same as above but substitute firebox area for grate area33,630
Power L112,542
Power MT790.01