Lehigh & Hudson River 2-8-2 "Mikado" Locomotives in the USA

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Class Details by Steve Llanso of Sweat House Media

Class 70 (Locobase 14531)

Data from DeGolyer, Vol 55, pp. 13+. Works numbers were 43062-43063, 43079-43080 in March 1916.

Bearing a 9 1/2-foot wide Wootten firebox, the 70s were nevertheless conventional-cab locomotives. The Mikado wheel arrangement doubtless simplified the arrangement of crew around the big furnace. The fuel was two-thirds buckwheat coal and one-third bituminous.

Specifications by Steve Llanso of Sweat House Media
Locobase ID14,531
RailroadLehigh & Hudson River
Number in Class4
Road Numbers70-73
Number Built4
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)16.50 / 5.03
Engine Wheelbase (ft / m)35 / 10.67
Ratio of driving wheelbase to overall engine wheebase 0.47
Overall Wheelbase (engine & tender) (ft / m)68.21 / 20.79
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)216,000 / 97,976
Engine Weight (lbs / kg)290,000 / 131,542
Tender Loaded Weight (lbs / kg)168,000 / 76,204
Total Engine and Tender Weight (lbs / kg)458,000 / 207,746
Tender Water Capacity (gals / ML)9000 / 34.09
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)14 / 12.70
Minimum weight of rail (calculated) (lb/yd)90
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)57 / 1448
Boiler Pressure (psi / kPa)190 / 13.10
High Pressure Cylinders (dia x stroke) (in / mm)25" x 30" / 635x762
Tractive Effort (lbs / kg)53,125 / 24097.12
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.07
Heating Ability
Firebox Area (sq ft / m2)300 / 27.87
Grate Area (sq ft / m2)100 / 9.29
Evaporative Heating Surface (sq ft / m2)4155 / 386.01
Superheating Surface (sq ft / m2)964 / 89.56
Combined Heating Surface (sq ft / m2)5119 / 475.57
Evaporative Heating Surface/Cylinder Volume243.78
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation19,000
Same as above plus superheater percentage22,610
Same as above but substitute firebox area for grate area67,830
Power L115,177
Power MT619.62