Tonopah 2-6-0 "Mogul" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 12508)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 27, p. 114. Works number was 24689 in September 1904.

Bought just before the Tonopah converted to standard gauge, this Mogul spent most of its working life on the Sumpter Valley Railroad in Oregon.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID12,508
Number in Class1
Road Numbers4
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.67 / 2.95
Engine Wheelbase (ft / m)16.67 / 5.08
Ratio of driving wheelbase to overall engine wheebase 0.58
Overall Wheelbase (engine & tender) (ft / m)42.54 / 12.97
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)72,000 / 32,659
Engine Weight (lbs / kg)82,000 / 37,195
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)3500 / 13.26
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)40 / 20
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)45 / 1143
Boiler Pressure (psi / kPa)150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)16" x 22" / 406x559
Tractive Effort (lbs / kg)15,957 / 7237.98
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.51
Heating Ability
Firebox Area (sq ft / m2)57.70 / 5.36
Grate Area (sq ft / m2)13.60 / 1.26
Evaporative Heating Surface (sq ft / m2)832 / 77.32
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)832 / 77.32
Evaporative Heating Surface/Cylinder Volume162.51
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2040
Same as above plus superheater percentage2040
Same as above but substitute firebox area for grate area8655
Power L12462
Power MT226.16