Otto Marmet Coal & Mining 0-4-4 "Forney" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Ella (Locobase 11811)

Data from Baldwin Logging Locomotives, p. 5 and DeGolyer, Volume 27, p. 66. Baldwin works numbers were 24479 in July 1904 and 32714 in May 1908.

Florence (Florenz when he stepped off the ship in 1849) and Otto Marmet founded the Marmet Coal Company in Cincinnati, Ohio, which was later named for Otto alone. The company's base of operations was a series of "Big Otto" mines near Raymond City, West Virginia.

OMC&M's first two locomotives were the wood-burners Ella and her sister Lena, which was delivered four years later. They were designed for tough service with springs to be

extra heavy and the tank beefed up. The tank's collar was to be doubly thick "as coal is thrown on in large lumps". The tank's false top was also twice as thick as normal to allow easy removal and replacement when worn.

Although specified to negotiate 22-degree curves, a note in Ella's spec says that the spring hangers on the "present engine come against wheels on curves and cut. This to be avoided on new engine."

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID11811
RailroadOtto Marmet Coal & Mining
Number in Class2
Road Numbers1-2
Number Built2
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 5.50 / 1.68
Engine Wheelbase (ft / m)18.50 / 5.64
Ratio of driving wheelbase to overall engine wheelbase 0.30
Overall Wheelbase (engine & tender) (ft / m)18.50 / 5.64
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)40,500 / 18,371
Engine Weight (lbs / kg)58,500 / 26,535
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)58,500
Tender Water Capacity (gals / ML)1000 / 3.79
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)34 / 17
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)40 / 1016
Boiler Pressure (psi / kPa)150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)13" x 18" / 330x457
Tractive Effort (lbs / kg)9696 / 4398.04
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.18
Heating Ability
Tubes (number - dia) (in / mm)81 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)9 / 2.74
Firebox Area (sq ft / m2)60.80 / 5.65
Grate Area (sq ft / m2) 8.98 / 0.83
Evaporative Heating Surface (sq ft / m2)439 / 40.78
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)439 / 40.78
Evaporative Heating Surface/Cylinder Volume158.48
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1347
Same as above plus superheater percentage1347
Same as above but substitute firebox area for grate area9120
Power L12682
Power MT291.99

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Wes Barris