Central Rufina 0-4-4 "Forney" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 14178)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 31, p. 13 and Vol 49, p. 71. Works numbers were 31705 in September 1907 and 33594 in July 1909.

The specifications called for this little tanks to squirm around curves as tight as 47 degrees (126 feet/38.4 metre radii). Both engines were ordered by Ernst Wiener Company on behalf of the Trujillo & Mercado.

Specifications by Steve Llanso of Sweat House Media
Locobase ID14178
RailroadCentral Rufina
Number in Class2
Road Numbers1-2
Number Built2
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase 4.50'
Engine Wheelbase14.58'
Ratio of driving wheelbase to overall engine wheebase 0.31
Overall Wheelbase (engine & tender)14.58'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers21500 lbs
Engine Weight35000 lbs
Tender Light Weight
Total Engine and Tender Weight35000 lbs
Tender Water Capacity600 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)18 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter33"
Boiler Pressure150 psi
Cylinders (dia x stroke)9" x 16"
Tractive Effort5007 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.29
Heating Ability
Firebox Area26.20 sq. ft
Grate Area5 sq. ft
Evaporative Heating Surface226 sq. ft
Superheating Surface
Combined Heating Surface226 sq. ft
Evaporative Heating Surface/Cylinder Volume191.83
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation750
Same as above plus superheater percentage750
Same as above but substitute firebox area for grate area3930
Power L12500
Power MT512.70

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