Central Rufina 0-4-4 "Forney" Locomotives in 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.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID14,178
RailroadCentral Rufina
Number in Class2
Road Numbers1-2
Number Built2
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 4.50 / 1.37
Engine Wheelbase (ft / m)14.58 / 4.44
Ratio of driving wheelbase to overall engine wheebase 0.31
Overall Wheelbase (engine & tender) (ft / m)14.58 / 4.44
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)21,500 / 9752
Engine Weight (lbs / kg)35,000 / 15,876
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)35,000
Tender Water Capacity (gals / ML)600 / 2.27
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)18 / 9
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)33 / 838
Boiler Pressure (psi / kPa)150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)9" x 16" / 229x406
Tractive Effort (lbs / kg)5007 / 2271.14
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.29
Heating Ability
Firebox Area (sq ft / m2)26.20 / 2.43
Grate Area (sq ft / m2)5 / 0.46
Evaporative Heating Surface (sq ft / m2)226 / 21
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)226 / 21
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

All material Copyright © SteamLocomotive.com
Wes Barris