Union Terminal 2-4-4 Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 56 / A (Locobase 6827)

Data from KCS 12 - 1908 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Raildata collection. See also DeGolyer, Volume 18, p. 199. Works number was 13430 in May 1893.

Bought for the Union Terminal in Kansas City, this little Forney entered service as a Vauclain compound with 10" HP and 17" LP cylinders and piston valves of 8" (203 mm) diameter. The data refer to a later rebuilding with simple-expansion cylinders and slide valves.

It later passed to the Kansas City Southern with the same number and finally was sold to Security Iron Company in March 1918.

Specifications by Steve Llanso of Sweat House Media
Class56 / A
Locobase ID6827
RailroadUnion Terminal (KCS)
Number in Class1
Road Numbers56
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase 7.50'
Engine Wheelbase29.79'
Ratio of driving wheelbase to overall engine wheebase 0.25
Overall Wheelbase (engine & tender)29.79'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers58000 lbs
Engine Weight118000 lbs
Tender Light Weight
Total Engine and Tender Weight118000 lbs
Tender Water Capacity2000 gals
Tender Fuel Capacity (oil/coal)3 tons
Minimum weight of rail (calculated)48 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter57"
Boiler Pressure155 psi
Cylinders (dia x stroke)16" x 24"
Tractive Effort14201 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.08
Heating Ability
Firebox Area100 sq. ft
Grate Area16.30 sq. ft
Evaporative Heating Surface1029 sq. ft
Superheating Surface
Combined Heating Surface1029 sq. ft
Evaporative Heating Surface/Cylinder Volume184.24
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2527
Same as above plus superheater percentage2527
Same as above but substitute firebox area for grate area15500
Power L14031
Power MT306.44


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