Union Terminal 2-4-4 Locomotives in 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 Rail Data Exchange. See also DeGolyer, Volume 18, p. 199. (Thanks to Chris Hohl for his 5 July 2019 email noting the original specs as described below.) 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 (254 mm and 432 mm) cylinders and piston valves of 8" (203 mm) diameter. (The latter were probably the smallest diameter used for a Vauclain compound to serve both the HP and LP cylinder in each group.) Chris Hohl noted that the original boiler pressure was set to 180 psi (12.4 bar) and the 56 rolled on 56" (1,422 mm) drivers. Baldwin's spec anticipated a coal capacity of "at least 2 tons.", according to Hohl.

The data refer to a later rebuilding with simple-expansion cylinders, slide valves, thicker tires that added an inch to the driver diameter, and lower pressure.

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

Principal Dimensions 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 (ft / m) 7.50 / 2.29
Engine Wheelbase (ft / m)29.79 / 9.08
Ratio of driving wheelbase to overall engine wheelbase 0.25
Overall Wheelbase (engine & tender) (ft / m)29.79 / 9.08
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)58,000 / 26,308
Engine Weight (lbs / kg)118,000 / 53,524
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)118,000
Tender Water Capacity (gals / ML)2000 / 7.58
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)3 / 3
Minimum weight of rail (calculated) (lb/yd / kg/m)48 / 24
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)57 / 1448
Boiler Pressure (psi / kPa)155 / 10.70
High Pressure Cylinders (dia x stroke) (in / mm)16" x 24" / 406x610
Tractive Effort (lbs / kg)14,201 / 6441.47
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.08
Heating Ability
Tubes (number - dia) (in / mm)159 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)11.79 / 3.59
Firebox Area (sq ft / m2)100 / 9.29
Grate Area (sq ft / m2)16.30 / 1.51
Evaporative Heating Surface (sq ft / m2)1029 / 95.60
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1029 / 95.60
Evaporative Heating Surface/Cylinder Volume184.08
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 area15,500
Power L14028
Power MT306.21

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