US Government 2-4-4 Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class General Rodman (Locobase 11497)

Data from Baldwin Locomotive Works Specification for Engines, 1903, as digitized by the DeGolyer Library of Southern Methodist University Vol 26, p. 266. Works numbers were 23969 in March 1904.

After working at the Sandy Hook Arsenal, the 4 was transferred to the Aberdeen Proving Grounds as their #11.

Specifications by Steve Llanso of Sweat House Media
ClassGeneral Rodman
Locobase ID11497
RailroadUS Government (Sandy Hook)
Number in Class1
Road Numbers4
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase7'
Engine Wheelbase28.50'
Ratio of driving wheelbase to overall engine wheebase 0.25
Overall Wheelbase (engine & tender)28.50'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers55000 lbs
Engine Weight100000 lbs
Tender Light Weight
Total Engine and Tender Weight100000 lbs
Tender Water Capacity1500 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)46 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter54"
Boiler Pressure160 psi
Cylinders (dia x stroke)15" x 22"
Tractive Effort12467 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.41
Heating Ability
Firebox Area108 sq. ft
Grate Area19.50 sq. ft
Evaporative Heating Surface896 sq. ft
Superheating Surface
Combined Heating Surface896 sq. ft
Evaporative Heating Surface/Cylinder Volume199.13
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3120
Same as above plus superheater percentage3120
Same as above but substitute firebox area for grate area17280
Power L14596
Power MT368.45

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