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 ID11,497
RailroadUS Government (Sandy Hook)
Number in Class1
Road Numbers4
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)7
Engine Wheelbase (ft)28.50
Ratio of driving wheelbase to overall engine wheebase 0.25
Overall Wheelbase (engine & tender) (ft)28.50
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)55,000
Engine Weight (lbs)100,000
Tender Loaded Weight (lbs)
Total Engine and Tender Weight (lbs)100,000
Tender Water Capacity (gals)1500
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)46
Geometry Relating to Tractive Effort
Driver Diameter (in)54
Boiler Pressure (psi)160
High Pressure Cylinders (dia x stroke) (in)15" x 22"
Tractive Effort (lbs)12,467
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.41
Heating Ability
Firebox Area (sq ft)108
Grate Area (sq ft)19.50
Evaporative Heating Surface (sq ft)896
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)896
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 area17,280
Power L14596
Power MT368.45

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