Unspecified 4-2-0 "Jervis" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class unknown (Locobase 1027)

Based on a description published by Paul R Hodge (who may have designed it) in 1840. He claimed that the engine had pulled a 220-ton load at 14 miles up a slope. See White (1968), 280-286.

Specifications by Steve Llanso of Sweat House Media
Locobase ID1027
Number in Class
Road Numbers
Number Built
BuilderHR Dunham & Co.
Valve Gear
Locomotive Length and Weight
Driver Wheelbase
Engine Wheelbase
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers
Engine Weight
Tender Light Weight
Total Engine and Tender Weight
Tender Water Capacity
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)0
Geometry Relating to Tractive Effort
Driver Diameter54"
Boiler Pressure50 psi
Cylinders (dia x stroke)10.5" x 16"
Tractive Effort1388 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Firebox Area
Grate Area9 sq. ft
Evaporative Heating Surface
Superheating Surface
Combined Heating Surface0
Evaporative Heating Surface/Cylinder Volume
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation450
Same as above plus superheater percentage450
Same as above but substitute firebox area for grate area0
Power L10
Power MT

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