New Castle & Frenchtown 4-2-0 "Jervis" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class Comet (Locobase 851)

Railway & Locomotive Historical Society Bulletin #13 (1927) has report by the Delaware railroad of this engine's performance.

Superintendent of Repair Dobbs told Chief Engineer J. Knight and Engineer of Location and Construction Benjamin H. Latrobe that all future engines should be of the 4-2-0 type "in order to insure a greater degree of steadiness in the motion upon the track." Dobbs also expressed "a decided preference to the English form of locomotives as exhibited in the engines of Stevenson's (sic)...."

Specifications by Steve Llanso of Sweat House Media
Locobase ID851
RailroadNew Castle & Frenchtown
Number in Class3
Road Numbers6
Number Built3
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 Drivers10000 lbs
Engine Weight15000 lbs
Tender Light Weight
Total Engine and Tender Weight
Tender Water Capacity
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)17 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter60"
Boiler Pressure75 psi
Cylinders (dia x stroke)11" x 16"
Tractive Effort2057 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.86
Heating Ability
Firebox Area
Grate Area
Evaporative Heating Surface
Superheating Surface
Combined Heating Surface0
Evaporative Heating Surface/Cylinder Volume
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation0
Same as above plus superheater percentage0
Same as above but substitute firebox area for grate area0
Power L10
Power MT0

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