New Castle & Frenchtown 4-2-0 "Jervis" Locomotives in 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)...."

Principal Dimensions 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 (ft / m)
Engine Wheelbase (ft / m)
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)10,000 / 4536
Engine Weight (lbs / kg)15,000 / 6804
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)17 / 8.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)60 / 1524
Boiler Pressure (psi / kPa)75 / 5.20
High Pressure Cylinders (dia x stroke) (in / mm)11" x 16" / 279x406
Tractive Effort (lbs / kg)2057 / 933.04
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.86
Heating Ability
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2)
Evaporative Heating Surface (sq ft / m2)
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)
Evaporative Heating Surface/Cylinder Volume
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation
Same as above plus superheater percentage
Same as above but substitute firebox area for grate area
Power L1
Power MT

All material Copyright ©
Wes Barris