Syracuse & Utica 4-2-0 "Jervis" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class unknown (Locobase 9682)

Data from John Weale, Benjamin Franklin Isherwood, Edward Dobson, Ensamples of Railway Making: Which, Although Not of English Practice, are Submitted, with Practical Illustrations, to the Civil Engineer, and the British and Irish Public (Architectural library, 1843), p. xx.

Boiler pressure is a Locobase estimate. The authors say this design was used in light traffic and reached 20-25 mph.

NB: Evaporative heating surface area estimate derived by adding reported direct heating surface to calculated tube heating surface.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID9682
RailroadSyracuse & Utica
Number in Class1
Road Numbers
Number Built1
BuilderRogers, Ketchum & Grosvenor
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)14,325 / 6498
Engine Weight (lbs / kg)22,215 / 10,077
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)24 / 12
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)54 / 1372
Boiler Pressure (psi / kPa)50 / 3.40
High Pressure Cylinders (dia x stroke) (in / mm)11" x 18" / 279x457
Tractive Effort (lbs / kg)1714 / 777.46
Factor of Adhesion (Weight on Drivers/Tractive Effort) 8.36
Heating Ability
Firebox Area (sq ft / m2)40 / 3.72
Grate Area (sq ft / m2) 7.84 / 0.73
Evaporative Heating Surface (sq ft / m2)476
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)476
Evaporative Heating Surface/Cylinder Volume240.42
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation392
Same as above plus superheater percentage392
Same as above but substitute firebox area for grate area2000
Power L11536
Power MT236.39

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Wes Barris