Providence, Warren & Bristol 4-4-6 Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Annawomscutt (Locobase 8428)

Data from 1891 edition of Matthais Forney's Catechism of the Locomotive, pp. 140-141.

Locobase estimates the boiler pressure, but knows nothing more about this design. It is an unusual arrangement from a small builder. It is also unlikely to have been repeated because of the low percentage of the total weight that rested on the drivers.

Berliner's categorization of wheel arrangments -- [], accessed 21 May 2007 -- shows the building date. And John H White, Early American Locomotives (New York: Dover, 1972), pl.100, says that the Annawomscutt was rebuilt as a "4-wheel engine" in 1891. It's not clear what arrangement that phrase might signify.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID8428
RailroadProvidence, Warren & Bristol
Number in Class1
Road Numbers
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 6.67 / 2.03
Engine Wheelbase (ft / m)34.42 / 10.49
Ratio of driving wheelbase to overall engine wheebase 0.19
Overall Wheelbase (engine & tender) (ft / m)34.42 / 10.49
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)56,300 / 25,537
Engine Weight (lbs / kg)118,700 / 53,841
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)118,700
Tender Water Capacity (gals / ML)2200 / 8.33
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)47 / 23.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)63 / 1600
Boiler Pressure (psi / kPa)150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)17" x 20" / 432x508
Tractive Effort (lbs / kg)11,698 / 5306.13
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.81
Heating Ability
Firebox Area (sq ft / m2)96.25 / 8.95
Grate Area (sq ft / m2)14 / 1.30
Evaporative Heating Surface (sq ft / m2)1193 / 110.87
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1193 / 110.87
Evaporative Heating Surface/Cylinder Volume227.06
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2100
Same as above plus superheater percentage2100
Same as above but substitute firebox area for grate area14,438
Power L15019
Power MT393.07

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Wes Barris