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; and "A Locomotive for Sharp Curves", Railroad and Engineering Journal, Volume LXI [61], No 3 (March 1887), pp. 143-144. (Thanks to Chris Hohl for his 28 February 2020 email correcting the wheelbases and adding fuel capacity and road number.

This was 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.

Chris Hohl's persistent research (and information from Ron Goldfeder) allowed him to send Locobase the following on the Annawomscutt's career: "Annawomscutt became Old Colony #224 in 1891, and the locomotive then appears to have been rebuilt into an 0-4-4T later that year. Apparently, the locomotive also had its driver diameter reduced from 63" to 60" at some point between when it was constructed to when it was rebuilt as an 0-4-4T. It then became New Haven #824 in 1893, and the locomotive was rebuilt, one more time, in 1897 into an X-4 class 0-4-0 sporting 57" drivers and trailing a new tender. It was renumbered once more to #2803 in 1904."

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID8428
RailroadProvidence, Warren & Bristol
Number in Class1
Road Numbers4
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 6.75 / 2.06
Engine Wheelbase (ft / m)31.17 / 9.50
Ratio of driving wheelbase to overall engine wheelbase 0.22
Overall Wheelbase (engine & tender) (ft / m)31.17 / 9.50
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 / Liters/MT)3 / 3
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
Tubes (number - dia) (in / mm)170 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.85 / 3.31
Firebox Area (sq ft / m2)96.25 / 8.94
Grate Area (sq ft / m2)14 / 1.30
Evaporative Heating Surface (sq ft / m2)1193 / 110.83
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1193 / 110.83
Evaporative Heating Surface/Cylinder Volume227.24
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 L15023
Power MT393.39

All material Copyright ©
Wes Barris