Connecticut & Passumpsic 4-4-0 "American" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class Addison Gilmore (Locobase 13551)

Data from table entitled "Table of Dimensions of the Locomotives" in New England Association of Railway Superintendents, Report of the Trials of Locomotive Engines Made Upon 1st and 2nd October, 1851 (Boston: B J Yerrinton, Printers, 1852), p. 16.

This locomotive had its boiler pressure measured at 144 psi by the committee overseeing the October 1851 trials. Despite the juiced-up power, this high-drivered engine took almost 2 minutes more to finish the 9-mile course than did its identically named rival (Locobase 13519).

Although the specs didn't include areas, a calculation of tube area shows that this was one of the largest locomotives in the competition. Given that the contestants represented New England railroad practice, Locobase supposes this

Principal Dimensions by Steve Llanso of Sweat House Media
ClassAddison Gilmore
Locobase ID13,551
RailroadConnecticut & Passumpsic
Number in Class1
Road Numbers
Number Built1
Valve GearV-hook
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)
Engine Weight (lbs / kg)46,320 / 22,108
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)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)78 / 1829
Boiler Pressure (psi / kPa)124 / 6.90
High Pressure Cylinders (dia x stroke) (in / mm)16" x 20" / 381x508
Tractive Effort (lbs / kg)6919 / 3138.41
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Firebox Area (sq ft / m2) / 5.70
Grate Area (sq ft / m2) / 1
Evaporative Heating Surface (sq ft / m2) / 64.29
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2) / 64.29
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

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Wes Barris