Fitchburg 4-4-0 "American" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class Union (Locobase 13548)

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.

The organizers of the 1851 trials expressed regret that some of the contestants supplied incomplete data for the table. The Union's entry reflects this lack. Enough was offered to show that this was an average-sized freight Eight-wheeler for the time.

The boiler pressure is the "effective pressure" as measured during the trials.

Specifications by Steve Llanso of Sweat House Media
ClassUnion
Locobase ID13,548
RailroadFitchburg
CountryUSA
Whyte4-4-0
Number in Class1
Road Numbers
GaugeStd
Number Built1
BuilderBoston Locomotive Works
Year1851
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)46,980 / 21,310
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)66 / 1676
Boiler Pressure (psi / kPa)97 / 5.20
High Pressure Cylinders (dia x stroke) (in / mm)16" x 20" / 406x508
Tractive Effort (lbs / kg)6396 / 2901.18
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Firebox Area (sq ft / m2)
Grate Area (sq ft / m2) 9.50 / 0.88
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 Computation922
Same as above plus superheater percentage922
Same as above but substitute firebox area for grate area
Power L1
Power MT