Schenectady 4-4-0 "American" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 2 (Locobase 8402)

Data from William FM Goss, High Steam-Pressures in Locomotive Service, (Washington, DC: Carnegie Institution of Washington, 1907).

Although Schenectady originally delivered this engine in 1897, snags and delays prevented actual testing of the effect of higher pressures on economy and performance until a grant was awarded in 1904 by the Carnegie Institute. This locomotive then was thoroughly tested.

Results indicated that as a saturated-steam locomotive boiler was pressed beyond 200 pounds, the percentage decrease in consumption as pressure increased was less than a commensurate increase at lower pressures. In other words, boiler pressure represented the same kind of barrier to increased economy in locomotive boilers as did the speed of sound to aircraft in a later decade. The solution for locomotives would lie in superheating the steam, which was just then taking hold in several countries around the world.

Specifications by Steve Llanso of Sweat House Media
Locobase ID8402
Number in Class1
Road Numbers2
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase 8.50'
Engine Wheelbase23'
Ratio of driving wheelbase to overall engine wheebase 0.37
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers61000 lbs
Engine Weight109000 lbs
Tender Light Weight
Total Engine and Tender Weight
Tender Water Capacity
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)51 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter69.50"
Boiler Pressure240 psi
Cylinders (dia x stroke)16" x 24"
Tractive Effort18034 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.38
Heating Ability
Firebox Area126 sq. ft
Grate Area17 sq. ft
Evaporative Heating Surface1322 sq. ft
Superheating Surface
Combined Heating Surface1322 sq. ft
Evaporative Heating Surface/Cylinder Volume236.70
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4080
Same as above plus superheater percentage4080
Same as above but substitute firebox area for grate area30240
Power L19716
Power MT702.30

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