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 would the speed of sound to aircraft in a later decade. The solution for locomotives lay in superheating the steam, which was just then taking hold in several countries around the world.
Principal Dimensions by Steve Llanso of Middle Run Media | |
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Class | 2 |
Locobase ID | 8402 |
Railroad | Schenectady |
Country | USA |
Whyte | 4-4-0 |
Number in Class | 1 |
Road Numbers | 2 |
Gauge | Std |
Number Built | 1 |
Builder | Schenectady |
Year | 1897 |
Valve Gear | Stephenson |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 8.50 / 2.59 |
Engine Wheelbase (ft / m) | 23 / 7.01 |
Ratio of driving wheelbase to overall engine wheelbase | 0.37 |
Overall Wheelbase (engine & tender) (ft / m) | |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | 61,000 / 27,669 |
Engine Weight (lbs / kg) | 109,000 / 49,442 |
Tender Loaded Weight (lbs / kg) | |
Total Engine and Tender Weight (lbs / kg) | |
Tender Water Capacity (gals / ML) | |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 51 / 25.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 69.50 / 1765 |
Boiler Pressure (psi / kPa) | 240 / 1650 |
High Pressure Cylinders (dia x stroke) (in / mm) | 16" x 24" / 406x610 |
Tractive Effort (lbs / kg) | 18,034 / 8180.09 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.38 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 200 - 2" / 51 |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | 11.50 / 3.51 |
Firebox Area (sq ft / m2) | 126 / 11.71 |
Grate Area (sq ft / m2) | 17 / 1.58 |
Evaporative Heating Surface (sq ft / m2) | 1322 / 122.86 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 1322 / 122.86 |
Evaporative Heating Surface/Cylinder Volume | 236.49 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 4080 |
Same as above plus superheater percentage | 4080 |
Same as above but substitute firebox area for grate area | 30,240 |
Power L1 | 9708 |
Power MT | 701.72 |