31 built for the Reading from 1917 to 1919. Firebox heating surface included 90 sq ft of arch tubes and syphons. Even with the enormous grate, these engines were still short of breath.
The class was broken up in the late 1920s when 11 engines were converted to K-1sa and K-1sc Santa Fe-type 2-10-2s. All of the remaining engines were rebuilt as simple-expansion articulateds with 4 cylinders of equal size; tractive effort became 111,400 lb. The first 4 engines to be rebuilt --1811, 1816, 1818, and 1821-- were converted by 1936 with the rest completed by 1945.
| Specifications | |
|---|---|
| Class | N1-sa |
| Locobase ID | 326 |
| Railroad | Reading |
| Whyte | 2-8-8-2 |
| Road Numbers | 1800-1830 |
| Gauge | Std |
| Builder | Baldwin |
| Year | 1917 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 15' |
| Engine Wheelbase | 55.83' |
| Ratio of driving wheelbase to overall engine wheebase | 0.27 |
| Overall Wheelbase (engine & tender) | 82.98' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 435200 lbs |
| Engine Weight | 478500 lbs |
| Tender Light Weight | 170000 lbs |
| Total Engine and Tender Weight | 648500 lbs |
| Tender Water Capacity | 8500 gals |
| Tender Fuel Capacity (oil/coal) | 15.5 tons |
| Minimum weight per yard of rail on which locomotive could run | 90.67 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 55.50" |
| Boiler Pressure | 210 psi |
| Cylinders (dia x stroke) | 26" x 32" |
| Low Pressure Cylinders (dia x stroke) | 40" x 32" |
| Tractive Effort | 97818 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.45 |
| Heating Ability | |
| Firebox Area | 385 sq. ft |
| Grate Area | 108 sq. ft |
| Evaporative Heating Surface | 5747 |
| Superheating Surface | 1436 |
| Combined Heating Surface | 7183 |
| Evaporative Heating Surface/Cylinder Volume | 292.26 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 22680 |
| Same as above plus superheater percentage | 27214.11 |
| Same as above but substitute firebox area for grate area | 97013.25 |
| Power L1 | 8596.03 |
| Power MT | 348.36 |
| This page last modified: . | [Contact] | All material © 1999-2008 SteamLocomotive.com |