Brooks delivered these Atlantics from 2 orders in three batches - 10 in June and December 1902, the last 5 in May 1905. Like most Atlantics, these engines no longer had a role to play once passenger trains had grown too heavy. They were never superheated and all were out of service by 1940.
| Specifications | |
|---|---|
| Class | K-20 |
| Locobase ID | 8742 |
| Railroad | Wisconsin Central (Soo) |
| Whyte | 4-4-2 |
| Road Numbers | 257-271 / 2900-2914 |
| Gauge | Std |
| Builder | Alco-Brooks |
| Year | 1902 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase | 7.25' |
| Engine Wheelbase | 28' |
| Ratio of driving wheelbase to overall engine wheebase | 0.26 |
| Overall Wheelbase (engine & tender) | 55.65' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 88100 lbs |
| Engine Weight | 160400 lbs |
| Tender Light Weight | 113400 lbs |
| Total Engine and Tender Weight | 273800 lbs |
| Tender Water Capacity | 5000 gals |
| Tender Fuel Capacity (oil/coal) | 12 tons |
| Minimum weight per yard of rail on which locomotive could run | 73 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 79" |
| Boiler Pressure | 200 psi |
| Cylinders (dia x stroke) | 20" x 26" |
| Tractive Effort | 22380 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.94 |
| Heating Ability | |
| Firebox Area | 180 sq. ft |
| Grate Area | 48.32 sq. ft |
| Evaporative Heating Surface | 2634 |
| Superheating Surface | |
| Combined Heating Surface | 2634 |
| Evaporative Heating Surface/Cylinder Volume | 278.62 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 9664 |
| Same as above plus superheater percentage | 9664 |
| Same as above but substitute firebox area for grate area | 36000 |
| Power L1 | 9844 |
| Power MT | 492.67 |
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