In the same year that Brooks delivered the first of its L1 Mikados to the Alton (Locobase 9100), it supplied this trio of light Mallets. They apparently borrowed the same boiler design, but lengthened the tubes by a foot and included more flues. Like the Mikes, the HP cylinders had 14" piston valves.
One was sold almost immediately to the Chesapeake & Ohio and classed as an H-3, although it was quite different from the Chessie's other H-3s. It served the C & O until the late 1920s.
The other two persisted in pusher service until the Alton was taken over by the Baltimore & Ohio. The pair then traveled east, but into storage rather than into service and, without any further service, they were scrapped in 1938.
| Specifications | |
|---|---|
| Class | K1 |
| Locobase ID | 9102 |
| Railroad | Chicago & Alton |
| Whyte | 2-6-6-2 |
| Road Numbers | 700-702 |
| Gauge | Std |
| Builder | Alco-Brooks |
| Year | 1910 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 11' |
| Engine Wheelbase | 48.08' |
| Ratio of driving wheelbase to overall engine wheebase | 0.23 |
| Overall Wheelbase (engine & tender) | 74.62' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 318004 lbs |
| Engine Weight | 365004 lbs |
| Tender Light Weight | 205600 lbs |
| Total Engine and Tender Weight | 570604 lbs |
| Tender Water Capacity | 11000 gals |
| Tender Fuel Capacity (oil/coal) | 18 tons |
| Minimum weight per yard of rail on which locomotive could run | 88.33 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 62" |
| Boiler Pressure | 200 psi |
| Cylinders (dia x stroke) | 22" x 30" |
| Low Pressure Cylinders (dia x stroke) | 35" x 30" |
| Tractive Effort | 57075 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.57 |
| Heating Ability | |
| Firebox Area | 227 sq. ft |
| Grate Area | 63.30 sq. ft |
| Evaporative Heating Surface | 4205 |
| Superheating Surface | 1117 |
| Combined Heating Surface | 5322 |
| Evaporative Heating Surface/Cylinder Volume | 318.58 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 12660 |
| Same as above plus superheater percentage | 15317.13 |
| Same as above but substitute firebox area for grate area | 54928.71 |
| Power L1 | 9522.70 |
| Power MT | 396.11 |
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