These Heavy Mikados were supplied "off the shelf" by the United States Railroad Administration during the 2-year period of nationalization that began in December 1917. They came in two batches: works numbers 59720-59729 and 60375-60384. The two sets differed only in the type of rear engine frame. 6001-6010 had a slab type, 6011-6020 the more considerate sounding "Commonwealth cradle".
At first the M-1s had the standard USRA firebox, but over time the railroad modified it along lines adopted by many others. Most important was the deletion of a few square feet of arch tubes in favor of much more heating surface (77 sq ft) in the form of thermic syphons.
Otherwise, a very sound design saw no other significant changes during a career that ended with the last steam runs on the W & LE in 1958.
| Specifications | |
|---|---|
| Class | M-1 |
| Locobase ID | 7897 |
| Railroad | Wheeling & Lake Erie |
| Whyte | 2-8-2 |
| Road Numbers | 6001-6020 |
| Gauge | Std |
| Builder | Alco-Brooks |
| Year | 1918 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 16.75' |
| Engine Wheelbase | 36.08' |
| Ratio of driving wheelbase to overall engine wheebase | 0.46 |
| Overall Wheelbase (engine & tender) | 79.21' |
| Axle Loading (Maximum Weight per Axle) | 61399 lbs |
| Weight on Drivers | 239839 lbs |
| Engine Weight | 321678 lbs |
| Tender Light Weight | 250800 lbs |
| Total Engine and Tender Weight | 572478 lbs |
| Tender Water Capacity | 16000 gals |
| Tender Fuel Capacity (oil/coal) | 17.7 tons |
| Minimum weight per yard of rail on which locomotive could run | 99.93 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 63" |
| Boiler Pressure | 200 psi |
| Cylinders (dia x stroke) | 27" x 32" |
| Tractive Effort | 62949 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.81 |
| Heating Ability | |
| Firebox Area | 375 sq. ft |
| Grate Area | 70.80 sq. ft |
| Evaporative Heating Surface | 4353 sq. ft |
| Superheating Surface | 993 sq. ft |
| Combined Heating Surface | 5346 sq. ft |
| Evaporative Heating Surface/Cylinder Volume | 205.27 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 14160 |
| Same as above plus superheater percentage | 16790.17 |
| Same as above but substitute firebox area for grate area | 88930.98 |
| Power L1 | 15017.86 |
| Power MT | 552.18 |
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