Comparisons with other 2-6-6-2s reveals that this design was virtually identical to that of the Great Northern's second batch of L-1s (Locobase 819), but with larger HP cylinders.
Like the later Ls, these articulateds were dedicated to pusher service, which explains the lack of a superheater upgrade and the retention of slide valves. According to Drury (1993), the class was converted to super-switchers (0-6-6-0s) in 1927-1931.
| Specifications | |
|---|---|
| Class | M-1 |
| Locobase ID | 8321 |
| Railroad | Western Maryland (WM) |
| Whyte | 2-6-6-2 |
| Road Numbers | 951-959 |
| Gauge | Std |
| Builder | Baldwin |
| Year | 1910 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 10' |
| Engine Wheelbase | 44.83' |
| Ratio of driving wheelbase to overall engine wheebase | 0.22 |
| Overall Wheelbase (engine & tender) | 78.44' |
| Axle Loading (Maximum Weight per Axle) | 56800 lbs |
| Weight on Drivers | 298100 lbs |
| Engine Weight | 342000 lbs |
| Tender Light Weight | 166200 lbs |
| Total Engine and Tender Weight | 508200 lbs |
| Tender Water Capacity | 9500 gals |
| Tender Fuel Capacity (oil/coal) | 14 tons |
| Minimum weight per yard of rail on which locomotive could run | 82.81 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 55" |
| Boiler Pressure | 200 psi |
| Cylinders (dia x stroke) | 23" x 32" |
| Low Pressure Cylinders (dia x stroke) | 35" x 32" |
| Tractive Effort | 73085 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.08 |
| Heating Ability | |
| Firebox Area | 225 sq. ft |
| Grate Area | 78 sq. ft |
| Evaporative Heating Surface | 5609 |
| Superheating Surface | |
| Combined Heating Surface | 5609 |
| Evaporative Heating Surface/Cylinder Volume | 364.51 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 15600 |
| Same as above plus superheater percentage | 15600 |
| Same as above but substitute firebox area for grate area | 45000 |
| Power L1 | 3464.59 |
| Power MT | 153.74 |
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