Among the early M & NA locomotives, this Mogul (works 23354) was the smallest, but had the longest wheelbase.
The M & NA went to Baldwin to build two more locomotives of the same power and size as the Ten-wheelers they'd received from Cooke. But, for some reason, these were Moguls (works 21456 & 21462).
| Specifications | ||
|---|---|---|
| Class | M-20 | M-26 |
| Locobase ID | 6641 | 6640 |
| Railroad | Missouri & Northern Arkansas | Missouri & Northern Arkansas |
| Whyte | 2-6-0 | 2-6-0 |
| Road Numbers | 9 | 6-7 |
| Gauge | Std | Std |
| Builder | Burnham, Williams & Co | Burnham, Williams & Co |
| Year | 1903 | 1901 |
| Valve Gear | Stephenson | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 15.42' | 12' |
| Engine Wheelbase | 23.50' | 21' |
| Ratio of driving wheelbase to overall engine wheebase | 0.66 | 0.57 |
| Overall Wheelbase (engine & tender) | 47.67' | 49.83' |
| Axle Loading (Maximum Weight per Axle) | ||
| Weight on Drivers | 102000 lbs | 115000 lbs |
| Engine Weight | 120000 lbs | 135000 lbs |
| Tender Light Weight | 80000 lbs | 120000 lbs |
| Total Engine and Tender Weight | 200000 lbs | 255000 lbs |
| Tender Water Capacity | 4500 gals | 6000 gals |
| Tender Fuel Capacity (oil/coal) | 12 tons | 12 tons |
| Minimum weight per yard of rail on which locomotive could run | 56.67 lb rail | 63.89 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 57" | 56" |
| Boiler Pressure | 180 psi | 180 psi |
| Cylinders (dia x stroke) | 18" x 24" | 19" x 26" |
| Tractive Effort | 20872 lbs | 25644 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.89 | 4.48 |
| Heating Ability | ||
| Firebox Area | 84.50 sq. ft | 145 sq. ft |
| Grate Area | 17.66 sq. ft | 30.60 sq. ft |
| Evaporative Heating Surface | 1555 | 1945 |
| Superheating Surface | ||
| Combined Heating Surface | 1555 | 1945 |
| Evaporative Heating Surface/Cylinder Volume | 219.99 | 227.96 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 3178.80 | 5508 |
| Same as above plus superheater percentage | 3178.80 | 5508 |
| Same as above but substitute firebox area for grate area | 15210 | 26100 |
| Power L1 | 4783.88 | 5257.31 |
| Power MT | 310.20 | 302.36 |
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