The M & NA was built in the early 1900s. Its 400-mile main line ran in a NW-SE direction across the top of Arkansas.
This diagram book must be from its early days, given the number of the locomotive. Dickson's works # was 1145.
A year after the 3 was built, the M & NA went for a duo of somewhat larger Ten-wheelers. Cooke's works # 2674 & 2675. The Baldwin Moguls (Locobase 6640) that followed a year later had very similar boiler, grate, and power dimensions.
| Specifications | ||
|---|---|---|
| Class | T-20 | T-25 |
| Locobase ID | 6638 | 6639 |
| Railroad | Missouri & Northern Arkansas | Missouri & Northern Arkansas |
| Whyte | 4-6-0 | 4-6-0 |
| Road Numbers | 3 | 4-5 |
| Gauge | Std | Std |
| Builder | Dickson | Cooke |
| Year | 1900 | 1901 |
| Valve Gear | Stephenson | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 11.50' | 11.50' |
| Engine Wheelbase | 21.33' | 21.92' |
| Ratio of driving wheelbase to overall engine wheebase | 0.54 | 0.52 |
| Overall Wheelbase (engine & tender) | 57.21' | 51' |
| Axle Loading (Maximum Weight per Axle) | ||
| Weight on Drivers | 91500 lbs | 107000 lbs |
| Engine Weight | 116000 lbs | 130000 lbs |
| Tender Light Weight | 80000 lbs | 120000 lbs |
| Total Engine and Tender Weight | 196000 lbs | 250000 lbs |
| Tender Water Capacity | 4000 gals | 6000 gals |
| Tender Fuel Capacity (oil/coal) | 10 tons | 12 tons |
| Minimum weight per yard of rail on which locomotive could run | 50.83 lb rail | 59.44 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) | 4.38 | 4.17 |
| Heating Ability | ||
| Firebox Area | 124 sq. ft | 145.50 sq. ft |
| Grate Area | 28 sq. ft | 30.28 sq. ft |
| Evaporative Heating Surface | 1653 | 1957 |
| Superheating Surface | ||
| Combined Heating Surface | 1653 | 1957 |
| Evaporative Heating Surface/Cylinder Volume | 233.85 | 229.37 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 5040 | 5450.40 |
| Same as above plus superheater percentage | 5040 | 5450.40 |
| Same as above but substitute firebox area for grate area | 22320 | 26190 |
| Power L1 | 5498.74 | 5285.86 |
| Power MT | 397.46 | 326.73 |
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