Locobase hasn't been able to establish the original owner of this Eight-wheeler. The MoPac roster published on http://www.trainweb.org/screamingeagle/roster_ab&so.html, last accessed on 24 July 2006, shows that this locomotive was retired in 1919. But a Texas & Pacific diagram book shows instead that this locomotive was converted to a 2-6-0 by Baldwin in 1926; see 8500.
The A & S Eight-wheeler was "used", but its provenance is unknown to Locobase. A comparison with a very similar engine from another builder in the same year -- the Union Pacific's 780 class of 10 locomotives delivered by Brooks -- shows an identically sized boiler and the same cylinder volume, but the Brooks engine had slightly larger grate, 1" taller drivers, and a pressure set at 150 psi. The A & S engine put 5 1/2 more tons on the drivers.
| Specifications | ||
|---|---|---|
| Class | C | C |
| Locobase ID | 7359 | 7360 |
| Railroad | Abilene & Southern | Abilene & Southern |
| Whyte | 4-4-0 | 4-4-0 |
| Road Numbers | 12 | 13 |
| Gauge | Std | Std |
| Builder | Pittsburgh | Burnham, Parry, Williams & Co |
| Year | 1884 | 1888 |
| Valve Gear | Stephenson | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 9.25' | 8.85' |
| Engine Wheelbase | 23.50' | 24.75' |
| Ratio of driving wheelbase to overall engine wheebase | 0.39 | 0.36 |
| Overall Wheelbase (engine & tender) | 47.71' | 48.79' |
| Axle Loading (Maximum Weight per Axle) | ||
| Weight on Drivers | 72000 lbs | 74000 lbs |
| Engine Weight | 107630 lbs | 107540 lbs |
| Tender Light Weight | 70870 lbs | 82460 lbs |
| Total Engine and Tender Weight | 178500 lbs | 190000 lbs |
| Tender Water Capacity | 3500 gals | 4000 gals |
| Tender Fuel Capacity (oil/coal) | 12 tons | 12 tons |
| Minimum weight per yard of rail on which locomotive could run | 60 lb rail | 62 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 63" | 62" |
| Boiler Pressure | 140 psi | 140 psi |
| Cylinders (dia x stroke) | 18" x 24" | 18" x 26" |
| Tractive Effort | 14688 lbs | 16169 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.90 | 4.58 |
| Heating Ability | ||
| Firebox Area | 130 sq. ft | 110.60 sq. ft |
| Grate Area | 19 sq. ft | 17 sq. ft |
| Evaporative Heating Surface | 1267 | 1426 |
| Superheating Surface | ||
| Combined Heating Surface | 1267 | 1426 |
| Evaporative Heating Surface/Cylinder Volume | 179.24 | 186.22 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 2660 | 2380 |
| Same as above plus superheater percentage | 2660 | 2380 |
| Same as above but substitute firebox area for grate area | 18200 | 15484 |
| Power L1 | 3987 | 3739 |
| Power MT | 244.16 | 222.79 |
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