These Ten-wheelers were built a year after the SAU & G began service. Their driver diameter increased by an inch to 58" in 1931. The 298 was scrapped at Palestine in December 1934.
This Ten-wheeler was built a year after the SAU & G began service. It was never superheated.
| Specifications | ||
|---|---|---|
| Class | TN-63 - 25.7 | TN-63 - 297 |
| Locobase ID | 7757 | 7755 |
| Railroad | San Antonio, Uvalde & Gulf (NOT & M/MP) | San Antonio, Uvalde & Gulf (NOT & M/MP) |
| Whyte | 4-6-0 | 4-6-0 |
| Road Numbers | 298-299 | 297 |
| Gauge | Std | Std |
| Builder | Alco | Alco |
| Year | 1913 | 1913 |
| Valve Gear | Walschaert | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 12' | 14' |
| Engine Wheelbase | 23.08' | 24.58' |
| Ratio of driving wheelbase to overall engine wheebase | 0.52 | 0.57 |
| Overall Wheelbase (engine & tender) | 56.08' | 54.45' |
| Axle Loading (Maximum Weight per Axle) | 42552 lbs | |
| Weight on Drivers | 113500 lbs | 116000 lbs |
| Engine Weight | 147500 lbs | 162000 lbs |
| Tender Light Weight | 123000 lbs | 109700 lbs |
| Total Engine and Tender Weight | 270500 lbs | 271700 lbs |
| Tender Water Capacity | 6000 gals | 6000 gals |
| Tender Fuel Capacity (oil/coal) | 2741 gals | 2721 gals |
| Minimum weight per yard of rail on which locomotive could run | 63 lb rail | 64 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 57" | 63" |
| Boiler Pressure | 180 psi | 200 psi |
| Cylinders (dia x stroke) | 20" x 24" | 19.5" x 26" |
| Tractive Effort | 25768 lbs | 26678 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.40 | 4.35 |
| Heating Ability | ||
| Firebox Area | 155 sq. ft | 160 sq. ft |
| Grate Area | 31 sq. ft | 29 sq. ft |
| Evaporative Heating Surface | 1560 | 2127 |
| Superheating Surface | 310 | |
| Combined Heating Surface | 1870 | 2127 |
| Evaporative Heating Surface/Cylinder Volume | 178.76 | 236.67 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 5580 | 5800 |
| Same as above plus superheater percentage | 6529 | 5800 |
| Same as above but substitute firebox area for grate area | 32643 | 32000 |
| Power L1 | 10043 | 6839 |
| Power MT | 585.22 | 389.93 |
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