Probably among the last engines produced by this minor component of the Alco consortium, the sextet of Ten-wheelers obviously were superheated later than 1903. In 1931, driver diameter grew from 63" to 64".
This Baldwin passenger power was bigger than the NO, T & M's Dickson-built engines delivered in the same year. They received a more modest superheater installation, but later on were fitted with two Nicholson thermic syphons.
This quintet of latter-day Ten-wheelers had a relatively long stride under an average-sized boiler and grate.
| Specifications | ||||
|---|---|---|---|---|
| Class | TN-57 - 233 | TN-63 - 26.0 | TN-67- 30.5 | TN-69 - 29.6 |
| Locobase ID | 7753 | 7758 | 7816 | 7761 |
| Railroad | New Orleans, Texas & Mexico (NOT & M/MP) | New Orleans, Texas & Mexico (NOT & M/MP) | New Orleans, Texas & Mexico (NOT & M/MP) | New Orleans, Texas & Mexico (NOT & M/MP) |
| Whyte | 4-6-0 | 4-6-0 | 4-6-0 | 4-6-0 |
| Road Numbers | 233 | 301-306 | 361-362 | 385-389 |
| Gauge | Std | Std | Std | Std |
| Builder | Alco-Cooke | Dickson | Burnham, Williams & Co | Alco |
| Year | 1906 | 1903 | 1903 | 1921 |
| Valve Gear | Stephenson | Stephenson | Walschaert | Walschaert |
| Locomotive Length and Weight | ||||
| Driver Wheelbase | 11.50' | 13' | 14' | 15' |
| Engine Wheelbase | 21.33' | 23.58' | 25.08' | 26.92' |
| Ratio of driving wheelbase to overall engine wheebase | 0.54 | 0.55 | 0.56 | 0.56 |
| Overall Wheelbase (engine & tender) | 47.54' | 47.50' | 56.75' | 62.25' |
| Axle Loading (Maximum Weight per Axle) | ||||
| Weight on Drivers | 93000 lbs | 127000 lbs | 142550 lbs | 140000 lbs |
| Engine Weight | 123000 lbs | 162500 lbs | 188070 lbs | 187000 lbs |
| Tender Light Weight | 115000 lbs | 109200 lbs | 352330 lbs | 153000 lbs |
| Total Engine and Tender Weight | 238000 lbs | 271700 lbs | 540400 lbs | 340000 lbs |
| Tender Water Capacity | 5000 gals | 6500 gals | 6000 gals | 7500 gals |
| Tender Fuel Capacity (oil/coal) | 2300 gals | 1870 gals | 3300 gals | 3000 gals |
| Minimum weight per yard of rail on which locomotive could run | 51.67 lb rail | 70.56 lb rail | 79.19 lb rail | 77.78 lb rail |
| Geometry Relating to Tractive Effort | ||||
| Driver Diameter | 57" | 63" | 67" | 69" |
| Boiler Pressure | 180 psi | 185 psi | 210 psi | 200 psi |
| Cylinders (dia x stroke) | 18" x 24" | 20" x 26" | 21" x 26" | 21.5" x 26" |
| Tractive Effort | 20872 lbs | 25959 lbs | 30547 lbs | 29611 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.46 | 4.89 | 4.67 | 4.73 |
| Heating Ability | ||||
| Firebox Area | 135 sq. ft | 158 sq. ft | 165.70 sq. ft | 180 sq. ft |
| Grate Area | 24.50 sq. ft | 30.20 sq. ft | 43.90 sq. ft | 32.70 sq. ft |
| Evaporative Heating Surface | 1507 | 1451 | 1771 | 2145 |
| Superheating Surface | 265 | 354 | 485 | |
| Combined Heating Surface | 1507 | 1716 | 2125 | 2630 |
| Evaporative Heating Surface/Cylinder Volume | 213.20 | 153.48 | 169.91 | 196.34 |
| Computations Relating to Power Output (More Information) | ||||
| Robert LeMassena's Power Computation | 4410 | 5587 | 9219 | 6540 |
| Same as above plus superheater percentage | 4410 | 6449.79 | 10754.78 | 7746.05 |
| Same as above but substitute firebox area for grate area | 24300 | 33743.96 | 40593.77 | 42638.78 |
| Power L1 | 5278.60 | 9505.11 | 13016.54 | 15599.82 |
| Power MT | 375.40 | 495.00 | 603.93 | 736.96 |
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