Firebox had combustion chamber and two Nicholson Thermic Syphons of 70 sq ft total heating surface, boiler fitted with Elesco feedwater heater. The Baldwin engines of 1928 had some slight differences; see Locobase 8511.
Al1 ten 4-8-2s handled the long-haul passenger trains such as the Sunshine Special, the Texan, and the Southerner.
The first 5 Mountains procured for passenger service by the T & P came from Schenectady in 1926 (See Locobase 229). The current entry describes the later 5 that arrived 3 years later. Al1 ten 4-8-2s handled the long-haul passenger trains such as the Sunshine Special, the Texan, and the Southerner.
Like the M-1s, the M-2s had boilers with combustion chamber and fireboxes equipped with two Nicholson Thermic Syphons of 70 sq ft total heating surface. Also like the M-1s, the M-2 boiler was fitted with Elesco feedwater heater. The differences were admittedly small: a slight increase in grate area and, consequently, in firebox heating surface and a more substantial reduction in superheater area.
| Specifications | ||
|---|---|---|
| Class | M-1 | M-2 |
| Locobase ID | 229 | 8511 |
| Railroad | Texas & Pacific (T & P) | Texas & Pacific (T & P) |
| Whyte | 4-8-2 | 4-8-2 |
| Road Numbers | 900-904 | 905-909 |
| Gauge | Std | Std |
| Builder | Alco-Schenectady | Baldwin |
| Year | 1926 | 1928 |
| Valve Gear | Walschaert | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 20' | 20' |
| Engine Wheelbase | 43.25' | 43.25' |
| Ratio of driving wheelbase to overall engine wheebase | 0.46 | 0.46 |
| Overall Wheelbase (engine & tender) | 84' | 84' |
| Axle Loading (Maximum Weight per Axle) | 61400 lbs | 61500 lbs |
| Weight on Drivers | 245500 lbs | 245600 lbs |
| Engine Weight | 360500 lbs | 361400 lbs |
| Tender Light Weight | 280100 lbs | 291666 lbs |
| Total Engine and Tender Weight | 640600 lbs | 653066 lbs |
| Tender Water Capacity | 14000 gals | 14000 gals |
| Tender Fuel Capacity (oil/coal) | 6000 gals | 6000 gals |
| Minimum weight per yard of rail on which locomotive could run | 102.29 lb rail | 102.33 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 73" | 73" |
| Boiler Pressure | 210 psi | 225 psi |
| Cylinders (dia x stroke) | 27" x 30" | 27" x 30" |
| Tractive Effort | 53477 lbs | 57296 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.59 | 4.29 |
| Heating Ability | ||
| Firebox Area | 404 sq. ft | 409 sq. ft |
| Grate Area | 80.30 sq. ft | 81.12 sq. ft |
| Evaporative Heating Surface | 3768 | 3774 |
| Superheating Surface | 1110 | 1032 |
| Combined Heating Surface | 4878 | 4806 |
| Evaporative Heating Surface/Cylinder Volume | 189.53 | 189.84 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 16863 | 18252 |
| Same as above plus superheater percentage | 20700.21 | 22171.28 |
| Same as above but substitute firebox area for grate area | 104145.54 | 111785.67 |
| Power L1 | 20277.66 | 20802.11 |
| Power MT | 728.38 | 746.92 |
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