Originally delivered in 1917 with Jacobs-Shupert fireboxes; see Locobase 8535. These leaked and were generally unsatisfactory. Only in 1937, however, were these rebuilt as the powerful 4-6-4s as shown here. Frisco mechanics substantially increased grate and firebox areas and the firebox heating surface was enhanced by one thermic syphon. Inside the boiler, installation of 10 more superheater flues in place of several dozen tubes resulted in an increase in superheater area of 240 sq ft.
Rebuilds occurred as follows: 1062, 1064, 1065, 1066, 1069 in 1937; 1063, 1068 in 1940; and 1060, 1061, and 1067 in 1941. The 1951 diagram book notes that the class was "dismissed from service" between 23 October 1950 and 23 January 1952.
| Specifications | |
|---|---|
| Class | 1060 |
| Locobase ID | 165 |
| Railroad | St Louis-San Francisco (SLSF) |
| Whyte | 4-6-4 |
| Road Numbers | 1060-1069 |
| Gauge | Std |
| Builder | Baldwin |
| Year | 1937 |
| Valve Gear | Baker |
| Locomotive Length and Weight | |
| Driver Wheelbase | 13' |
| Engine Wheelbase | 38.83' |
| Ratio of driving wheelbase to overall engine wheebase | 0.33 |
| Overall Wheelbase (engine & tender) | 83.71' |
| Axle Loading (Maximum Weight per Axle) | 64000 lbs |
| Weight on Drivers | 189400 lbs |
| Engine Weight | 360960 lbs |
| Tender Light Weight | 242000 lbs |
| Total Engine and Tender Weight | 602960 lbs |
| Tender Water Capacity | 13300 gals |
| Tender Fuel Capacity (oil/coal) | 4500 gals |
| Minimum weight per yard of rail on which locomotive could run | 105.22 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 74" |
| Boiler Pressure | 225 psi |
| Cylinders (dia x stroke) | 26" x 28" |
| Tractive Effort | 48919 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.87 |
| Heating Ability | |
| Firebox Area | 351 sq. ft |
| Grate Area | 82.55 sq. ft |
| Evaporative Heating Surface | 3976 |
| Superheating Surface | 1235 |
| Combined Heating Surface | 5211 |
| Evaporative Heating Surface/Cylinder Volume | 231.08 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 18573.75 |
| Same as above plus superheater percentage | 22975.70 |
| Same as above but substitute firebox area for grate area | 97691.97 |
| Power L1 | 27169.33 |
| Power MT | 948.75 |
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