Piggy-backing on a Southern Pacific order for its GS-6s was the Western Pacific, which took delivery of this sextet in 1943. http://www.wplives.com/motivepower/srosters/Class_481_Roster__/class_481-407_roster__.html (accessed 3 July 2006) shows that the unit price was $206,655.
According to Drury (1993), certain devices that held SP patents, like the oil burner, were removed, but the pointed smokebox remained. After World War II, the WP added smoke deflectors. The GS-64s went of service in the early 1950s, 485 operating last in October 1951 and both 483 and 486 closing out in January 1953. Three were then sold to the Southern Pacific for parts.
| Specifications | |
|---|---|
| Class | GS-64-77 |
| Locobase ID | 6681 |
| Railroad | Western Pacific (WP) |
| Whyte | 4-8-4 |
| Road Numbers | 481-486 |
| Gauge | Std |
| Builder | Lima |
| Year | 1943 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 20' |
| Engine Wheelbase | 45.83' |
| Ratio of driving wheelbase to overall engine wheebase | 0.44 |
| Overall Wheelbase (engine & tender) | 94.42' |
| Axle Loading (Maximum Weight per Axle) | 70237 lbs |
| Weight on Drivers | 280950 lbs |
| Engine Weight | 465100 lbs |
| Tender Light Weight | 397700 lbs |
| Total Engine and Tender Weight | 862800 lbs |
| Tender Water Capacity | 23300 gals |
| Tender Fuel Capacity (oil/coal) | 6000 gals |
| Minimum weight per yard of rail on which locomotive could run | 117.06 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 73.50" |
| Boiler Pressure | 260 psi |
| Cylinders (dia x stroke) | 27" x 30" |
| Tractive Effort | 65759 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.27 |
| Heating Ability | |
| Firebox Area | 451 sq. ft |
| Grate Area | 90.20 sq. ft |
| Evaporative Heating Surface | 4922 |
| Superheating Surface | 2086 |
| Combined Heating Surface | 7008 |
| Evaporative Heating Surface/Cylinder Volume | 247.58 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 23452 |
| Same as above plus superheater percentage | 30432.72 |
| Same as above but substitute firebox area for grate area | 152163.59 |
| Power L1 | 41575.61 |
| Power MT | 1304.98 |
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