The Western Pacific Railroad took delivery of six 4-8-4s, Class GS-64 (road numbers 481 through 486) from the Lima Locomotive Works in 1943. These Northerns had 73.5 drivers, 27 x 30 cylinders, a 260 psi boiler pressure, weighed 466,100 pounds and had a tractive effort of 64,200 pounds.
Data from WP 3 - 1949 Steam locomotive diagram book supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. Works numbers were 8017-8022 in June 1943.
Piggy-backing on the first of two Southern Pacific orders for its GS-6s was the Western Pacific, which took delivery of this sextet in 1943. [
Principal Dimensions by Steve Llanso of Sweat House Media | |
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Class | GS-64-77 |
Locobase ID | 6681 |
Railroad | Western Pacific (WP) |
Country | USA |
Whyte | 4-8-4 |
Number in Class | 6 |
Road Numbers | 481-486 |
Gauge | Std |
Number Built | 6 |
Builder | Lima |
Year | 1943 |
Valve Gear | Walschaert |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 20 / 6.10 |
Engine Wheelbase (ft / m) | 45.83 / 13.97 |
Ratio of driving wheelbase to overall engine wheelbase | 0.44 |
Overall Wheelbase (engine & tender) (ft / m) | 94.42 / 28.78 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | 70,237 / 31,859 |
Weight on Drivers (lbs / kg) | 280,950 / 127,437 |
Engine Weight (lbs / kg) | 465,100 / 210,966 |
Tender Loaded Weight (lbs / kg) | 397,700 / 180,394 |
Total Engine and Tender Weight (lbs / kg) | 862,800 / 391,360 |
Tender Water Capacity (gals / ML) | 23,300 / 88.26 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 6000 / 22,710 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 117 / 58.50 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 73.50 / 1867 |
Boiler Pressure (psi / kPa) | 260 / 17.90 |
High Pressure Cylinders (dia x stroke) (in / mm) | 27" x 30" / 686x762 |
Tractive Effort (lbs / kg) | 65,759 / 29827.82 |
Booster (lbs) | 13,300 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.27 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 49 - 2.25" / 57 |
Flues (number - dia) (in / mm) | 198 - 3.5" / 89 |
Flue/Tube length (ft / m) | 21.50 / 6.55 |
Firebox Area (sq ft / m2) | 451 / 41.90 |
Grate Area (sq ft / m2) | 90.20 / 8.38 |
Evaporative Heating Surface (sq ft / m2) | 4922 / 457.43 |
Superheating Surface (sq ft / m2) | 2086 / 193.87 |
Combined Heating Surface (sq ft / m2) | 7008 / 651.30 |
Evaporative Heating Surface/Cylinder Volume | 247.59 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 23,452 |
Same as above plus superheater percentage | 30,488 |
Same as above but substitute firebox area for grate area | 152,438 |
Power L1 | 41,576 |
Power MT | 1304.99 |