http://espee.railfan.net/sp_steam_mm-03.html (visited 19 August 2005) notes that these Mallet Moguls originally operated on the Arizonan mining road headquartered in Jerome (which lies 100 miles north of Phoenix) and working the copper mines at Cleopatra Hill.
After 23 years, the Espee obtained the pair in 1943 to operate on Beaumont Hill near Los Angeles. Still running as compounds, they added 8 years (3931) and 11 years (3930) to their service records before retirement.
The Espee diagram notes that the firebox was fitted with 5 thermic syphons. A Stan Kistler photograph hosted on http://www.divisionpoint.com/photos/SP_MM-3s/SP_3930b.gif (19 August 2005) shows counterbalancing that filled half the driver disk on the third axle.
| Specifications | |
|---|---|
| Class | MM-3 |
| Locobase ID | 6766 |
| Railroad | Verde Tunnel & Smelter |
| Whyte | 2-6-6-2 |
| Road Numbers | 3930-3931 |
| Gauge | Std |
| Builder | Alco-Schenectady |
| Year | 1920 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 10.33' |
| Engine Wheelbase | 48.83' |
| Ratio of driving wheelbase to overall engine wheebase | 0.21 |
| Overall Wheelbase (engine & tender) | |
| Axle Loading (Maximum Weight per Axle) | 62700 lbs |
| Weight on Drivers | 376000 lbs |
| Engine Weight | 447000 lbs |
| Tender Light Weight | |
| Total Engine and Tender Weight | 447000 lbs |
| Tender Water Capacity | |
| Tender Fuel Capacity (oil/coal) | |
| Minimum weight per yard of rail on which locomotive could run | 104.44 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 57" |
| Boiler Pressure | 220 psi |
| Cylinders (dia x stroke) | 23.5" x 32" |
| Low Pressure Cylinders (dia x stroke) | 37" x 32" |
| Tractive Effort | 82623 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.55 |
| Heating Ability | |
| Firebox Area | 360 sq. ft |
| Grate Area | 72 sq. ft |
| Evaporative Heating Surface | 4907 |
| Superheating Surface | 1139 |
| Combined Heating Surface | 6046 |
| Evaporative Heating Surface/Cylinder Volume | 305.46 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 15840 |
| Same as above plus superheater percentage | 18824.08 |
| Same as above but substitute firebox area for grate area | 94120.41 |
| Power L1 | 8900.03 |
| Power MT | 313.10 |
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