Clover Valley Lumber 2-6-6-2 "Mallet Mogul" Locomotives in the USA
Class Details by Steve Llanso of Sweat House Media
Class 4 (Locobase 4053)
Data from [
], supplemented by DeGolyer, Vol 73, pp. 247+. See also C R Heimerdinger, "California's Baldwin Logging Mallets", Pacific News (March 1979) archived by trainlife.com at [] . Works number was 57684 in March 1924.
Like many of the logging locomotives supplied by Baldwin, this engine had split saddletanks on the boiler (one over each engine unit), which shortened the engine's wheelbase. In fact, this was the very first of the type to be delivered. The superheated boiler's steam was admitted through 8" (203 mm) piston valves to the HP cylinders and 12" (305 mm) piston valves to the larger LP cylinders.
This engine stayed with Clover Valley at Loyalton, Calif until 1956, when the Feather River Lumber Company took over the road and operated #4 for two more years before she went into semi-retirement as a stationary boiler for the Tahoe Timber Company. She ran on the Castro Point Railway in California for 7 years (1979-1986), after which she was stored in Fremont, CA.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 4 |
| Locobase ID | 4053 |
| Railroad | Clover Valley Lumber |
| Country | USA |
| Whyte | 2-6-6-2T |
| Number in Class | 1 |
| Road Numbers | 4 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1924 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 16 / 4.88 |
| Engine Wheelbase (ft / m) | 37.75 / 11.51 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.42 |
| Overall Wheelbase (engine & tender) (ft / m) | 37.75 / 11.51 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 182,000 / 82,554 |
| Engine Weight (lbs / kg) | 219,000 / 99,337 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 2500 / 9.47 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 1200 / 4542 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 51 / 25.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 45 / 1143 |
| Boiler Pressure (psi / kPa) | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 17" x 24" / 432x610 |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 26" x 24" / 660x610 |
| Tractive Effort (lbs / kg) | 36,711 / 16651.85 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.96 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 124 - 2" / 51 |
| Flues (number - dia) (in / mm) | 18 - 5.375" / 137 |
| Flue/Tube length (ft / m) | 17 / 5.18 |
| Firebox Area (sq ft / m2) | 128 / 11.89 |
| Grate Area (sq ft / m2) | 26.20 / 2.43 |
| Evaporative Heating Surface (sq ft / m2) | 1654 / 153.72 |
| Superheating Surface (sq ft / m2) | 358 / 33.27 |
| Combined Heating Surface (sq ft / m2) | 2012 / 186.99 |
| Evaporative Heating Surface/Cylinder Volume | 262.46 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 5240 |
| Same as above plus superheater percentage | 6183 |
| Same as above but substitute firebox area for grate area | 30,208 |
| Power L1 | 5610 |
| Power MT | 407.73 |