Simpson Logging 2-6-6-2 "Mallet Mogul" Locomotives in the USA
Class Details by Steve Llanso of Sweat House Media
Class Sophus Jacobson (Locobase 4062)
Data from [
], supplemented by DeGolyer, Volume 80, pp. 298+. Works number was 59173 in May 1926.
Split saddle-tanker served Simpson Logging on their Peninsular Railway in Shelton, Wash, where the specifications indicated a maximum grade of 5% (or "possibly 6%") on 60 lb/yard (30 kg/metre) rail around 30 degree (193 foot/59 metre radii).
Like the other Baldwin 2-6-6-2 tanks, all four of 13's cylinders were served by piston valves--8" (203 mm) diameter for HP, 12" (305 mm) for the LP cylinders.
The 13 put in 30 years beforel her retirement in 1956, after which she was scrapped.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Sophus Jacobson |
| Locobase ID | 4062 |
| Railroad | Simpson Logging |
| Country | USA |
| Whyte | 2-6-6-2T |
| Number in Class | 1 |
| Road Numbers | 13 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1926 |
| 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) | 200,000 / 90,719 |
| Engine Weight (lbs / kg) | 238,000 / 107,955 |
| 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) | 1000 / 3785 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 56 / 28 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 44 / 1118 |
| Boiler Pressure (psi / kPa) | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 24" / 457x610 |
| Low Pressure Cylinders (dia x stroke) (in / mm) | 28" x 24" / 711x610 |
| Tractive Effort (lbs / kg) | 42,517 / 19285.41 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.70 |
| 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 | 234.09 |
| 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 | 4730 |
| Power MT | 312.84 |