Saginaw Timber Co 2-6-6-2 "Mallet Mogul" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 4061)

Data from http://loggingmallets.railfan.net, supplemented by DeGolyer, Vol 80, pp. 254+. Works numbers were 58272 in March 1925 and 60602 in August 1928.

Pair of Prairie Mallet full saddle tanks built by Baldwin for this logging road based in Brooklyn, Wash.. #4 with Saginaw until 1944, sold to White River (#7), later to Weyerhaeuser -- both in Enumclaw, Wash. #5 went from Saginaw to Bloedel, Stewart & Welch on Vancouver Island, BC. Both scrapped in the mid 1950s.

Specifications by Steve Llanso of Sweat House Media
Class4
Locobase ID4061
RailroadSaginaw Timber Co
CountryUSA
Whyte2-6-6-2T
Number in Class2
Road Numbers4-5
GaugeStd
Number Built2
BuilderBaldwin
Year1925
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)8 / 2.44
Engine Wheelbase (ft / m)37.75 / 11.51
Ratio of driving wheelbase to overall engine wheebase 0.21
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)220,000 / 99,790
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)220,000
Tender Water Capacity (gals / ML)2500 / 9.47
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)1000 / 3.80
Minimum weight of rail (calculated) (lb/yd / kg/m)51 / 25.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)200 / 13.80
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)37,545 / 17030.15
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.85
Heating Ability
Firebox Area (sq ft / m2)128 / 11.89
Grate Area (sq ft / m2)26.20 / 2.43
Evaporative Heating Surface (sq ft / m2)1654 / 153.66
Superheating Surface (sq ft / m2)358 / 33.26
Combined Heating Surface (sq ft / m2)2012 / 186.92
Evaporative Heating Surface/Cylinder Volume262.33
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5240
Same as above plus superheater percentage6183
Same as above but substitute firebox area for grate area30,208
Power L15486
Power MT398.72