Saginaw Timber Co 2-6-6-2 Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 4061)

Data from, 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
Locobase ID4061
RailroadSaginaw Timber Co
Number in Class2
Road Numbers4-5
Number Built2
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase8'
Engine Wheelbase37.75'
Ratio of driving wheelbase to overall engine wheebase 0.21
Overall Wheelbase (engine & tender)37.75'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers182000 lbs
Engine Weight220000 lbs
Tender Light Weight
Total Engine and Tender Weight220000 lbs
Tender Water Capacity2500 gals
Tender Fuel Capacity (oil/coal)1000 gals
Minimum weight of rail (calculated)51 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"
Boiler Pressure200 psi
High Pressure Cylinders (dia x stroke)17" x 24"
Low Pressure Cylinders (dia x stroke)26" x 24" (2)
Tractive Effort37545 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.85
Heating Ability
Firebox Area128 sq. ft
Grate Area26.20 sq. ft
Evaporative Heating Surface1654 sq. ft
Superheating Surface358 sq. ft
Combined Heating Surface2012 sq. ft
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 area30208
Power L15486
Power MT398.72

If you have any railroad data such as diagram books, rail station plans or anything else that you would be willing to share, please contact us.