Standard Baldwin compound articulated tank of the kind sold to several Western logging companies in the 1920s; this one had rectangular tanks. Like the other Baldwin mallet tanks, the HP cylinders on 7 had 8" (203 mm) piston valves and the LP used 12" (305 mm) piston valves. Its operating enviroment was based on 60 lb/yard (30 kg/metre) rails that bent around curves of up to 30 degrees and ascended 4% grades.
After 13 years with Ostrander, #7 was sold to Weyerhaeuser as #5 in 1939 and ran for 10 years with that company (1940-1950).
Rich Wilken's detailed account notes that soon after its arrival, Weyerhaeuser removed much of the side tank capacity, substituting a long 8,000 US gallon (30,280 litre) cylindrical tender. This vessel started its career as a tank car. During its converson to tender use, a front section reserved for more oil fuel, while the rear carried the water needed to operate in the dry Klamath Falls area. Cutting down the engine's tanks improved forward visibility, says Wilkens, and provided convenient pockets to carry scrap metal whose weight partially compensated for the reduction in adhesion weight caused by eliminating the 12 tons of water in full tanks.
Kosmos Timber and United States Plywood operated this engine as #11 until 1960. After 13 years on display, she was restored to tourist operation, in which she served for 16 years.
From 1990, the 11 rested in storage at the Northwest Railway Museum of Snoqualmie, Wash. . Museum volunteers began a cosmetic restoration in 2002.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Ostrander Rwy & Timber Co.|
|Number in Class||1|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.21|
|Overall Wheelbase (engine & tender)||37.75'|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||210000 lbs|
|Engine Weight||245500 lbs|
|Tender Light Weight|
|Total Engine and Tender Weight||245500 lbs|
|Tender Water Capacity||3200 gals|
|Tender Fuel Capacity (oil/coal)||1200 gals|
|Minimum weight of rail (calculated)||58 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||200 psi|
|High Pressure Cylinders (dia x stroke)||18" x 24"|
|Low Pressure Cylinders (dia x stroke)||28" x 24" (2)|
|Tractive Effort||42517 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.94|
|Firebox Area||128 sq. ft|
|Grate Area||26.20 sq. ft|
|Evaporative Heating Surface||1654 sq. ft|
|Superheating Surface||358 sq. ft|
|Combined Heating Surface||2012 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||233.99|
|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||30208|