The specs for this logging Prairie tank include some details that shed some light on the requirements of a small, special-purpose railroad. The ORT was based in Cowlitz County, Washington State, and formed in 1896 by E S Collins; at the time, it was the third logging railroad in the Northwest. It started with 12 miles of standard-gauge roads and all kinds of geared locomotives including Climaxes, Heislers, and Shays. Rail weights fell in the 40-56 lb/yard (20-28 kg/metre) range.
The 4 was a rod-driven engine for which flexibility and readiness were key attributes on a road that had ruling grades of 3.7% and compensated curves arcing as tightly as 30 degrees (radii of 193 ft/58.8 metres). The engine was to be delivered with coal-burning grates in place: "The finger bars are to have 4" [102 mm] space between fingers." But wood-burning had to be catered to as well: "B.L.W. will furnish cast iron plates as sketch [sic] These to be laid on the bars when engine leaves here to enable it to go into service as a wood burner." There's no estimate on how much firebox volume would be reduced, but it was likely a small amount.
Concessions to crew convenience and operating safety appear a little later. The cab and fuel box were each to have handles "of such length that a man can reach the same from a point say [sic] 3' 0" below top of rail and have steps of sufficient length." The fuel box had a wood rack around its top. And a concern about inadvertently bumping the logs with the rear of the engine when rounding curves was addressed by reducing the overhang from the rear drivers to the back bumper "to be as short as possible ...the fuel box not to extend back of the bumper to avoid striking logs."
Withal, this first 4 only operated about 17 years before being relegated to service as a "plant facility" in 1925. It was replaced by 2-6-6-2T #7 (Locobase 4058).
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Ostrander Railway & Timber Company|
|Number in Class||1|
|Builder||Burnham, Williams & Co|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.43|
|Overall Wheelbase (engine & tender)||21.92'|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||53000 lbs|
|Engine Weight||73000 lbs|
|Tender Light Weight|
|Total Engine and Tender Weight||73000 lbs|
|Tender Water Capacity||900 gals|
|Tender Fuel Capacity (oil/coal)|
|Minimum weight of rail (calculated)||29 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||160 psi|
|Cylinders (dia x stroke)||13.5" x 18"|
|Tractive Effort||12058 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.40|
|Firebox Area||81.70 sq. ft|
|Grate Area||12.50 sq. ft|
|Evaporative Heating Surface||665 sq. ft|
|Combined Heating Surface||665 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||223.00|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||2000|
|Same as above plus superheater percentage||2000|
|Same as above but substitute firebox area for grate area||13072|