The 7 was a typical small saddle-tank logging Prairie with the less common feature of superheating. Its large cylinder volume put a high demand on steam-making using either coal or wood and the hotter steam required 9 1/2" (241 mm) piston valves. Grades could reach 7% and curves tightened to 40 degrees. The 1 was required in the specs to take four cars each weighing 16 tons up that 7% grade at 10 mph (16 kmh).
A "Hereafter" note dated 23 November 1923 advises:"Raise question regarding design of rear engine truck and clearances from equal[izing] beam. Also raise question regarding application of brakes to the rear engine truck."
Hedlund Box , an active timber harvester and mill, had only recently taken delivery of the 1 when it secured an agreement with the Department of the Interior to log the Colville Indian Reservation in 1924. The total bid for rights to extract 240 million feet of Western White Pine and 113 million feet of fir came to $749,000 and covered 121,000 acres. "Twenty years from now", said an optimistic report "Hedlund Concern Gets Timber Cut" in the Spokane Chronicle of 26 January 1924, " the Hedlund Box and Lumber Company will still be cutting timber."
HB&LC soon sold the 1 to Lyon Hill & Company, which soon sold out to the Port Angeles Western. Before 1926, the PAW sold the 1 to the Lorenz Lumber Company of Klamath Falls, Ore, which soon sold out to Crater Lake Lumber. Unusually, the engine kept its original road number throughout this flurry of ownership changes.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Hedlund Box & Lumber Company|
|Number in Class||1|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.38|
|Overall Wheelbase (engine & tender)||25.33'|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||105000 lbs|
|Engine Weight||134500 lbs|
|Tender Light Weight|
|Total Engine and Tender Weight||134500 lbs|
|Tender Water Capacity||1800 gals|
|Tender Fuel Capacity (oil/coal)||3 tons|
|Minimum weight of rail (calculated)||58 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||165 psi|
|Cylinders (dia x stroke)||17" x 24"|
|Tractive Effort||22109 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.75|
|Firebox Area||74 sq. ft|
|Grate Area||16.30 sq. ft|
|Evaporative Heating Surface||804 sq. ft|
|Superheating Surface||188 sq. ft|
|Combined Heating Surface||992 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||127.52|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||2690|
|Same as above plus superheater percentage||3201|
|Same as above but substitute firebox area for grate area||14530|