The 12's specification has a typical notation for a Baldwin Prairie headed for a logging tram road:"Spring rigging throughout engine and tender to be extra heavy for very roughest service and track." The 11's equalizers and springs had proven too weak, according to the spec.
The 11 served the Southern Pine Lumber Company until it was scrapped in 1957. The 12 was sold to Pickering Lumber Company. Renumbered 25, the engine served for years more. It was scrapped in May 1939.
This small logging Prairie's cylinders were supplied through 8" (203 mm) piston valves. Although its tender was lettered for Southern Pine Lumber Company, the engine ran on the SPLC's railway. In that service, it confronted ruling grades of 1 to 3% and maximum grades (probably on spurs) of 6%.
By 1936, the 14 had moved to Temple Lumber Company.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Texas South-Eastern||Texas South-Eastern|
|Number in Class||2||1|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.38||0.38|
|Overall Wheelbase (engine & tender)||50.67'||47.25'|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||87400 lbs||81000 lbs|
|Engine Weight||114200 lbs||107000 lbs|
|Tender Light Weight||90000 lbs||110000 lbs|
|Total Engine and Tender Weight||204200 lbs||217000 lbs|
|Tender Water Capacity||4500 gals||3500 gals|
|Tender Fuel Capacity (oil/coal)||6 tons||1200 gals|
|Minimum weight of rail (calculated)||49 lb/yard||45 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||170 psi||180 psi|
|Cylinders (dia x stroke)||17" x 24"||16" x 24"|
|Tractive Effort||22778 lbs||19584 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||3.84||4.14|
|Firebox Area||121 sq. ft||110 sq. ft|
|Grate Area||18.20 sq. ft||16.50 sq. ft|
|Evaporative Heating Surface||1552 sq. ft||1091 sq. ft|
|Superheating Surface||222 sq. ft|
|Combined Heating Surface||1552 sq. ft||1313 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||246.15||195.34|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||3094||2970|
|Same as above plus superheater percentage||3094||3475|
|Same as above but substitute firebox area for grate area||20570||23166|