Following a year after the Selwyn Eddy, this unamed PALCO stablemate had a bigger boiler and commensurately enlarged (but still small) wood-burning grate and firebox. These generated the steam for cylinders with 2" greater diameters. The tender held 3 cords of wood fuel.
After decades in service, the 29 was retired in 1961 not long after a major overhaul. Almost 25 years later, PALCO donated the 29 to the Northern Counties Logging Interpretive Association (NCLIA) in 1986. Its relatively short time of operation after the major overhaul and its storage for decades in a shed encouraged the NCLIA to consider rebuilding the engine.
This was a smaller Prairie than the two that preceded it on PALCO 'S roster, but it featured a change to oil fuel and a higher-pressure boiler.
Like the others, the 30 served for decades before being scrapped in 1955.
The Timberman article goes into considerable detail about what made this Prairie so suitable for logging operations. The 2-6-2 layout, combined with the equalizing setup, ensured "...a steady riding locomotive which is easy on both rails and flanges when traversing curves." Having already noted that PALCO''s routes included 6% grades and 35-degree curves, the report comments on the boiler's qualities: "High steaming capacity is essential to successful work on heavy grades." Their characterization of the firebox as possessing "ample volume" may be overstating the case, but the report highlights the longer tubes. [Not mentioned but of undoubted value must have been the high factor of adhesion.] And the Radley & Hunter wide-mouthed stack is eminently suited to arresting sparks from the wood-burning firebox.
The locomotive's namesake, Selwyn Eddy, was one of PALCO's founders, a company that exploited the Redwood Empire's great expanse of tall trees. The 27 operated for the TPL until its scrapping in 1955.
|Principal Dimensions by Steve Llanso of Sweat House Media|
|Railroad||Pacific Lumber Company (PALCO)||Pacific Lumber Company (PALCO)||Pacific Lumber Company (PALCO)|
|Number in Class||1||1||1|
|Builder||Baldwin||Baldwin||Burnham, Williams & Co|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||10 / 3.05||8.33 / 2.54||10 / 3.05|
|Engine Wheelbase (ft / m)||25.92 / 7.90||23.83 / 7.26||25.92 / 7.90|
|Ratio of driving wheelbase to overall engine wheebase||0.39||0.35||0.39|
|Overall Wheelbase (engine & tender) (ft / m)||47.92 / 14.61||47.92 / 14.61|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)|
|Weight on Drivers (lbs / kg)||90,000 / 40,823||90,000 / 40,823||81,750 / 37,081|
|Engine Weight (lbs / kg)||120,000 / 54,431||120,000 / 54,431||110,900 / 50,303|
|Tender Loaded Weight (lbs / kg)||60,000 / 27,216||70,000 / 31,752||60,000 / 27,216|
|Total Engine and Tender Weight (lbs / kg)||180,000 / 81,647||190,000 / 86,183||170,900 / 77,519|
|Tender Water Capacity (gals / ML)||3500 / 11.36||3000 / 11.36||3000 / 11.36|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||1000 / 3.80|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||50 / 25||50 / 25||45 / 22.50|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||52 / 1321||46 / 1168||52 / 1321|
|Boiler Pressure (psi / kPa)||160 / 11||180 / 12.40||180 / 12.40|
|High Pressure Cylinders (dia x stroke) (in / mm)||18" x 24" / 457x610||17" x 24" / 432x610||16" x 24" / 406x610|
|Tractive Effort (lbs / kg)||20,337 / 9224.72||23,070 / 10464.39||18,078 / 8200.05|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.43||3.90||4.52|
|Firebox Area (sq ft / m2)||127.70 / 11.86||116 / 10.78||114.60 / 10.65|
|Grate Area (sq ft / m2)||17.40 / 1.62||16 / 1.49||16 / 1.49|
|Evaporative Heating Surface (sq ft / m2)||1765 / 163.97||1556 / 144.56||1578 / 146.60|
|Superheating Surface (sq ft / m2)|
|Combined Heating Surface (sq ft / m2)||1765 / 163.97||1556 / 144.56||1578 / 146.60|
|Evaporative Heating Surface/Cylinder Volume||249.70||246.79||282.54|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||2784||2880||2880|
|Same as above plus superheater percentage||2784||2880||2880|
|Same as above but substitute firebox area for grate area||20,432||20,880||20,628|