Regardless of the detailed calculations described below, these Ten-wheelers can be more easily described as typical logging 4-6-0s.
When the Gray Lumber tracks were abandoned in 1917, the 10 went briefly to the Tidewater & Western, then to the Ohio River & Western as their #4. The OR & W was absorbed by the Pennsylvania Railroad in 1920 at which time the 4 was renumbered 9660 and dropped into the catchall G odd class.
It was scrapped in March 1933.
NB: Locobase 2024 shows the Pittsburgh & Western Ten-wheeler of 1890 and uses the specs from the earlier engine to estimate the surface areas of the wood-burning 4-6-0s delivered 16 and 22 years later.
Locobase derives the figures as follows: The tube areas were identical because the number, diameter, and length of that component in each locomotive was the same. The firebox area in the earlier engine is stated in its specs to be 70 sq ft. When Locobase compared the dimensions of the two firebox, he found the lengths and widths to be identical to the 16th of an inch. The heights given for the front and back of the firebox are exactly 3" higher in the later engine than in the earlier one. Calculating the area of the rectangle formed by the difference between the two heights x the length (3 sq ft, when both sides are added together) and adding that to the area of the difference of the front and back (2 sq ft) yields the number used in this entry's specs.
The lightly built GLC could only manage the lightest locomotives and this 4-6-0 was one of the smallest of its wheel arrangement. When the Gray line closed in 1917, the 11 was sold to Virginia Lumber & Box Company.
[NB:Another Ten-wheeler built for the Gray Lumber Company in June 1906 (works number 28395) had very similar dimensions to the Pittsburgh & Western Mogul shown in Locobase 2024, including tube count and length and grate area. Baldwin did not calculate heating surfaces for either locomotive. There is no separate record for these engines because Locobase can only determine that the firebox height was several inches greater, but not the impact of that difference on firebox heating surface.]
Typical wood-burning logging Prairie served this Hosford, Fla lumber company. Like many such employers, the Graves brothers built the town from scratch. All of the facilities were electrified and included workers' housing, company store, offices, and a hotel. By 1917, their railway included 30 miles (48 km) of logging road.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Gray Lumber Company||Gray Lumber Company||Graves Lumber Company|
|Number in Class||2||1||1|
|Road Numbers||10, 12||11||5|
|Builder||Baldwin||Burnham, Williams & Co||Baldwin|
|Locomotive Length and Weight|
|Driver Wheelbase (ft)||10.92||9.50||13|
|Engine Wheelbase (ft)||19.42||17.67||24|
|Ratio of driving wheelbase to overall engine wheebase||0.56||0.54||0.54|
|Overall Wheelbase (engine & tender) (ft)||43.21||45.58|
|Axle Loading (Maximum Weight per Axle) (lbs)|
|Weight on Drivers (lbs)||52,350||45,000||72,000|
|Engine Weight (lbs)||67,280||58,000||100,000|
|Tender Loaded Weight (lbs)||40,000||40,000||60,000|
|Total Engine and Tender Weight (lbs)||107,280||98,000||160,000|
|Tender Water Capacity (gals)||2000||1800||3000|
|Tender Fuel Capacity (oil/coal) (gals/tons)|
|Minimum weight of rail (calculated) (lb/yd)||29||25||40|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in)||44||40||46|
|Boiler Pressure (psi)||160||160||160|
|High Pressure Cylinders (dia x stroke) (in)||14" x 20"||13" x 18"||16" x 24"|
|Tractive Effort (lbs)||12,116||10,343||18,165|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.32||4.35||3.96|
|Firebox Area (sq ft)||75||57.80||107|
|Grate Area (sq ft)||11.80||9.80||16|
|Evaporative Heating Surface (sq ft)||807||614||1410|
|Superheating Surface (sq ft)|
|Combined Heating Surface (sq ft)||807||614||1410|
|Evaporative Heating Surface/Cylinder Volume||226.47||222.04||252.46|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||1888||1568||2560|
|Same as above plus superheater percentage||1888||1568||2560|
|Same as above but substitute firebox area for grate area||12,000||9248||17,120|