South Pacific Coast 4-6-0 "Ten-Wheeler" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 18 (Locobase 11847)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Vol 13, p. 35. Works numbers were 7939 and 7941 in May 1886 and 8486-8487 in April 1887.

It's not clear if these Ten-wheelers stayed on the same metals during their long careers, but they were narrow-gaugers in the Sierras to the end. They were designed to meet 2 1/2% grades (126-ft rise to the mile) and 16-deg curves.

After the SPC was redubbed the SPC (North Shore), three of the engines remained under that herald until sold in April 1906 to the Nevada & California (see Locobase 8700). The 16 (ex-19) was rebuilt in 1921 and operated until 1935. 14 (ex-18) was converted to a stationary boiler in Colfax, Calif in 1945 and lasted until it was scrapped in October 1951. 17 (ex-21) was similarly treated and scrapped in April 1952.

20 was sold in January 1908 to the Northwestern Pacific as their 144. Apparently rebuilt with a new boiler, it is described separately in Locobase 8170.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID11,847
RailroadSouth Pacific Coast
Number in Class4
Road Numbers18-21/T-51
Number Built4
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.50 / 3.81
Engine Wheelbase (ft / m)21.83 / 6.65
Ratio of driving wheelbase to overall engine wheebase 0.57
Overall Wheelbase (engine & tender) (ft / m)41.50 / 12.65
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)
Tender Water Capacity (gals / ML)2000 / 7.58
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 1219
Boiler Pressure (psi / kPa)130 / 9
High Pressure Cylinders (dia x stroke) (in / mm)16" x 20" / 406x508
Tractive Effort (lbs / kg)11,787 / 5346.50
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Firebox Area (sq ft / m2)81.19 / 7.55
Grate Area (sq ft / m2)14.20 / 1.32
Evaporative Heating Surface (sq ft / m2)890 / 82.71
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)890 / 82.71
Evaporative Heating Surface/Cylinder Volume191.22
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1846
Same as above plus superheater percentage1846
Same as above but substitute firebox area for grate area10,555
Power L12896
Power MT

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