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

Class Details by Steve Llanso of Sweat House Media

Class 23/6/T-50 (Locobase 7838)

Data from OWRR&NCo 1 - 1930 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 17, p. 41. Works number was 11925 in May 1891. (9929 from April 1889 took road number 22 and may have been built to the same design, but Locobase cannot confirm.)

The 1891 specs reflect an earlier design from the later boiler shown in the specs. Pressure was set to a typical 130 psi (9 bar)--30 psi lower than the later figure--and 131 tubes occupied the boiler. On the other hand, the steel firebox's dimensions appear to have been unchanged. The operating environment included grades as steep as 126 ft/mile (2.35%) and curves as tight as 16 deg.

After serving on the SPC (NS) for 16 years, the 23 was sold in 1907 to the Ilwaco Railway & Navigation Company for $5,700. This narrow-gauge railway had a colorful and always tenuous existence that was mercifully terminated in 1910 when it was taken over by the Union Pacific's Oregon-Washington Railroad & Navigation Company. That railroad renumbered this engine as N (narrow gauge) 4 and operated it until 1931, when the line was closed.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID7838
RailroadSouth Pacific Coast (North Shore)
Number in Class1
Road Numbers23/6/4
Number Built1
BuilderBurnham, Parry, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.50 / 3.81
Engine Wheelbase (ft / m)21.67 / 6.61
Ratio of driving wheelbase to overall engine wheebase 0.58
Overall Wheelbase (engine & tender) (ft / m)41.25 / 12.57
Axle Loading (Maximum Weight per Axle) (lbs / kg)19,000 / 8618
Weight on Drivers (lbs / kg)56,000 / 25,401
Engine Weight (lbs / kg)74,000 / 33,566
Tender Loaded Weight (lbs / kg)48,172 / 21,850
Total Engine and Tender Weight (lbs / kg)122,172 / 55,416
Tender Water Capacity (gals / ML)2000
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)31 / 15.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 1448
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)16" x 20" / 406x610
Tractive Effort (lbs / kg)14,507 / 6580.27
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.86
Heating Ability
Firebox Area (sq ft / m2)88.69 / 8.24
Grate Area (sq ft / m2)13.70 / 1.27
Evaporative Heating Surface (sq ft / m2)863 / 80.20
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)863 / 80.20
Evaporative Heating Surface/Cylinder Volume185.42
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2192
Same as above plus superheater percentage2192
Same as above but substitute firebox area for grate area14,190
Power L13593
Power MT424.35

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