South Pacific Coast 4-6-0 "Ten-wheeler" Locomotives of 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 Raildata collection. 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.)

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.

Specifications by Steve Llanso of Sweat House Media
Class23 / 6 / T-50
Locobase ID7838
RailroadSouth Pacific Coast (North Shore)
CountryUSA
Whyte4-6-0
Number in Class1
Road Numbers23 / 6 / 4
Gauge3'
Number Built1
BuilderBurnham, Parry, Williams & Co
Year1891
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)12.50
Engine Wheelbase (ft)21.67
Ratio of driving wheelbase to overall engine wheebase 0.58
Overall Wheelbase (engine & tender) (ft)41.25
Axle Loading (Maximum Weight per Axle) (lbs)19,000
Weight on Drivers (lbs)56,000
Engine Weight (lbs)74,000
Tender Loaded Weight (lbs)48,172
Total Engine and Tender Weight (lbs)122,172
Tender Water Capacity (gals)
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)31
Geometry Relating to Tractive Effort
Driver Diameter (in)48
Boiler Pressure (psi)160
High Pressure Cylinders (dia x stroke) (in)16" x 20"
Tractive Effort (lbs)14,507
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.86
Heating Ability
Firebox Area (sq ft)88.69
Grate Area (sq ft)13.70
Evaporative Heating Surface (sq ft)863
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)863
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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