Southern Pacific 4-2-4 Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class C.P. Huntington (Locobase 4133)

(Thanks to Chris Hohl for his emails (for example the one from 30 August 2017) reporting the Huntington's fuel capacity and valve gear. and supplying a copy of the Southern Pacific's scale drawing completed 11 November 1936, showing the locomotive in its 1914 configuration.) Works number was 277 in October 1863.

As the Central Pacific began pressing East into the mountains in the mid-1860s, the railroad was desparate for motive power from any source. Because of the Civil War, however, only these two small and oddly arranged tanks were available. So it was that the Huntington and a sister later named T D Judah (works number 325 in November 1863) arrived in San Francisco on 19 March 1864 aboard the ship MARY ROBINSON.

After the CP was completed and reorganized as the Southern Pacific, the Huntington took engine #1. It proved too small for revenue service for many reasons, not the least of which was the puny wood fuel capacity of 3/4 of a cord. So it became a construction engine, operating between San Jose and Hollister. Later it operated in the Bay Area for many years, ending its active service as a weed burner.

By 1894, nostalgia for simpler days led to the Huntington's preservation (#2 TD Judah was scrapped). After many years as an exhibit, it was restored to its 1914 configuration by the California State Railroad Museum in 1980.

Principal Dimensions by Steve Llanso of Sweat House Media
ClassC.P. Huntington
Locobase ID4133
RailroadSouthern Pacific (SP)
Number in Class2
Road Numbers1-2
Number Built2
BuilderDanforth, Cooke
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)
Engine Wheelbase (ft / m)21.17 / 6.45
Ratio of driving wheelbase to overall engine wheebase
Overall Wheelbase (engine & tender) (ft / m)21.17 / 6.45
Axle Loading (Maximum Weight per Axle) (lbs / kg)15,980 / 7248
Weight on Drivers (lbs / kg)15,980 / 7248
Engine Weight (lbs / kg)43,500 / 19,731
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)43,500
Tender Water Capacity (gals / ML)300 / 1.14
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)27 / 13.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)54 / 1372
Boiler Pressure (psi / kPa)125 / 8.60
High Pressure Cylinders (dia x stroke) (in / mm)11" x 15" / 279x381
Tractive Effort (lbs / kg)3571 / 1619.78
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.47
Heating Ability
Firebox Area (sq ft / m2)58 / 5.39
Grate Area (sq ft / m2) 9.39 / 0.87
Evaporative Heating Surface (sq ft / m2)419 / 38.94
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)419 / 38.94
Evaporative Heating Surface/Cylinder Volume253.96
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1174
Same as above plus superheater percentage1174
Same as above but substitute firebox area for grate area7250
Power L14834
Power MT666.90

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Wes Barris