Carolina, Clinchfield & Ohio 4-6-6-4 "Challenger" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class E-1/E-2 (Locobase 337)

Data from tables in 1947 Locomotive Cyclopedia, substantially supplemented by Clinch 1948 Locomotive Diagram supplied in May 2005 by Allen Stanley from his extensive Raildata collection. (Thanks to Chris Hohl for his 14 March 2012 email noting the road numbers for the E-1 and E-2s and for correcting the valve gear.) Works numbers were 69998-70005 in January 1943 and 75464-75467 in November 1947.

The E-1 & E-2 were virtually identical to the earlier D&H J-95s although the Clinchfield locos had a higher adhesion weight and larger piston diameter. Firebox heating surface included 78 sq ft of arch tubes. See Locobase 338 for a description of the revised bearing design that permitted smooth riding at high speeds.

Eight E-1s were delivered in 1942-1943, four E-2 in 1947. Both classes retired by 1954; the E-1s were scrapped in September and October 1955. E-2s remained on the roster until they were sold as a batch to D Joseph in December 1962 for scrap.

For the six Clinchfield E-3s, see the Union Pacific entry (Locobase 1345).

Specifications by Steve Llanso of Sweat House Media
Locobase ID337
RailroadCarolina, Clinchfield & Ohio (Clinchfield)
Number in Class12
Road Numbers650-657. 660-663
Number Built12
Valve GearBaker
Locomotive Length and Weight
Driver Wheelbase12.17'
Engine Wheelbase59.92'
Ratio of driving wheelbase to overall engine wheebase 0.20
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)70000 lbs
Weight on Drivers420000 lbs
Engine Weight607000 lbs
Tender Light Weight396300 lbs
Total Engine and Tender Weight1003300 lbs
Tender Water Capacity22500 gals
Tender Fuel Capacity (oil/coal)26 tons
Minimum weight of rail (calculated)117 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter69"
Boiler Pressure265 psi
Cylinders (dia x stroke)22" x 32"
Tractive Effort101121 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.15
Heating Ability
Firebox Area636 sq. ft
Grate Area108 sq. ft
Evaporative Heating Surface5392 sq. ft
Superheating Surface1680 sq. ft
Combined Heating Surface7072 sq. ft
Evaporative Heating Surface/Cylinder Volume191.49
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation28620
Same as above plus superheater percentage35489
Same as above but substitute firebox area for grate area208990
Power L125642
Power MT807.58


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