Carolina, Clinchfield & Ohio 4-6-6-4 "Challenger" Locomotives in 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 Rail Data Exchange. (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 (7.25 sq m) 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 Denver & Rio Grande Western L-97 entry at Locobase 16358.

Principal Dimensions 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 Wheelbase (ft / m)24.34 / 7.42
Engine Wheelbase (ft / m)59.92 / 18.26
Ratio of driving wheelbase to overall engine wheebase 0.41
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)70,000 / 31,752
Weight on Drivers (lbs / kg)420,000 / 190,509
Engine Weight (lbs / kg)607,000 / 275,331
Tender Loaded Weight (lbs / kg)396,300 / 179,759
Total Engine and Tender Weight (lbs / kg)1,003,300 / 455,090
Tender Water Capacity (gals / ML)22,500 / 85.23
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)26 / 23.60
Minimum weight of rail (calculated) (lb/yd / kg/m)117 / 58.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)69 / 1753
Boiler Pressure (psi / kPa)265 / 18.30
High Pressure Cylinders (dia x stroke) (in / mm)22" x 32" / 559x813 (4)
Tractive Effort (lbs / kg)101,121 / 45867.77
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.15
Heating Ability
Firebox Area (sq ft / m2)636 / 59.09
Grate Area (sq ft / m2)108 / 10.04
Evaporative Heating Surface (sq ft / m2)5392 / 501.12
Superheating Surface (sq ft / m2)1680 / 156.13
Combined Heating Surface (sq ft / m2)7072 / 657.25
Evaporative Heating Surface/Cylinder Volume191.49
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation28,620
Same as above plus superheater percentage35,489
Same as above but substitute firebox area for grate area208,990
Power L125,642
Power MT807.58

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Wes Barris