Delaware & Hudson 4-6-6-4 "Challenger" Type Locomotives

Class J-95 (Locobase 338)

Data from tables in 1947 Locomotive Cyclopedia. Firebox heating surface included 5 thermic syphons of 77 sq ft total.

Considered by many observers to be the handsomest of the Challenger type. Forty engines -- 1500-1519 purchased in 1940 (builder's numbers 69297-69316), 1520-1534 (70006-70020) over next 2 years, and 1535-1539 (74666-74670) procured in 1946. All were disposed off in 10 months from October 1952 to August 1953.

Specifications
ClassJ-95
Locobase ID338
RailroadDelaware & Hudson
Whyte4-6-6-4
Road Numbers1500-1539
GaugeStd
BuilderAlco-Schenectady
Year1940
Valve GearWalschaert
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)
Weight on Drivers406500 lbs
Engine Weight597000 lbs
Tender Light Weight311800 lbs
Total Engine and Tender Weight908800 lbs
Tender Water Capacity22500 gals
Tender Fuel Capacity (oil/coal)26 tons
Minimum weight per yard of rail on which locomotive could run112.92 lb rail
Geometry Relating to Tractive Effort
Driver Diameter69"
Boiler Pressure285 psi
Cylinders (dia x stroke)20.5" x 32" (4)
Tractive Effort94428 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.30
Heating Ability
Firebox Area633 sq. ft
Grate Area108.20 sq. ft
Evaporative Heating Surface5389
Superheating Surface1681
Combined Heating Surface7070
Evaporative Heating Surface/Cylinder Volume220.42
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation30837
Same as above plus superheater percentage38168.97
Same as above but substitute firebox area for grate area223299.03
Power L131747.94
Power MT1033.09

Photos

Reference

Credits

Introduction and specifications provided by Steve Llanso of Sweat House Media.