Firebox heating surface included 100 sq ft (9.3 sq m) of syphons (two in the firebox, one in the combustion chamber) and 27 sq ft (2.5 sq m) in arch tubes. 12" (305 mm) piston valves had 7 1/2" (191 mm) of travel. S. Kip Farrington's opinion (Railroading Coast to Coast, 1976): "One of the truly great 4-6-4 type built. A little higher steam pressure and tender capacity would have made them perfect." One of the class was temporarily renumbered 1939 to celebrate the 1939 New York World's Fair. Chris Hohl found that the same engine was renumbered again for the second year as 1940 and reshrouded in a new streamlining rig.
Drury (1993) notes their outsized power for the traffic on the road: "...fast, powerful engines designed to pull 16-18 cars at 80 mph -- but the speed limit on the route was 70 mph and the trains were rarely ever more than 8 to 10 cars."
According to Wikipedia:"The five locomotives only lasted ten years in their original intended assignments, since the Lackawanna dieselized its express passenger trains in 1947. The Hudsons were relegated to lesser assignments such as commuter trains, and began to be seen on the eastern end of the railroad. One assignment was the early morning Merchants Express (Train 26) from Scranton to Hoboken, New Jersey, returning in the late afternoon hauling the Scrantonian (Train 11). Another was the Interstate Express (Train 1301), received from the Reading Railroad/Jersey Central at Taylor Junction, near Scranton, and hauled to Binghamton, New York.
Even in this service, they did not last long. All five were withdrawn from service in 1951-53 and subsequently scrapped; none of the railroad's later steam locomotives survived the cutter's torch."
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Delaware, Lackawanna &Western|
|Number in Class||5|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||0.34|
|Overall Wheelbase (engine & tender)||81.21'|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||198000 lbs|
|Engine Weight||377000 lbs|
|Tender Light Weight||313100 lbs|
|Total Engine and Tender Weight||690100 lbs|
|Tender Water Capacity||15800 gals|
|Tender Fuel Capacity (oil/coal)||26 tons|
|Minimum weight of rail (calculated)||110 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||245 psi|
|Cylinders (dia x stroke)||26" x 30"|
|Tractive Effort||52791 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||3.75|
|Firebox Area||477 sq. ft|
|Grate Area||81.50 sq. ft|
|Evaporative Heating Surface||3854 sq. ft|
|Superheating Surface||1123 sq. ft|
|Combined Heating Surface||4977 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||209.06|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||19968|
|Same as above plus superheater percentage||24560|
|Same as above but substitute firebox area for grate area||143744|