These were dual service locomotives having 24.5 x 32 cylinders, 75" drivers, a boiler pressure of 285 psi, weighed 470,000 pounds and had a tractive effort of 62,040 pounds.
They were assigned to freight service but, were used regularly on the New York to Montreal passenger trains. There are no survivors.
Firebox heating surface included 55 sq ft (5.1 sq m) of arch tubes. Prominent "elephant-ear" smoke lifters flanked the smokebox.
Fifteen engines delivered to the railroad in 1943 that served until 1952-1953.
These were relatively small "Northerns" that made very efficient use of firebox heating surface, which included a 7-ft-long (2,134 mm) combustion chamber, and superheater area. The boiler maintained a traditional ratio of tubes to flues and, in fact, resembled closely installations in several other 4-8-4 batches delivered during World War II. These included the Milwaukee Road S-3 (Locobase 249), Rock Island R-67 (Locobase 251), and the Union Pacific's FEF-3 (Locobase 8340).
All four driving axles turned in SKF roller bearings.
Like most late North American steam, these engines served for only a short time. All were replaced by diesels in 1952-1953.
|Specifications by Steve Llanso of Sweat House Media|
|Railroad||Delaware & Hudson|
|Number in Class||15|
|Locomotive Length and Weight|
|Driver Wheelbase (ft / m)||19.75 / 6.02|
|Engine Wheelbase (ft / m)||47.08 / 14.35|
|Ratio of driving wheelbase to overall engine wheebase||0.42|
|Overall Wheelbase (engine & tender) (ft / m)||91.58 / 27.91|
|Axle Loading (Maximum Weight per Axle) (lbs / kg)|
|Weight on Drivers (lbs / kg)||270,000 / 122,470|
|Engine Weight (lbs / kg)||470,000 / 213,189|
|Tender Loaded Weight (lbs / kg)||298,000 / 131,224|
|Total Engine and Tender Weight (lbs / kg)||768,000 / 344,413|
|Tender Water Capacity (gals / ML)||20,000 / 75.76|
|Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)||25 / 22.70|
|Minimum weight of rail (calculated) (lb/yd / kg/m)||113 / 56.50|
|Geometry Relating to Tractive Effort|
|Driver Diameter (in / mm)||75 / 1905|
|Boiler Pressure (psi / kPa)||285 / 20|
|High Pressure Cylinders (dia x stroke) (in / mm)||24.5" x 32" / 622x813|
|Tractive Effort (lbs / kg)||62,042 / 28141.81|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.35|
|Firebox Area (sq ft / m2)||482 / 44.80|
|Grate Area (sq ft / m2)||96.20 / 8.94|
|Evaporative Heating Surface (sq ft / m2)||4477 / 416.08|
|Superheating Surface (sq ft / m2)||1473 / 136.90|
|Combined Heating Surface (sq ft / m2)||5950 / 552.98|
|Evaporative Heating Surface/Cylinder Volume||256.41|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||27,417|
|Same as above plus superheater percentage||34,271|
|Same as above but substitute firebox area for grate area||171,713|