Delaware, Lackawanna &Western 4-8-0 "Mastodon" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 801 (Locobase 2986)

Data from the Catalogue Descriptive of Simple and Compound Locomotives built by Brooks Locomotive Works, Dunkirk, NY (Buffalo, NY: Matthew-Northrup Company, 1899). See also "Twelve-Wheel Freight Locomotive--Delaware, Lackawanna & Western Railway", Railway Master Mechanic, Volume XXIII, No 6 (November 1899), pp.347-350. Works numbers were 3304-3318 in September 1899. Dickson of Scranton, Pa built five more--works numbers 1092-1096--in 1900.

Brooks builder info from B.Rumary, 25 Kingscombe, Gurney Slade, Radstock, BA3 4TH, ENGLAND and Jeremy Lambert as supplied by Allen Stanley in March 2004.

This camelback featured a wide Wooten firebox (123"/3,124 mm long by 97"/2,464 mm wide) for burning fine anthracite coal. Identical to the CNJ's 829 class. Drury (1993) comments that "they were too powerful for their weight and were quite slippery."

Later modifications included reducing cylinder size and boiler pressure. The Brooks batch were all retired in 1923.

Specifications by Steve Llanso of Sweat House Media
Locobase ID2986
RailroadDelaware, Lackawanna &Western
Number in Class20
Road Numbers801-820
Number Built20
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase15'
Engine Wheelbase25.75'
Ratio of driving wheelbase to overall engine wheebase 0.58
Overall Wheelbase (engine & tender)50.37'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers166000 lbs
Engine Weight205000 lbs
Tender Light Weight112000 lbs
Total Engine and Tender Weight317000 lbs
Tender Water Capacity5000 gals
Tender Fuel Capacity (oil/coal)10 tons
Minimum weight of rail (calculated)69 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter54"
Boiler Pressure200 psi
Cylinders (dia x stroke)21" x 32"
Tractive Effort44427 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.74
Heating Ability
Firebox Area218 sq. ft
Grate Area82.40 sq. ft
Evaporative Heating Surface3168 sq. ft
Superheating Surface
Combined Heating Surface3168 sq. ft
Evaporative Heating Surface/Cylinder Volume246.96
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation16480
Same as above plus superheater percentage16480
Same as above but substitute firebox area for grate area43600
Power L15975
Power MT317.41



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