Delaware, Lackawanna &Western 4-8-0 "Mastodon" Locomotives in 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.

Principal Dimensions 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 Wheelbase (ft / m)15 / 4.57
Engine Wheelbase (ft / m)25.75 / 7.85
Ratio of driving wheelbase to overall engine wheelbase 0.58
Overall Wheelbase (engine & tender) (ft / m)50.37 / 15.35
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)166,000 / 75,296
Engine Weight (lbs / kg)205,000 / 92,987
Tender Loaded Weight (lbs / kg)112,000 / 50,802
Total Engine and Tender Weight (lbs / kg)317,000 / 143,789
Tender Water Capacity (gals / ML)5000 / 18.94
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)10 / 9
Minimum weight of rail (calculated) (lb/yd / kg/m)69 / 34.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)54 / 1372
Boiler Pressure (psi / kPa)200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)21" x 32" / 533x813
Tractive Effort (lbs / kg)44,427 / 20151.77
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.74
Heating Ability
Tubes (number - dia) (in / mm)410 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)13.85 / 4.22
Firebox Area (sq ft / m2)218 / 20.26
Grate Area (sq ft / m2)82.40 / 7.66
Evaporative Heating Surface (sq ft / m2)3168 / 294.42
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)3168 / 294.42
Evaporative Heating Surface/Cylinder Volume246.92
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation16,480
Same as above plus superheater percentage16,480
Same as above but substitute firebox area for grate area43,600
Power L15974
Power MT317.36

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Wes Barris