Duluth, Mississippi River, & Northern 4-6-0 "Ten-wheeler" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 9 (Locobase 1226)

Data from an Catalogue Descriptive of Simple and Compound Locomotives built by Brooks Locomotive Works, Dunkirk, NY (Buffalo, NY: Matthew-Northrup Company, 1899). Works number was 2968 in June 1898..

The DMR&N was probably the immediate predecessor of the Duluth, Missabe, and Northern, which was in turn absorbed by the Duluth & Iron Range to become, in 1901, the Duluth, Missabe, and Iron Range (DM&IR). This low-drivered engine probably operated in dual service hauling both the few passenger trains as well as light freight duties. As with many other Brooks engines, this design used the squared-up Belpaire firebox.

It didn't last long on the DMR&N, being sold to the Great Northern as their 991 in 1902. The GN quickly sold 991 to the Isaac Joseph Iron Co. on 28 November 1902. sometime after that this lone engine to the St. Louis, Memphis & Southeastern as its 698. The StLM&SE merged with the Frisco (St. Louis - San Francisco) in 1904, which renumbered the engine 2698.

From that point, the 2698 had a relatively stable career right up to its retirement and scrapping in 1927.

Specifications by Steve Llanso of Sweat House Media
Locobase ID1226
RailroadDuluth, Mississippi River, & Northern
Number in Class1
Road Numbers9
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase14'
Engine Wheelbase24.33'
Ratio of driving wheelbase to overall engine wheebase 0.58
Overall Wheelbase (engine & tender)54.10'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers97800 lbs
Engine Weight127800 lbs
Tender Light Weight85000 lbs
Total Engine and Tender Weight212800 lbs
Tender Water Capacity4000 gals
Tender Fuel Capacity (oil/coal)8.5 tons
Minimum weight of rail (calculated)54 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter63"
Boiler Pressure180 psi
Cylinders (dia x stroke)18" x 24"
Tractive Effort18885 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.18
Heating Ability
Firebox Area119 sq. ft
Grate Area20.92 sq. ft
Evaporative Heating Surface1681 sq. ft
Superheating Surface
Combined Heating Surface1681 sq. ft
Evaporative Heating Surface/Cylinder Volume237.81
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3766
Same as above plus superheater percentage3766
Same as above but substitute firebox area for grate area21420
Power L16086
Power MT411.57

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