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 Wheelbase (ft)14
Engine Wheelbase (ft)24.33
Ratio of driving wheelbase to overall engine wheebase 0.58
Overall Wheelbase (engine & tender) (ft)54.10
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)97,800
Engine Weight (lbs)127,800
Tender Loaded Weight (lbs)85,000
Total Engine and Tender Weight (lbs)212,800
Tender Water Capacity (gals)4000
Tender Fuel Capacity (oil/coal) (gals/tons) 8.50
Minimum weight of rail (calculated) (lb/yd)54
Geometry Relating to Tractive Effort
Driver Diameter (in)63
Boiler Pressure (psi)180
High Pressure Cylinders (dia x stroke) (in)18" x 24"
Tractive Effort (lbs)18,885
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.18
Heating Ability
Firebox Area (sq ft)119
Grate Area (sq ft)20.92
Evaporative Heating Surface (sq ft)1681
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)1681
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 area21,420
Power L16086
Power MT411.57