Duluth, Mississippi River, & Northern 2-6-0 "Mogul" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 7 (Locobase 2612)

Data from Catalogue Descriptive of Simple and Compound Locomotives built by Brooks Locomotive Works, Dunkirk, NY (Buffalo, NY: Matthew-Northrup Company, 1899).

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

Works numbers were 2535 in July 1895) and 2967 in May 1898. Both were sold to the Eastern Railway of Minnesota in 1899, but may never have actually operated on that road.

Medium Moguls with widespread drivers, steam dome over middle driver set, inversely tapered stack. Specifications say wagon top boiler, but the illustration suggests a Belpaire boiler.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID2612
RailroadDuluth, Mississippi River, & Northern
Number in Class2
Road Numbers7-8
Number Built2
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)14 / 4.27
Engine Wheelbase (ft / m)21.50 / 6.55
Ratio of driving wheelbase to overall engine wheebase 0.65
Overall Wheelbase (engine & tender) (ft / m)48 / 14.63
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)96,000 / 43,545
Engine Weight (lbs / kg)110,500 / 50,122
Tender Loaded Weight (lbs / kg)74,000 / 33,566
Total Engine and Tender Weight (lbs / kg)184,500 / 83,688
Tender Water Capacity (gals / ML)3500 / 13.26
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)7 / 6.40
Minimum weight of rail (calculated) (lb/yd / kg/m)53 / 26.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)51 / 1295
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x610
Tractive Effort (lbs / kg)23,328 / 10581.42
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.12
Heating Ability
Firebox Area (sq ft / m2)133.50 / 12.41
Grate Area (sq ft / m2)22.20 / 2.06
Evaporative Heating Surface (sq ft / m2)1348 / 125.28
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1348 / 125.28
Evaporative Heating Surface/Cylinder Volume190.70
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3996
Same as above plus superheater percentage3996
Same as above but substitute firebox area for grate area24,030
Power L14363
Power MT300.59

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