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


Class Details by Steve Llanso of Sweat House Media

Class F1 (Locobase 12940)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 28, p. 265. See also DM&N 4 - 1908 Locomotive Diagrams supplied in May 2005 from his extensive collection. (Thanks to Chris Hohl for his 18 February 2015 email giving the tender's coal capacity.) Works numbers were 27719, 27727 in March 1906.

Among the myriad drag freighters and mammoth coal haulers, this pair of high-wheeled (relatively speaking) passenger engines toiled for about 30 years. The diagram showed the calculated tractive effort at various speeds:

Speed 8 25 45 60

TE (lb) 24,780 17,600 9,860 7,880


Class F2/F3 (Locobase 12941)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 30, p. 195 and Volume 35, p. 163. See also DM&N 4 - 1908 Locomotive Diagrams supplied in May 2005 from his extensive collection. (Thanks to Chris Hohl for his 18 February 2015 email giving the tender's coal capacity.) Works numbers were 30436-30437 in March 1907 and 34723 in May 1910.

Passengers on the DM & IR travelled behind Ten-wheelers and Pacifics with moderately scaled drivers. The 1907 pair essentially repeated the 1906 locomotives shown in Locobase 12940, but had fewer tubes and smaller drivers. The 1910 engine, although placed in its own F3 class, had identical dimensions.

The diagram showed the calculated tractive effort at various speeds:

Speed 8 25 45 60

TE (lb) 26,500 17,800 10,080 8,200

All served into the middle 1930s.

Specifications by Steve Llanso of Sweat House Media
ClassF1F2/F3
Locobase ID12940 12941
RailroadDuluth, Missabe & Northern (DM&IR)Duluth, Missabe & Northern (DM&IR)
CountryUSAUSA
Whyte4-6-04-6-0
Number in Class23
Road Numbers100-101102-104
GaugeStdStd
Number Built23
BuilderBurnham, Williams & CoBurnham, Williams & Co
Year19061906
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase14'14'
Engine Wheelbase25.08'25.08'
Ratio of driving wheelbase to overall engine wheebase 0.56 0.56
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers118600 lbs120300 lbs
Engine Weight166200 lbs164000 lbs
Tender Light Weight129200 lbs120000 lbs
Total Engine and Tender Weight295400 lbs284000 lbs
Tender Water Capacity6000 gals6000 gals
Tender Fuel Capacity (oil/coal)10 tons10 tons
Minimum weight of rail (calculated)66 lb/yard67 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter67"63"
Boiler Pressure200 psi200 psi
Cylinders (dia x stroke)20" x 26"20" x 26"
Tractive Effort26388 lbs28063 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.49 4.29
Heating Ability
Firebox Area139.50 sq. ft135 sq. ft
Grate Area42.50 sq. ft42.80 sq. ft
Evaporative Heating Surface2512 sq. ft2402 sq. ft
Superheating Surface
Combined Heating Surface2512 sq. ft2402 sq. ft
Evaporative Heating Surface/Cylinder Volume265.71254.08
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation85008560
Same as above plus superheater percentage85008560
Same as above but substitute firebox area for grate area2790027000
Power L175826835
Power MT422.82375.78

Reference


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