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 ID12,940 12,941
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 Wheelbase (ft)1414
Engine Wheelbase (ft)25.0825.08
Ratio of driving wheelbase to overall engine wheebase 0.56 0.56
Overall Wheelbase (engine & tender) (ft)
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)118,600120,300
Engine Weight (lbs)166,200164,000
Tender Loaded Weight (lbs)129,200120,000
Total Engine and Tender Weight (lbs)295,400284,000
Tender Water Capacity (gals)60006000
Tender Fuel Capacity (oil/coal) (gals/tons)1010
Minimum weight of rail (calculated) (lb/yd)6667
Geometry Relating to Tractive Effort
Driver Diameter (in)6763
Boiler Pressure (psi)200200
High Pressure Cylinders (dia x stroke) (in)20" x 26"20" x 26"
Tractive Effort (lbs)26,38828,063
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.49 4.29
Heating Ability
Firebox Area (sq ft)139.50135
Grate Area (sq ft)42.5042.80
Evaporative Heating Surface (sq ft)25122402
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)25122402
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 area27,90027,000
Power L175826835
Power MT422.82375.78

Reference


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