Duluth, Missabe & Northern 0-10-0 Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class S-6 (Locobase 12635)

Data from DeGolyer, Vol 77, pp. 766+. See also DM&IR 1 1951 Locomotive Diagram book supplied in May 2005 by Allen Stanley. (NB: For a detailed view of the component manufacturers that might be called on to supply a locomotive's needs in 1927, see pp. 768 of the specifications.) Works numbers were 60213 in September 1927, 60263 in November, and 60293-60294 in December.

Making up loaded iron-ore cars called for motive power as big as the enormous articulateds that hauled them to the ports. Baldwin delivered these biggest-in-class, all-adhesion switchers with tender boosters to add to their already sizable tractive effort. The firebox's heating surface area included its two thermic syphons (80 sq ft/7.4 sq m) and four arch tubes (28 sq ft/2.6 sq m).

Piston valves measured 14" (356 mm) in diameter and the specifications stated that the Baker valve motion was to be arranged for "long travel valves" and be able to be set for a maximum of 65% cut-off.

Before the DM & N was rolled into the Duluth, Missabe & Iron Range in 1930, the boosters were removed.

The "Ore Sorter" quartet served the DM & IR until the end of steam in the mid-1950s.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID12,635
RailroadDuluth, Missabe & Northern (DM&IR)
Number in Class14
Road Numbers90-93
Number Built14
Valve GearBaker
Locomotive Length and Weight
Driver Wheelbase (ft / m)20.83 / 6.35
Engine Wheelbase (ft / m)20.83 / 6.35
Ratio of driving wheelbase to overall engine wheebase1
Overall Wheelbase (engine & tender) (ft / m)66 / 20.12
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)352,250 / 159,778
Engine Weight (lbs / kg)352,350 / 159,823
Tender Loaded Weight (lbs / kg)186,450 / 84,572
Total Engine and Tender Weight (lbs / kg)538,800 / 244,395
Tender Water Capacity (gals / ML)10,000 / 37.88
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)14 / 12.70
Minimum weight of rail (calculated) (lb/yd / kg/m)117 / 58.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)57 / 1448
Boiler Pressure (psi / kPa)245 / 16.90
High Pressure Cylinders (dia x stroke) (in / mm)28" x 30" / 711x762
Tractive Effort (lbs / kg)85,931 / 38977.69
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.10
Heating Ability
Firebox Area (sq ft / m2)329.50 / 30.61
Grate Area (sq ft / m2)80 / 7.43
Evaporative Heating Surface (sq ft / m2)4175 / 387.87
Superheating Surface (sq ft / m2)1170 / 108.70
Combined Heating Surface (sq ft / m2)5345 / 496.57
Evaporative Heating Surface/Cylinder Volume195.27
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation19,600
Same as above plus superheater percentage23,912
Same as above but substitute firebox area for grate area98,488
Power L117,802
Power MT557.09

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