Duluth, Missabe & Northern 0-10-0 Locomotives of 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.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12635
RailroadDuluth, Missabe & Northern (DM&IR)
Number in Class14
Road Numbers90-93
Number Built14
Valve GearBaker
Locomotive Length and Weight
Driver Wheelbase20.83'
Engine Wheelbase20.83'
Ratio of driving wheelbase to overall engine wheebase1
Overall Wheelbase (engine & tender)66'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers352250 lbs
Engine Weight352350 lbs
Tender Light Weight186450 lbs
Total Engine and Tender Weight538800 lbs
Tender Water Capacity10000 gals
Tender Fuel Capacity (oil/coal)14 tons
Minimum weight of rail (calculated)117 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter57"
Boiler Pressure245 psi
Cylinders (dia x stroke)28" x 30"
Tractive Effort85931 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.10
Heating Ability
Firebox Area329.50 sq. ft
Grate Area80 sq. ft
Evaporative Heating Surface4175 sq. ft
Superheating Surface1170 sq. ft
Combined Heating Surface5345 sq. ft
Evaporative Heating Surface/Cylinder Volume195.27
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation19600
Same as above plus superheater percentage23912
Same as above but substitute firebox area for grate area98488
Power L117802
Power MT557.09


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