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|
|Railroad||Duluth, Missabe & Northern (DM&IR)|
|Number in Class||14|
|Locomotive Length and Weight|
|Ratio of driving wheelbase to overall engine wheebase||1|
|Overall Wheelbase (engine & tender)||66'|
|Axle Loading (Maximum Weight per Axle)|
|Weight on Drivers||352250 lbs|
|Engine Weight||352350 lbs|
|Tender Light Weight||186450 lbs|
|Total Engine and Tender Weight||538800 lbs|
|Tender Water Capacity||10000 gals|
|Tender Fuel Capacity (oil/coal)||14 tons|
|Minimum weight of rail (calculated)||117 lb/yard|
|Geometry Relating to Tractive Effort|
|Boiler Pressure||245 psi|
|Cylinders (dia x stroke)||28" x 30"|
|Tractive Effort||85931 lbs|
|Factor of Adhesion (Weight on Drivers/Tractive Effort)||4.10|
|Firebox Area||329.50 sq. ft|
|Grate Area||80 sq. ft|
|Evaporative Heating Surface||4175 sq. ft|
|Superheating Surface||1170 sq. ft|
|Combined Heating Surface||5345 sq. ft|
|Evaporative Heating Surface/Cylinder Volume||195.27|
|Computations Relating to Power Output (More Information)|
|Robert LeMassena's Power Computation||19600|
|Same as above plus superheater percentage||23912|
|Same as above but substitute firebox area for grate area||98488|