Milwaukee Road 2-6-6-2 Type Locomotives

Class N3-s (Locobase 298)

Data from tables in 1930 Locomotive Cyclopedia.

Firebox had combustion chamber and 105.5 sq ft of thermic syphons, boiler had feedwater heater. All cylinders were HP; engine was oil-fired.

A middle-era articulated with simple expansion all around, but low drivers, small grate area, and relatively small superheat area. Jim Scribbins (in Drury, 1993) notes that these engines had the highest tractive effort of any Milwaukee Road (by then the Chicago, Milwaukee, St. Paul, & Pacific) class.

Specifications
ClassN3-s
Locobase ID298
RailroadMilwaukee Road
Whyte2-6-6-2
Road Numbers9300-9316
GaugeStd
BuilderMilwaukee Road
Year1929
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase10'
Engine Wheelbase48.25'
Ratio of driving wheelbase to overall engine wheebase 0.21
Overall Wheelbase (engine & tender)80.23'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers323800 lbs
Engine Weight390300 lbs
Tender Light Weight349300 lbs
Total Engine and Tender Weight739600 lbs
Tender Water Capacity18000 gals
Tender Fuel Capacity (oil/coal)7300 gals
Minimum weight per yard of rail on which locomotive could run89.94 lb rail
Geometry Relating to Tractive Effort
Driver Diameter57"
Boiler Pressure200 psi
Cylinders (dia x stroke)21.5" x 30" (4)
Tractive Effort82718 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.91
Heating Ability
Firebox Area451.50 sq. ft
Grate Area72 sq. ft
Evaporative Heating Surface4849
Superheating Surface1193
Combined Heating Surface6042
Evaporative Heating Surface/Cylinder Volume192.33
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation14400
Same as above plus superheater percentage17243.30
Same as above but substitute firebox area for grate area108129.84
Power L113447.12
Power MT549.34

Credits

Introduction and specifications provided by Steve Llanso of Sweat House Media.

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