Spokane, Portland & Seattle 4-8-4 "Northern" Type Locomotives

Class E-1 (Locobase 1068)

Pulled from website about largest active locomotives. Said to have been identical to the Northern Pacific's A-3s except for the firebox, which on the SP&S engines burned Bunker C oil fuel. These endured until 1960 when they were retired. #700 came back as an excursion engine.

Specifications
ClassE-1
Locobase ID1068
RailroadSpokane, Portland & Seattle
Whyte4-8-4
Road Numbers700-702
GaugeStd
BuilderBaldwin
Year1938
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase20.66'
Engine Wheelbase48.58'
Ratio of driving wheelbase to overall engine wheebase 0.43
Overall Wheelbase (engine & tender)110.56'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers296500 lbs
Engine Weight485820 lbs
Tender Light Weight379700 lbs
Total Engine and Tender Weight865520 lbs
Tender Water Capacity20000 gals
Tender Fuel Capacity (oil/coal)8800 gals
Minimum weight per yard of rail on which locomotive could run123.54 lb rail
Geometry Relating to Tractive Effort
Driver Diameter77"
Boiler Pressure260 psi
Cylinders (dia x stroke)28" x 31"
Tractive Effort69756 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.25
Heating Ability
Firebox Area490 sq. ft
Grate Area115 sq. ft
Evaporative Heating Surface4703
Superheating Surface2095
Combined Heating Surface6798
Evaporative Heating Surface/Cylinder Volume212.87
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation29900
Same as above plus superheater percentage39114.55
Same as above but substitute firebox area for grate area166661.99
Power L139279.49
Power MT1168.25

Credits

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

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