Pere Marquette 2-8-4 "Berkshire" Type Locomotives

Class N-1 (Locobase 54)

Firebox had 122 sq ft of syphons and arch tubes. Consisting of three sub-classes, this set of Berkshires made their debut in 1937 when the first 15 N-1s arrived. In 1941, Lima produced 12 more (N-2) and followed with a final batch of 12 in 1944.

Specifications
ClassN-1
Locobase ID54
RailroadPere Marquette (PM)
Whyte2-8-4
Road Numbers1201-1239
GaugeStd
BuilderLima
Year1937
Valve Gear
Locomotive Length and Weight
Driver Wheelbase18.20'
Engine Wheelbase42'
Ratio of driving wheelbase to overall engine wheebase 0.43
Overall Wheelbase (engine & tender)88.23'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers277600 lbs
Engine Weight442500 lbs
Tender Light Weight284800 lbs
Total Engine and Tender Weight727300 lbs
Tender Water Capacity22000 gals
Tender Fuel Capacity (oil/coal)22 tons
Minimum weight per yard of rail on which locomotive could run115.67 lb rail
Geometry Relating to Tractive Effort
Driver Diameter69"
Boiler Pressure245 psi
Cylinders (dia x stroke)26" x 34"
Tractive Effort69368 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.00
Heating Ability
Firebox Area466 sq. ft
Grate Area90.30 sq. ft
Evaporative Heating Surface4777
Superheating Surface1932
Combined Heating Surface6709
Evaporative Heating Surface/Cylinder Volume228.64
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation22123.50
Same as above plus superheater percentage28494.43
Same as above but substitute firebox area for grate area147047.69
Power L133032.36
Power MT1049.33

Credits

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

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