Erie 2-6-6-4 Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class unknown (Locobase 11024)

Data from Robert LeMassena, "The First 4-8-4 and 2-6+6-4 (almost)", Railway & Locomotive Historical Society Newsletter, Vol 21, No 1 (Winter 2001 ). pp. 4-5.

As Baldwin turned out dozens of the Erie's new 2-8-4 design, which allowed a bigger firebox than the earlier 2-8-2s, it drafted a design for a locomotive that would take that idea even further. And the dimensions and areas of the proposal were simply enormous, later rivalled only by the largest of articulateds.

But the 2-6-6-4 (pace, Mr LeMassena) arrangement never would be popular, mostly because the single-axle leading truck was overmatched by the rest of a very large locomotive. Erie declined to proceed with a prototype and the first 2-6-6-4s would appear 5 years later on the Pittsburgh & West Virginia (Locobase 301).

Specifications by Steve Llanso of Sweat House Media
Locobase ID11024
RailroadErie (proposal)
Number in Class1
Road Numbers
Number Built
Valve GearBaker
Locomotive Length and Weight
Driver Wheelbase12.17'
Engine Wheelbase59.08'
Ratio of driving wheelbase to overall engine wheebase 0.21
Overall Wheelbase (engine & tender)116.69'
Axle Loading (Maximum Weight per Axle)72000 lbs
Weight on Drivers432000 lbs
Engine Weight610000 lbs
Tender Light Weight413000 lbs
Total Engine and Tender Weight1023000 lbs
Tender Water Capacity24000 gals
Tender Fuel Capacity (oil/coal)30 tons
Minimum weight of rail (calculated)120 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter70"
Boiler Pressure250 psi
Cylinders (dia x stroke)25" x 30"
Tractive Effort113839 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.79
Heating Ability
Firebox Area680 sq. ft
Grate Area126 sq. ft
Evaporative Heating Surface7100 sq. ft
Superheating Surface3000 sq. ft
Combined Heating Surface10100 sq. ft
Evaporative Heating Surface/Cylinder Volume208.28
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation31500
Same as above plus superheater percentage40950
Same as above but substitute firebox area for grate area221000
Power L132086
Power MT982.46

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