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 ID11,024
RailroadErie (proposal)
Number in Class1
Road Numbers
Number Built
Valve GearBaker
Locomotive Length and Weight
Driver Wheelbase (ft)12.17
Engine Wheelbase (ft)59.08
Ratio of driving wheelbase to overall engine wheebase 0.21
Overall Wheelbase (engine & tender) (ft)116.69
Axle Loading (Maximum Weight per Axle) (lbs)72,000
Weight on Drivers (lbs)432,000
Engine Weight (lbs)610,000
Tender Loaded Weight (lbs)413,000
Total Engine and Tender Weight (lbs)1,023,000
Tender Water Capacity (gals)24,000
Tender Fuel Capacity (oil/coal) (gals/tons)30
Minimum weight of rail (calculated) (lb/yd)120
Geometry Relating to Tractive Effort
Driver Diameter (in)70
Boiler Pressure (psi)250
High Pressure Cylinders (dia x stroke) (in)25" x 30" (4)
Tractive Effort (lbs)113,839
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.79
Heating Ability
Firebox Area (sq ft)680
Grate Area (sq ft)126
Evaporative Heating Surface (sq ft)7100
Superheating Surface (sq ft)3000
Combined Heating Surface (sq ft)10,100
Evaporative Heating Surface/Cylinder Volume208.28
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation31,500
Same as above plus superheater percentage40,950
Same as above but substitute firebox area for grate area221,000
Power L132,086
Power MT982.46

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