Design
The USRA 2-6-6-2 locomotive was a Mallet, or compound articulated type, having both low-pressure and high-pressure cylinders. The smaller high-pressure cylinders powered the rear set of driving wheels, and the larger low-pressure cylinders powered the forward set of driving wheels. The USRA 2-6-6-2 articulated locomotives were direct developments of the Chesapeake & Ohio class H2 and H4 series.
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