The USRA 2-6-6-2 is a standardized design of 2-6-6-2 Mallet locomotives developed by the United States Railroad Administration during World War I.

The USRA 2-6-6-2 locomotive is a Mallet, or compound articulated type, having both low-pressure and high-pressure cylinders.

The USRA 2-6-6-2 articulated locomotives were direct developments of the Chesapeake & Ohio class H2 and H4 series.

The independently pivoted front engine allowed it to negotiate branch lines and tight curves while hauling larger consists than its smaller cousins in the USRA series.

The Chesapeake & Ohio Railroad ordered the first of these compact 2-6-6-2 articulated steam locomotives from Alco in 1911.