2-6-6-6
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 Allegheny - Most Powerful Steam Locomotive, 1:54,Wanda Kaluza on YouTube |
The 2-6-6-6 (in Whyte notation) is an articulated locomotive type with 2 leading wheels, two sets of six driving wheels and six trailing wheels. Only two classes of the 2-6-6-6 type were built. One was the "Allegheny" class, built by the Lima Locomotive Works. The name comes from the locomotive's first service with the Chesapeake and Ohio Railway beginning in 1941. The other was the "Blue Ridge" class for the Virginian Railway. These were one of the most powerful reciprocating steam locomotives ever built at 7,500 HP (which was only exceeded by the PRR Q2), and one of the heaviest at 389 tons for the locomotive itself plus 215 tons for the loaded tender.
Other equivalent classifications are:
UIC classification: 1CC3 (also known as German classification and Italian classification)
French classification: 130+033
Turkish classification: 34+36
Swiss classification: 3/4+3/6
The UIC classification is refined to (1'C)C3' for Mallet locomotives.
Two classes of 2-6-6-6 locomotives were built; the sixty H-8 "Allegheny" class locomotives for the Chesapeake and Ohio Railway (C&O) between 1941 and 1948, and the eight AG "Blue Ridge" class locomotives for the Virginian Railway in 1945. (The locomotives were Series AG on the Virginian, which was thought to be an abbreviation for Allegheny, but that referred to their being Articulated, Series G.) All were built by the Lima Locomotive Works. The "Allegheny" name refers to the C&O locomotives' job of hauling coal trains over the Allegheny Mountains.
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Wikipedia