2-6-4

Under the Whyte notation for the classification of steam locomotives, a '2-6-4' locomotive has two leading wheels, six coupled driving wheels and four trailing wheels in a trailing truck. The equivalent UIC classification is '1'C2''. The wheel arrangement is best known for the Austrian express locomotives class 210 of 1908 and class 310 of 1911, both designed by Karl Gölsdorf; it is sometimes known as the ''Adriatic'' arrangement, named for the Adriatic Sea which bordered Austria-Hungary until 1918.
It was much more common as a tank locomotive arrangement, '2-6-4T'. These were produced for many different railway systems worldwide.

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