2-6-6-2

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A preserved 2-6-6-2ST (Saddle Tank) locomotive.
Narrow gauge 2-6-6-2 locomotive.

In Whyte notation, 2-6-6-2 refers to a railroad steam locomotive that has two leading wheels followed by six coupled driving wheels, a second set of six coupled driving wheels, and two trailing wheels. This type of locomotive was commonly used in North America on logging railways.

The equivalent UIC classification is (1'C)C1'.

The 2-6-6-2 wheel arrangement also appeared in Soviet Russia as a standard gauge (5 foot gauge) locomotive built by Kolomna works. The P34 was a modern but compact Mallet. Only one was built, the next Mallet from the Kolomna works was a much larger machine the P38 2-8-8-4.

See also