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. The Whyte notation for classifying Steam locomotives by Wheel arrangement was devised by Frederick Methvan Whyte Other classification schemes like A steam locomotive is a Locomotive powered by Steam. The term usually refers to its use on Railways but can also refer to a "road locomotive" The leading wheel or leading axle of a Steam locomotive is an unpowered Wheel or Axle located in front of the driving wheels On a Steam locomotive, a driving wheel is a powered Wheel which is driven by the Locomotive 's Pistons (or Turbine, in the On a Steam locomotive, a trailing wheel or trailing axle is an unpowered Wheel or Axle located behind the driving wheels This type of locomotive was commonly used in North America on logging railways.

Other equivalent classifications are:
UIC classification: 1CC1 (also known as German classification and Italian classification)
French classification: 130+031
Turkish classification: 34+34
Swiss classification: 3/4+3/4

The UIC classification is refined to (1'C)C1' for Mallet locomotives. The UIC classification is a comprehensive system for describing the Wheel arrangement of Locomotives Multiple units and Trams It is The UIC classification is a comprehensive system for describing the Wheel arrangement of Locomotives Multiple units and Trams It is

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

• USRA 2-6-6-2
• Category:2-6-6-2 locomotives