2-6-6

In the Whyte notation for describing steam locomotive wheel arrangement, a 2-6-6 is a locomotive with a two-wheeled leading truck, six driving wheels, and a six-wheeled trailing truck. All the locomotives produced of this arrangement have been tank locomotives, and the vast majority in the United States. It was a popular arrangement for the larger Mason Bogies, as well as some of the largest suburban tank locomotives.
==Equivalent classifications==
Other equivalent classifications are:
*UIC classification: 1C3 (also known as German classification and Italian classification)
*French classification: 133
*Turkish classification: 37
*Swiss classification: 3/7
Category:Wheel arrangements
Category:2-6-6 steam locomotives
Category:2-6-6T locomotives
Category:2-6-6 locomotives
Category:2-6-6T steam locomotives