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Definition of the noun 2-6-6

What does 2-6-6 mean as a name of something?


  1. Under the Whyte notation system, a steam locomotive that has two leading wheels, six coupled driving wheels, and six trailing wheels.


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.

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