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.
The Whyte notation is a classification method for locomotives based on wheel arrangement. While the Whyte notation is most commonly used when referring to steam locomotives, it can also be applied to
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. With only…
Whyte notation from a handbook for railroad industry workers published in 1906