Under the Whyte notation for the classification of locomotives, 4-6-4 represents the wheel arrangement of four leading wheels, six powered and coupled driving wheels and four trailing wheels. In France where the type was first used, it is known as the Baltic while it became known as the Hudson in most of North America. [1]

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Nov 6, 2024 · This need led to the development of the 4-6-4 wheel arrangement, famously known as the "Hudson." Demonstrating remarkable success, the series quickly became a cornerstone of NYC's engine roster, with nearly 300 units serving the bustling line.

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In the Whyte notation for classifying steam locomotives by wheel arrangement, a 4-6-6-4 is a railroad steam locomotive that has four leading wheels followed by two sets of six coupled driving wheels and four trailing wheels. 4-6-6-4's are commonly known as Challengers.