page_title: 4-6-4
section_title: North American production list
hierarchical_section_title: 4-6-4 / North American production list
caption_attribution_description: English: C&amp;O No. 490 "Hudson" Steam Locomotive
context_page_description: 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.
context_section_description: Altogether 21 railroads in North America owned 4-6-4s. Many were similar in concept to the NYC Hudsons, with 79 to 80 inches (2,007 to 2,032 millimetres) driving wheels, but most were a little larger than the NYC locomotives, such as the F6 and F6a classes of the Milwaukee Road, the K-5-a class of the Canadian National, the Canadian Pacific locomotives, the S-4 class of the Burlington Route, the I-5 class of the New Haven and the 1151 class of the Lackawanna. There were also the lightweights, which include the L-1 class of the Nickel Plate Road, the class D of the Maine Central and the class NR-1 of the Ferrocarriles Nacionales de México (N de M). On these, the extra axle was used to reduce the axle load in comparison to a 4-6-2 Pacific locomotive.
  Because the 4-6-4 design was really only optimally suited to express passenger trains, which were dieselised early, the Hudsons were early candidates for withdrawal and scrapping. None of the NYC locomotives survived and neither did any of the Milwaukee locomotives. Five Canadian Pacific Hudsons survive, including four Royal Hudsons and the un-streamlined Canadian Pacific 2816. Five of the Burlington Route locomotives survive, including the Aeolus. Other surviving Hudson locomotives are two each of the Santa Fe and Canadian National, and single examples from the Chesapeake and Ohio Railway, N de M and Nickel Plate Road. The Pennsylvania Railroad also owned the P5 class of electric locomotives, also with a 4-6-4 wheel arrangement.
caption: Chesapeake & Ohio No. 490 Hudson Steam Locomotive at the Baltimore & Ohio Railroad Museum in Baltimore, Maryland. The locomotive was built as a 4-6-2 Pacific in 1926 and modified to this configuration in 1946.
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