page_title: 4-4-4-4
hierarchical_section_title: 4-4-4-4
caption_attribution_description: English: Baltimore and Ohio Railroad duplex locomotive, class N-1 #5600 George H. Emerson, at the 1939 New York World&#39;s Fair.
context_page_description: A 4-4-4-4 steam locomotive, in the Whyte notation for describing locomotive wheel arrangements, has a four-wheel leading truck, two sets of four driving wheels, and a four-wheel trailing truck. While it would be possible to make an articulated locomotive of this arrangement, the only 4-4-4-4s ever built were duplex locomotives—with two sets of cylinders driving two sets of driven wheels in one rigid frame, essentially a 4-8-4 with divided drive.
context_section_description: A 4-4-4-4 steam locomotive, in the Whyte notation for describing locomotive wheel arrangements, has a four-wheel leading truck, two sets of four driving wheels, and a four-wheel trailing truck. While it would be possible to make an articulated locomotive of this arrangement, the only 4-4-4-4s ever built were duplex locomotives—with two sets of cylinders driving two sets of driven wheels in one rigid frame, essentially a 4-8-4 with divided drive.
caption: The Baltimore & Ohio Railroad's #5600 George H. Emerson.
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