Baltimore and Ohio Class N-1
Baltimore and Ohio Railroad #5600 George H. Emerson | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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The Baltimore and Ohio Railroad's sole Class N-1 steam locomotive, #5600 George H. Emerson, was the first duplex locomotive and the first 4-4-4-4 locomotive ever built. It was designed and built by the railroad's own shops in 1937. The rear set of cylinders were placed beside the firebox. This allowed the locomotive's wheelbase to remain the same. The space beside the firebox was hot and dirty, which caused premature cylinder wear, and the placement of the cylinders limited the size of the firebox. These same problems occurred on the PRR Q1, which also placed the rear cylinders by the firebox.
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B & O 5600 at the 1939 New York World's Fair
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Detail, showing the rearward cylinders and gear
References
- Reed, Brian (June 1972). Pennsylvania Duplexii. Loco Profile 24. Windsor, Berkshire: Profile Publications Limited. pp. 266–267.
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