Baltimore and Ohio class N-1
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. It was built by the B&O's own Mount Clare Shops in 1937 however it had problems with the sizes of the cylinders facing the other direction. In 1943 no . 5600 was retired from service. The locomotive was then Scrapped in 1950 .
B & O 5600 at the 1939 New York World's Fair
|B&O #5600 George H. Emerson|
Baltimore and Ohio Railroad #5600 George H. Emerson
- Reed, Brian (June 1972). Pennsylvania Duplexii. Loco Profile 24. Windsor, Berkshire: Profile Publications Limited. pp. 266–267.
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