Invention and Engineering
The Baltimore and Ohio’s P-7 class is a class of 20 4-6-2 "Pacific" type locomotives built in 1927. Named for the first 20 Presidents of the United States, they were the prime motive power for the B&O’s top passenger trains for 31 years. One example, Baltimore and Ohio 5300, the "President Washington", has been preserved.
Lawrence Livermore National Laboratory.
Franco-Crosti boiler.
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