English: The Baltimore and Ohio Railroad (B&O) was commemorated on its 125th anniversary with a 3-cent stamp issued on February 28, 1952. The background of the design depicts its 1827 charter by the Maryland legislature. The foreground shows a pioneer car, the "Tom Thumb" (the first American built steam locomotive), and a 'modern' diesel locomotive of the type common in 1952.
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Arago: people, postage & the post, National Postal Museum online