What you likely are referring to is a copy of the B&O "Centennial March", which has a picture of a P7 Pacific locomotive, the "George Washington" on the cover.
Copies of this piece of music, and the 78-rpm record of the same music as recorded by the B&O Glee Club appear from time to time on ebay and elsewhere. Both are regarded as collectibles, though neither have a significant value because they are fairly common.
Wade Rice
Member, B&O RR Historical Society
http://www.borhs.org
Daniel Willard (1860-1942) and Jervis Langdon, Jr. (1905-2004) - Two of B&O's best presidents and managers!
President Leonor Loree (1858-1940) brought the B&O into the 20th century!