PHOTOCOPY OF PRE-1948 PHOTOGRAPH OF LOCOMOTIVE CROSSING VIADUCT WITH RELAY HOUSE IN BACKGROUND. Photo identified as Chemy negative no. 4257. Courtesy of the Smithsonian Institution. - Baltimore and Ohio Railroad, Thomas Viaduct, Spanning Patapsco River, Elkridge, Howard County, MD; Latrobe, Benjamin; McCartney, John; Wever, Casper; Thomas, Phillip E

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Photo credit: © Tango Images / Alamy / Afripics
License: Licensed
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