David Shackelford is the chief curator of the B&O Railroad Museum, a Smithsonian Affiliate in Baltimore, Maryland. All the images used for this project were selected from the Hays ...view moreDavid Shackelford is the chief curator of the B&O Railroad Museum, a Smithsonian Affiliate in Baltimore, Maryland. All the images used for this project were selected from the Hays T. Watkins Research Library.view less