This beautiful old photograph shows Camden Station (which still stands next to Camden Yards) as it looked in 1872. Click on it for amazing details.
This is an albumen print from the book Photographic Views of the Baltimore and Ohio Rail Road, and Its Branches, From The Lakes to The Sea, which is illustrated with images of attractions found along the route of the Baltimore and Ohio Railroad between Baltimore and Chicago. Source: SMU Digital Libraries
Here’s another great one of Camden Station from a little after that.