Great picture Mr. Downtown.
Captain, in this case, I think that the black color of the bridge really stands out against the background color of the sky and the buildings in a good way. Makes it seem more powerful and is a symbol of what made this city what it is - railroads and industry put Chicago on the map so to speak.
I am one of those that can see beauty in abandoned buildings. Usually I let my imagination wander and try to picture what it looked like when it was new, how it could be fixed up now and what kind of stories are hidden, known only to the walls and empty rooms, if they could only speak.