Library of Congress
http://www.loc.gov/pictures/search/?q=Jack+Delano+railroad+Chicago&fa=displayed%3Aanywhere&sp=1&st=grid
Or... You may have stumbled onto Shorpy? Many of the photos on this site originate from the LOC files but are cleaned up, sorted and users can comment on them. There are several Delano Kodachromes here that are beautiful.
http://www.shorpy.com/jack-delano-photos
Hope this helps, Ed
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