Last modified: 2009-03-17 18:16:16 UTC
http://commons.wikimedia.org/wiki/File:CIMG2192.JPG for example: It is a "deleted" file redirect, but it still appears to be a redirect when you visit the page. However, it doesn't actually redirect you to the target. If you undelete it, the redirect works again. It appears that deleting file redirects is impossible.
Fixed in r48492