I realize that I was not clear with my comment. My point is that we cannot resolve this issue by simply deleting data. Former railroads, or for former (historic) streets (as in Roman Street) or former important road routes (like historic Route 66) could best be handled by relations. To take as an example a former railroad route: The relation would comprise of modern streets, agricultural tracks, paths, embankments (even without any path) plus, possibly, buildings (which today in most cases are used in a completely different way or are in ruins)
The tagging that is most used (I think) is route=historic historic=railway example: relation 3183397 (my own attempts are not tagged like this - I m going to change them to this style)
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