If you’re interested in listings of the various RPO routes through time you may want to look up “Mobile Post Office Society” as they have published a book on the subject and I think it may include sample cancellation stamps as well.
If anyone has an interest in historical RPO routes, there are details in the Annual Report of the Postmaster General at
https://catalog.hathitrust.org/Record/000518137. I haven’t searched the later issues but they were still being listed in 1900.
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