Daily AncestorR.R.
R.R. stands for railroad or railway, and the 1900 census allowed it in the occupation column, as in Brakeman, R.R.
R.R. is on the 1900 census list of approved occupation abbreviations, standing for railroad or railway. It usually follows the job: Fireman, R.R. or Laborer, R.R.
Railroad jobs were often listed this way, so expect lines like Section hand, R.R. In an address, though, R.R. or RR usually means rural route, a rural mail route like R.F.D. Check whether it sits in the occupation column or the address.
As seen in a recordOccupation column of the 1900 census
Brakeman, R.R.
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Daily Ancestor. "R.R.." Dictionary of Old Record Words. https://dailyancestor.com/dictionary/abbreviations/rr. Last checked 2026-10-10.