| 1 | RRC | Aero Roca, S.A. de C.V. | Callsign: Aeroroca, | MEX | AVCODES |
| 2 | RRC | Aero Roca | | | ICAO1 |
| 3 | RRC | REDMONT RAILWAY COMPANY | | | PWRC |
| 4 | RRC | Respondek Railroad Corporation | | | RSRV |
| 5 | RRC | REDMONT RAILWAY COMPANY INC | | | SCAC4 |
| 6 | RRC | Respondek Railroad Corporation | | USA | TRAFFIC |
| 7 | RRCB | RAWHIDE RODEO COMPANY | | | SCAC4 |
| 8 | RRCE | RACE RECYCLING AND COMPACTING EQUIP | | | SCAC4 |
| 9 | RRCF | ROUGH RIDER CRANE SERVICE | | | SCAC4 |
| 10 | RRCG | R AND R CARTAGE INC | | | SCAC3 |
| 11 | RRCH | R & R CHARTER | | | SCAC3 |
| 12 | RRCH | R & R OIL INC | | | SCAC4 |
| 13 | RRCI | Redmont Ry. Co., Inc. | 7/2000-7/2005 | | NAKINA |
| 14 | RRCI | Redmont Ry. Co., Inc. | Jul-00 | | NRHS |
| 15 | RRCI | REDMONT RAILWAY COMPANY | | | PWRC |
| 16 | RRCI | Redmont Railway | | | RSRV |
| 17 | RRCI | R & R CONTRACTING INC | | | SCAC4 |
| 18 | RRCK | RED ROCK ENTERPRISES LLC | | | SCAC4 |
| 19 | RRCL | R & R EXPEDITERS INC | | | SCAC3 |
| 20 | RRCM | RIVER REGION COOPERATIVE | | | SCAC4 |
| 21 | RRCN | R & R CONSTRUCTION CO INC | | | SCAC4 |
| 22 | RRCO | Rochelle R.R. Co. | 7/2000-7/2005 | | NAKINA |
| 23 | RRCO | Rochelle R.R. Co. | Jul-00 | | NRHS |
| 24 | RRCO | ROCHELLE RAILROAD COMPANY | | | PWRC |
| 25 | RRCO | Rochelle Railroad | | | RSRV |
| 26 | RRCO | ROCHELLE RAILROAD CO | | | SCAC4 |
| 27 | RRCP | REMI MARITIME CORPORATION | | | SCAC4 |
| 28 | RRCQ | RADAR RUNNERS CORP | | | SCAC4 |
| 29 | RRCS | RELIABLE RUNNERS COURIER SERVICE IN | | | SCAC4 |
| 30 | RRCT | RR CONSULTING | | | SCAC4 |
| 31 | RRCU | RAUTARUUKKI OY | | | SCAC3 |
| 32 | RRCU | REFTRADE RENTAL B V | | | SCAC4 |
| 33 | RRCV | RIVER CITY VAN LINE INC | | | SCAC3 |
| 34 | RRCX | Radar Railcar, Inc. | 1/1994-7/2005 (not listed) | | NAKINA |
| 35 | RRCX | Regent Refining (Canada) Ltd. (marks changed from TLCX) | added 4/1956; 10/1957; eliminated 10/1958 | | NAKINA |
| 36 | RRCX | Regent Refining (Canada) Ltd. | 10/57; eliminated 10/58 | | NRHS |
| 37 | RRCX | Radar Railcar, Inc. | 1/94-7/2000 | | NRHS |
| 38 | RRCX | *REGENT REFINING (CANADA) LTD. | | | PWRC |
| 39 | RRCX | +RADER RAILCAR, INC. | | | PWRC |
| 40 | RRCX | Radar Railcar | | | RSRV |
| 41 | RRCX | RADAR RAILCAR, INC. | | | SCAC4 |
| 42 | RRCY | RAPID RECOVERY TOWING LTD | | | SCAC4 |
