| 1 | RR | Consolidated Rail Corp. | added 10/1980; 1/1994; eliminated 7/1999 | NAKINA | |
| 2 | RR | Raritan River R.R. Co. | 7/1923-1/1980; eliminated 7/1980 | NAKINA | |
| 3 | RR | Raritan River R.R. Co. | 4/38-1/80; eliminated 7/80 | NRHS | |
| 4 | RR | Consolidated Rail Corp. | added 10/80; 1/94; eliminated 7/99 | NRHS | |
| 5 | RR | CONSOLIDATED RAIL CORP. [RARITAN RIVER RR] | PWRC | ||
| 6 | RR | Raritan River Railroad (Conrail) | RSRV | ||
| 7 | RR | Raritan River R.R. Co. | USA | TRAFFIC | |
| 8 | RR | Rautaruukki Oy | FI | VKM | |
| 9 | RRA | Royal Rwanda Airlines | ICAO1 | ||
| 10 | RRAA | R R TRUCKING LLC | SCAC4 | ||
| 11 | RRAC | ROCHA, R TRUCKING | SCAC4 | ||
| 12 | RRAE | R & R TRANSPORTATION | SCAC4 | ||
| 13 | RRAG | RUSSELL RIDGE TRANSPORT INC | SCAC4 | ||
| 14 | RRAH | RIO REBELS TRUCKING | SCAC4 | ||
| 15 | RRAJ | R & R TAKHAR TRANSPORTATION LTD | SCAC4 | ||
| 16 | RRAP | RAMIREZ RANCH | SCAC4 | ||
| 17 | RRAQ | R R & ASSOCIATES LLC | SCAC4 | ||
| 18 | RRAR | UMLER TEST ROAD NO.13 | PWRC | ||
| 19 | RRAR | RSR RACING LLC | SCAC4 | ||
| 20 | RRAV | R & R CLASSIC CARS | SCAC4 | ||
| 21 | RRAY | RICHARDSON, RAY TRUCKING | SCAC3 | ||
| 22 | RRB | RAMPART RANGE CORPORATION | PWRC | ||
| 23 | RRB | RRB Slovakia, s.r.o. | SK | VKM | |
| 24 | RRBA | ROJAS RUIZ, BALTAZAR | SCAC4 | ||
| 25 | RRBB | R & R BIG BUS | SCAC4 | ||
| 26 | RRBE | REEDEREI BLUE STAR GMBH | SCAC4 | ||
| 27 | RRBG | R & R BROKERAGE | SCAC3 | ||
| 28 | RRBH | ROSEAU RIVER BUFFALO RANCH | SCAC4 | ||
| 29 | RRBK | R & R BULK TRANSPORT INC | SCAC4 | ||
| 30 | RRBL | RED RIVER BARGE LINE, INC | SCAC3 | ||
| 31 | RRBN | RAPID ROBIN | SCAC3 | ||
| 32 | RRBS | ROADRUNNER BUS LINES | SCAC3 | ||
| 33 | RRBT | ROARK, ROBERT TRUCKING CO | SCAC3 | ||
| 34 | RRBT | ROARK, ROBERT TRUCKING CO | SCAC4 | ||
| 35 | RRBX | Rampart Range Corp. | added 4/1994; eliminated 7/1999; added 10/1999; 7/2000-7/2005; eliminated 1/2007 | NAKINA | |
| 36 | RRBX | Rampart Range Corp. | added 4/94; eliminated 7/99; added 10/99; 7/2000 | NRHS | |
| 37 | RRBX | RAMPART RANGE CORPORATION | PWRC | ||
| 38 | RRBX | Rampart Range Corporation | RSRV | ||
| 39 | RRBX | RAMPART RANGE CORPORATION | SCAC4 | ||
| 40 | RRC | Aero Roca | ICAO1 | ||
| 41 | RRC | REDMONT RAILWAY COMPANY | PWRC | ||
| 42 | RRC | Respondek Railroad Corporation | RSRV | ||
| 43 | RRC | REDMONT RAILWAY COMPANY INC | SCAC4 | ||
| 44 | RRC | Respondek Railroad Corporation | USA | TRAFFIC | |
| 45 | RRCB | RAWHIDE RODEO COMPANY | SCAC4 | ||
| 46 | RRCE | RACE RECYCLING AND COMPACTING EQUIP | SCAC4 | ||
| 47 | RRCF | ROUGH RIDER CRANE SERVICE | SCAC4 | ||
| 48 | RRCG | R AND R CARTAGE INC | SCAC3 | ||
| 49 | RRCH | R & R CHARTER | SCAC3 | ||
| 50 | RRCH | R & R OIL INC | SCAC4 | ||
| 51 | RRCI | Redmont Ry. Co., Inc. | 7/2000-7/2005 | NAKINA | |
| 52 | RRCI | Redmont Ry. Co., Inc. | Jul-00 | NRHS | |
| 53 | RRCI | REDMONT RAILWAY COMPANY | PWRC | ||
| 54 | RRCI | Redmont Railway | RSRV | ||
| 55 | RRCI | R & R CONTRACTING INC | SCAC4 | ||
| 56 | RRCK | RED ROCK ENTERPRISES LLC | SCAC4 | ||
| 57 | RRCL | R & R EXPEDITERS INC | SCAC3 | ||
| 58 | RRCM | RIVER REGION COOPERATIVE | SCAC4 | ||
| 59 | RRCN | R & R CONSTRUCTION CO INC | SCAC4 | ||
| 60 | RRCO | Rochelle R.R. Co. | 7/2000-7/2005 | NAKINA | |
| 61 | RRCO | Rochelle R.R. Co. | Jul-00 | NRHS | |
| 62 | RRCO | ROCHELLE RAILROAD COMPANY | PWRC | ||
| 63 | RRCO | Rochelle Railroad | RSRV | ||
| 64 | RRCO | ROCHELLE RAILROAD CO | SCAC4 | ||
| 65 | RRCP | REMI MARITIME CORPORATION | SCAC4 | ||
| 66 | RRCQ | RADAR RUNNERS CORP | SCAC4 | ||
| 67 | RRCS | RELIABLE RUNNERS COURIER SERVICE IN | SCAC4 | ||
| 68 | RRCT | RR CONSULTING | SCAC4 | ||
| 69 | RRCU | RAUTARUUKKI OY | SCAC3 | ||
| 70 | RRCU | REFTRADE RENTAL B V | SCAC4 | ||
| 71 | RRCV | RIVER CITY VAN LINE INC | SCAC3 | ||
| 72 | RRCX | Radar Railcar, Inc. | 1/1994-7/2005 (not listed) | NAKINA | |
| 73 | RRCX | Regent Refining (Canada) Ltd. (marks changed from TLCX) | added 4/1956; 10/1957; eliminated 10/1958 | NAKINA | |
| 74 | RRCX | Regent Refining (Canada) Ltd. | 10/57; eliminated 10/58 | NRHS | |
| 75 | RRCX | Radar Railcar, Inc. | 1/94-7/2000 | NRHS | |
| 76 | RRCX | *REGENT REFINING (CANADA) LTD. | PWRC | ||
| 77 | RRCX | +RADER RAILCAR, INC. | PWRC | ||
| 78 | RRCX | Radar Railcar | RSRV | ||
| 79 | RRCX | RADAR RAILCAR, INC. | SCAC4 | ||
| 80 | RRCY | RAPID RECOVERY TOWING LTD | SCAC4 | ||
| 81 | RRD | ADOLPH COORS COMPANY | PWRC | ||
| 82 | RRDC | RAILINC | SCAC3 | ||
| 83 | RRDC | RAILINC | SCAC4 | ||
| 84 | RRDD | R & R DISTRIBUTORS INC | SCAC4 | ||
| 85 | RRDE | ROADRUNNER DELIVERY SERVICE | SCAC3 | ||
| 86 | RRDF | REED, R D HEAVY TRANSPORT LLC | SCAC4 | ||
| 87 | RRDI | ROAD RUNNER DELIVERY INC | SCAC3 | ||
| 88 | RRDL | ROAD RUNNER DELIVERY SERVICE INC | SCAC3 | ||
| 89 | RRDM | RICHCO ROTTERDAM B V | SCAC3 | ||
| 90 | RRDN | R & R DISTRIBUTING CO INC | SCAC4 | ||
| 91 | RRDP | ROMAN ROAD EXPRESS | SCAC4 | ||
| 92 | RRDR | ROUGHRIDER TRANSPORT | SCAC3 | ||
| 93 | RRDS | RAPID RESPONSE DELIVERY INC | SCAC4 | ||
| 94 | RRDT | ROAD RIDER TRANSPORT LTD | SCAC3 | ||
| 95 | RRDV | R & R DELIVERY SERVICE INC | SCAC3 | ||
| 96 | RRDX | RAILROAD DEVELOPMENT CORPORATION | SCAC4 | ||
| 97 | RRDY | R & R DELIVERY SERVICE INC | SCAC3 | ||
| 98 | RRDY | R-R TRUCKING | SCAC4 | ||
| 99 | RRE | Aerotransportes Internacionales De Torreon | ICAO1 | ||
| 100 | RREB | RAPID RESPONSE INC | SCAC4 |