| 1 | RRR | RAF-HQSTC (Air Transport) | Callsign: Ascot/Kittyhawk, | GB | AVCODES |
| 2 | RRR | Royal Air Force | | | ICAO1 |
| 3 | RRRA | REGION RAIL REORG ACT (1973) TARIFF | | | SCAC3 |
| 4 | RRRC | RAIL ROAD RUNNER CONTAINER | | | SCAC4 |
| 5 | RRRE | RRR RECYCLING SERVICES HAWAII | | | SCAC4 |
| 6 | RRRF | R & R REFRIGERATED TRANSPORT | | | SCAC3 |
| 7 | RRRG | REMORQUAGE REAL GRAND MAISON | | | SCAC4 |
| 8 | RRRI | R & R TRUCKING | | | SCAC4 |
| 9 | RRRK | R & R TRANSPORTATION INC | | | SCAC4 |
| 10 | RRRO | RAINBOW MOVERS INC | | | SCAC4 |
| 11 | RRRP | RRR TRANSPORTATION INC | | | SCAC3 |
| 12 | RRRP | RRR TRANSPORTATION INC | | | SCAC4 |
| 13 | RRRR | Rock & Rail, Inc. | 7/2000-7/2005 | | NAKINA |
| 14 | RRRR | Rock & Rail, Inc. | Jul-00 | | NRHS |
| 15 | RRRR | ROCK & RAIL INCORPORATED | | | PWRC |
| 16 | RRRR | Rock & Rail Inc. | | | RSRV |
| 17 | RRRR | ROCK & RAIL INC | | | SCAC4 |
| 18 | RRRR | Rock & Rail, Inc. | | USA | TRAFFIC |
| 19 | RRRS | ROCK REMOVAL RESOURCES TRANSPORT LL | | | SCAC4 |
| 20 | RRRT | RAVAGNIE, RAYMOND R TRUCKING | | | SCAC3 |
| 21 | RRRT | R R R LOGISTICS LLC | | | SCAC4 |
| 22 | RRRU | REBLOCK CONTAINER AS. | | N | BIC |
| 23 | RRRU | R-CONTAINER IMPORT AS | | | SCAC4 |
| 24 | RRRX | Rex Leasing, Inc. | added 1/1993; 1/1994-7/2005 | | NAKINA |
| 25 | RRRX | General Electric Railcar Services Corp. | added 10/1992; eliminated 1/1993 | | NAKINA |
| 26 | RRRX | Itel Rail Corp. | eliminated 10/1992 | | NAKINA |
| 27 | RRRX | Rex Leasing, Inc. (transferred to Itel Rail Corp.) | added 10/1988 | | NAKINA |
| 28 | RRRX | Rex Leasing, Inc. | added 7/1980; eliminated 1/1987; added 7/1987; eliminated 10/1988 | | NAKINA |
| 29 | RRRX | Red River Refining Co., Inc. | 8/1920-7/1923 | | NAKINA |
| 30 | RRRX | Rex Leasing, Inc. | added 7/80; eliminated 1/87; added 7/87; eliminated 10/88 | | NRHS |
| 31 | RRRX | Rex Leasing, Inc. (transferred to Itel Rail Corp.) | added 10/88 | | NRHS |
| 32 | RRRX | Itel Rail Corp. | eliminated 10/92 | | NRHS |
| 33 | RRRX | General Electric Railcar Services Corp. | added 10/92; eliminated 1/93 | | NRHS |
| 34 | RRRX | Rex Leasing, Inc. | added 1/93; 1/94-7/2000 | | NRHS |
| 35 | RRRX | *RED RIVER REFINING CO., INC. | | | PWRC |
| 36 | RRRX | +REX LEASING, INC. [GENERAL ELECTRIC RAILCAR SERVICES CORP.; ITEL RAIL CORP.] | | | PWRC |
| 37 | RRRX | Rex Leasing | | | RSRV |
| 38 | RRRX | REX LEASING, INC. | | | SCAC4 |