| 5401 | RLCX | RELCO LOCOMOTIVES INC | | | SCAC4 |
| 5402 | RLCX | Relco Locomotives Inc. | Real: RLEX | USA | TRAFFIC |
| 5403 | RLCY | ROE OIL COMPANY INC | | | SCAC4 |
| 5404 | RLCZ | ROPER LUMBER CO. | | | PWRC |
| 5405 | RLD | RAS Fluggeselischaft mbH | IATA: RW, Callsign: Rheinland, IATA Prefix: 586, Ceased operations on 11 January 2002. | D | AVCODES |
| 5406 | RLD | Rheinland Air Service | IATA: RW, IATA Prefix: 586, | D | AVCODES |
| 5407 | RLDB | RALEY, DELBERT TRUCKING | | | SCAC3 |
| 5408 | RLDC | ROLLINS DEDICATED CARRIAGE SERVICES | | | SCAC3 |
| 5409 | RLDC | RANGELAND COOPERATIVES INC | | | SCAC4 |
| 5410 | RLDE | R & L DRAY CO INC | | | SCAC4 |
| 5411 | RLDF | ROMELI LOGISTICS INC | | | SCAC4 |
| 5412 | RLDG | RED LINE DISTRIBUTION GUILD INC | | | SCAC3 |
| 5413 | RLDI | R & L DISTRIBUTORS | | | SCAC3 |
| 5414 | RLDI | RLD TRANSPORTATION INC | | | SCAC4 |
| 5415 | RLDK | ROLANDS TRUCKING | | | SCAC3 |
| 5416 | RLDM | REAL DESROCHES | | | SCAC4 |
| 5417 | RLDN | RICHLAND TRANSPORTATION (A DIV OF W | | | SCAC3 |
| 5418 | RLDN | RELIABLE DELIVERY SOLUTIONS | | | SCAC4 |
| 5419 | RLDO | ROWLAND TRANSPORTATION INC | | | SCAC3 |
| 5420 | RLDP | RAIL DIRECT TRANSPORTATION COMPANY | | | SCAC4 |
| 5421 | RLDQ | RELDA CARTAGE CO | | | SCAC3 |
| 5422 | RLDR | R & L DELIVERY SERVICE | | | SCAC3 |
| 5423 | RLDS | RELIABLE DELIVERY SERVICE | | | SCAC4 |
| 5424 | RLDT | ROLAND TRANSPORT INC | | | SCAC3 |
| 5425 | RLDT | ROLAND TRANSPORT INC | | | SCAC4 |
| 5426 | RLDU | RELOAD LOGISTICS DMCC | | ZA | BIC |
| 5427 | RLDV | RELIABLE DELIVERY | | | SCAC3 |
| 5428 | RLDX | R & L DEVELOPMENT CO. | | | PWRC |
| 5429 | RLDX | R & L DEVELOPMENT COMPANY | | | SCAC4 |
| 5430 | RLDY | R & L DELIVERY | | | SCAC3 |
| 5431 | RLE | Rico Linhas Aéreas | IATA: C7 | | ICAO1 |
| 5432 | RLEA | R & E INTERMODAL EXPRESS INC | | | SCAC3 |
| 5433 | RLEC | RED LION EXPRESS CO | | | SCAC3 |
| 5434 | RLED | ROBERTSON, LOUIS EDWARD | | | SCAC3 |
| 5435 | RLEH | RALEIGH TRUCKING SERVICE INC | | | SCAC3 |
| 5436 | RLEI | RELIANT LOGISTICS INC | | | SCAC4 |
| 5437 | RLEO | REGO'S LOWBED EQUIPMENT TRANSPORT | | | SCAC4 |
| 5438 | RLER | REX TRANSPORTATION COMPANY | | | SCAC4 |
| 5439 | RLES | RED LINE EXPRESS INC | | | SCAC3 |
| 5440 | RLET | RALEYS TOWING | | | SCAC3 |
| 5441 | RLET | READ LINE ENT LTD | | | SCAC4 |
| 5442 | RLEV | RICH-LEE VANS INC | | | SCAC3 |
| 5443 | RLEX | Republic Locomotives, Inc. | 7/2005 (not listed) | | NAKINA |
| 5444 | RLEX | Relco Locomotives, Inc. | 7/2000 (not listed) | | NAKINA |
| 5445 | RLEX | Republic Locomotives, Inc. | Jul-00 | | NRHS |
| 5446 | RLEX | REPUBLIC LOCOMOTIVES, INC. [RELCO LOCOMOTIVES, INC.] | | | PWRC |
| 5447 | RLEX | Relco Locomotives | | | RSRV |
| 5448 | RLEY | RILEY, DENNIS G | | | SCAC3 |
| 5449 | RLFD | RELIANCE FINANCE CO LTD | | | SCAC4 |
| 5450 | RLFE | RATCLIFFE & SONS | | | SCAC4 |
| 5451 | RLFF | ROLOFF TRUCKING | | | SCAC3 |
| 5452 | RLFG | RELIABLE FREIGHT SERVICES | | | SCAC3 |
| 5453 | RLFH | ROLLINS FURNERAL HOME INC | | | SCAC3 |
| 5454 | RLFI | RED LINE FREIGHT CARRIERS INC | | | SCAC4 |
| 5455 | RLFJ | RAMIREZ LINAREZ, FRANCISCO JAVIER | | | SCAC4 |
| 5456 | RLFL | ROL-LAND FARMS LTD | | | SCAC4 |
| 5457 | RLFM | RALSTON FARMS | | | SCAC4 |
| 5458 | RLFN | REMITALL FARMS INC | | | SCAC4 |
| 5459 | RLFQ | RUSH FREIGHT LINES INC | | | SCAC3 |
| 5460 | RLFR | RETAIL TRANSFER SERVICE INC | | | SCAC3 |
| 5461 | RLFT | RED LINE FREIGHT SYSTEMS | | | SCAC3 |
| 5462 | RLFT | REEEL FUEL TRANSPORTATION | | | SCAC4 |
| 5463 | RLFU | ROGERIO LEAL & FILHOS LDA | | | SCAC4 |
| 5464 | RLFV | R & L GLOBAL SERVICES | | | SCAC4 |
| 5465 | RLG | Regionalverkehr Ruhr-Lippe GmbH | Hamm | D | privat-bahn.de |
| 5466 | RLG | Regionalverkehr Ruhr-Lippe GmbH Soest u. Hochsauerland | | D | TRAFFIC |
| 5467 | RLG | Regionalverkehr Ruhr-Lippe | | DE | VKM |
| 5468 | RLGB | RILEPH GLOBAL TRANSPORT INC | | | SCAC4 |
| 5469 | RLGC | Railogic | | DE | VKM |
| 5470 | RLGG | RESCIGNO LOGISTICS GROUP LLC | | | SCAC4 |
| 5471 | RLGI | RESOURCE LOGISTICS INTERNATIONAL | | | SCAC4 |
| 5472 | RLGK | RADOM LOGIC GROUP INC | | | SCAC4 |
| 5473 | RLGM | RLG INTERMODAL COMPANY | | | SCAC4 |
| 5474 | RLGN | RaiLink Canada Ltd, d/b/a RaiLink Mackenzie Northern | added 7/1998; 7/2000; eliminated 10/2004; 7/2005 | | NAKINA |
| 5475 | RLGN | RaiLink Canada Ltd, d/b/a RaiLink Mackenzie Northern | added 7/98; 7/2000 | | NRHS |
| 5476 | RLGN | RAILINK CANADA LIMITED, DBA MACKENZIE NORTHERN RAILWAY | | | PWRC |
| 5477 | RLGN | Mackenzie Northern Railway | | | RSRV |
| 5478 | RLGO | ROLLING OATS LTD | | | SCAC3 |
| 5479 | RLGO | ROGERS LOGISTICS GROUP, THE | | | SCAC4 |
| 5480 | RLGP | RAMAR TRANSPORTATION & LOGISTICS GR | | | SCAC4 |
| 5481 | RLGQ | RDW LOGISTICS INC | | | SCAC4 |
| 5482 | RLGR | RILINGER TRUCKING | | | SCAC3 |
| 5483 | RLGS | REICH LOGISTIC SERVICES INC | | | SCAC4 |
| 5484 | RLGT | RAWLINGS TRUCKING INC | | | SCAC3 |
| 5485 | RLGU | REAL LOGISTICS SP. Z O.O. SP.K. | | PL | BIC |
| 5486 | RLGX | Roberto de la Garza y Hnos, S.A. | added 1/1956; 10/1957-1/1980 | | NAKINA |
| 5487 | RLGX | Roberto de la Garza y Hnos, S.A. | 10/57-1/80 | | NRHS |
| 5488 | RLGX | *ROBERTO DE LA GARZA Y HNOS, SA | | | PWRC |
| 5489 | RLGX | +RAIL LOGIX, LP | | | PWRC |
| 5490 | RLGX | Rail Logix | | | RSRV |
| 5491 | RLGX | RAIL LOGIX LP | | | SCAC4 |
| 5492 | RLGX | Rail Logix | | USA | TRAFFIC |
| 5493 | RLH | Ruili Airlines Co., Ltd. | IATA: DR, Callsign: Sendi, Name changed to Sunan Ruili Airlines Co., Ltd. On 18 October 2021. | PRC | AVCODES |
| 5494 | RLH | Sunan Ruili Airlines Co., Ltd. | IATA: DR, Callsign: Sendi, Name changed from Ruili Airlines Co., Ltd. On 18 October 2021. | PRC | AVCODES |
| 5495 | RLHD | R L & H DISTRIBUTING CO INC | | | SCAC3 |
| 5496 | RLHH | RaiLink Canada Ltd, d/b/a RaiLink Southern Ontario | added 7/1998; 7/2000; eliminated 1/2004; 7/2005 | | NAKINA |
| 5497 | RLHH | RaiLink Canada Ltd, d/b/a RaiLink Southern Ontario | added 7/98; 7/2000 | | NRHS |
| 5498 | RLHH | RAILINK CANADA LIMITED d/b/a RAILINK SOUTHERN ONTARIO | | | PWRC |
| 5499 | RLHH | Southern Ontario Railway (Genesee & Wyoming) | | | RSRV |
| 5500 | RLHI | RLH TRUCKING INC | | | SCAC4 |
