| 7401 | RRRX | Itel Rail Corp. | eliminated 10/92 | NRHS | |
| 7402 | RRRX | General Electric Railcar Services Corp. | added 10/92; eliminated 1/93 | NRHS | |
| 7403 | RRRX | Rex Leasing, Inc. | added 1/93; 1/94-7/2000 | NRHS | |
| 7404 | RRRX | *RED RIVER REFINING CO., INC. | PWRC | ||
| 7405 | RRRX | +REX LEASING, INC. [GENERAL ELECTRIC RAILCAR SERVICES CORP.; ITEL RAIL CORP.] | PWRC | ||
| 7406 | RRRX | Rex Leasing | RSRV | ||
| 7407 | RRRX | REX LEASING, INC. | SCAC4 | ||
| 7408 | RRS | Boscombe Down DERA (Formation) | ICAO1 | ||
| 7409 | RRS | RIMROCK STAGES | SCAC4 | ||
| 7410 | RRSA | RED RIVER SPRAY-ON LTD | SCAC4 | ||
| 7411 | RRSB | ROCKY RIDGE STABLES | SCAC4 | ||
| 7412 | RRSI | RED RIVER SUPPLY INC | SCAC4 | ||
| 7413 | RRSK | ROADRUNNER 66 TRUCKING INC | SCAC4 | ||
| 7414 | RRSK | Regio Rail, s.r.o. | SK | VKM | |
| 7415 | RRSL | RAJA ROADRAIL SERVICES LTD | SCAC4 | ||
| 7416 | RRSO | RECYCLING RESOURCES | SCAC3 | ||
| 7417 | RRSQ | REX, ROGER & SON TRUCKING INC | SCAC4 | ||
| 7418 | RRSR | RRR EXPRESS | SCAC4 | ||
| 7419 | RRSS | REED, R S & SONS INC | SCAC3 | ||
| 7420 | RRST | RRS TRANSPORT INC | SCAC3 | ||
| 7421 | RRST | RND RUSTICS | SCAC4 | ||
| 7422 | RRSU | ARCTIC REEFER SERVICE & REPAIR B V | SCAC4 | ||
| 7423 | RRSW | ROAD RUNNER SPECIALTY TOWING & TRAN | SCAC4 | ||
| 7424 | RRT | Transportes Aereos Sierra | ICAO1 | ||
| 7425 | RRTA | R & R TRANSPORTATION | SCAC3 | ||
| 7426 | RRTA | ROAD RUNNER TRAILER MANUFACTURING L | SCAC4 | ||
| 7427 | RRTB | R & R TRUCKING | SCAC3 | ||
| 7428 | RRTC | RED RIVER TRUCKING COMPANY | SCAC3 | ||
| 7429 | RRTD | R & R TRUCKING | SCAC3 | ||
| 7430 | RRTE | R & R TRUCKING (HUMBERSTONE) LIMITE | SCAC3 | ||
| 7431 | RRTE | R & R TRANSPORTATION | SCAC4 | ||
| 7432 | RRTG | REEDER, ROBERT TRUCKING | SCAC3 | ||
| 7433 | RRTH | R & R TRUCKING | SCAC3 | ||
| 7434 | RRTH | REDRICK TECHNOLOGIES INC | SCAC4 | ||
| 7435 | RRTI | R & R TRUCKING INC | SCAC3 | ||
| 7436 | RRTI | R & R TRANSPORT INC | SCAC4 | ||
| 7437 | RRTJ | RRT LOGISTICS INC | SCAC4 | ||
| 7438 | RRTL | ROLLAND ROSE TRUCKING INC | SCAC4 | ||
| 7439 | RRTM | R & R TRUCKING INC | SCAC3 | ||
| 7440 | RRTN | RED RIVER TRANSPORTATION | SCAC3 | ||
| 7441 | RRTO | RODRIGUEZ TRANSPORT | SCAC4 | ||
| 7442 | RRTP | ROAD-RAIL TRANSPORTATION COMPANY | SCAC3 | ||
| 7443 | RRTQ | ROADRUNNER TRUCKING, INC | SCAC3 | ||
| 7444 | RRTQ | R & R TRUCKING | SCAC4 | ||
| 7445 | RRTS | R & R TRUCKING SERVICE | SCAC3 | ||
| 7446 | RRTT | R & R TRANSPORTATION COMPANY | SCAC3 | ||
| 7447 | RRTV | R & R TRUCKING | SCAC3 | ||
| 7448 | RRTX | *(TTX) UMLER TEST ROAD NO.14 | PWRC | ||
| 7449 | RRTX | +RAILROAD TECHNOLOGY CORP. | PWRC | ||
| 7450 | RRTX | RAILROAD TECHNOLOGY CORPORATION | SCAC4 | ||
| 7451 | RRTY | R & R TRANSFER | SCAC3 | ||
| 7452 | RRTY | ROBERTSONS TRANSPORT | SCAC4 | ||
| 7453 | RRU | Cirrus | ICAO1 | ||
| 7454 | RRUC | R & R TRUCKING INC (LOGISTICS DIVIS | SCAC4 | ||
| 7455 | RRUK | R AND R TRUCKING INC. | SCAC3 | ||
| 7456 | RRUK | R & R TRUCKING INC | SCAC4 | ||
| 7457 | RRUN | ROAD RUNNER TRAVEL & TOURS | SCAC3 | ||
| 7458 | RRV | Mombasa Air Safari | ICAO1 | ||
| 7459 | RRVD | RIVER RIDGE LOGISTICS LLC | SCAC4 | ||
| 7460 | RRVI | RED RIVER INTERNATIONAL LLC | SCAC4 | ||
| 7461 | RRVL | REYNALDO RIVERA-SCULPTOR INC | SCAC4 | ||
| 7462 | RRVM | RAMOS RIVERA, MAURICIO | SCAC4 | ||
| 7463 | RRVN | ROAD RUNNER VAN LINES INC | SCAC4 | ||
| 7464 | RRVR | ROBERTS RIVER RIDES INC | SCAC3 | ||
| 7465 | RRVR | RED RIVER HOLDINGS LLC | SCAC4 | ||
| 7466 | RRVT | ROOT RIVER VALLEY TRANSFER, INC | SCAC3 | ||
| 7467 | RRVT | ROOT RIVER VALLEY TRANSFER INC | SCAC4 | ||
| 7468 | RRVW | Red River Valley and Western R.R. | added 1/1988; 1/1994-7/2005 | NAKINA | |
| 7469 | RRVW | Red River Valley and Western R.R. | added 1/88; 1/94-7/2000 | NRHS | |
| 7470 | RRVW | RED RIVER VALLEY & WESTERN RAILROAD CO. | PWRC | ||
| 7471 | RRVW | Red River Valley and Western Railroad | RSRV | ||
| 7472 | RRVW | RED RIVER VALLEY & WESTERN RAILROAD | SCAC3 | ||
| 7473 | RRVW | RED RIVER VALLEY & WESTERN RAILROAD | SCAC4 | ||
| 7474 | RRWA | RUN-R-WAY EXPRESS CO INC | SCAC3 | ||
| 7475 | RRWA | RUN-R-WAY EXPRESS CO INC | SCAC4 | ||
| 7476 | RRWL | REEVAS RITINGS WITH RUACH LLC | SCAC4 | ||
| 7477 | RRWO | RENFROWS TRUCKING INC | SCAC4 | ||
| 7478 | RRWR | RADOVICH, R W TRANSPORT INC | SCAC4 | ||
| 7479 | RRWT | RED ARROW TRUCKING | SCAC3 | ||
| 7480 | RRWX | THE SOUTH CAROLINA RAILROAD MUSEUM | SCAC4 | ||
| 7481 | RRXB | R & R TRANSPORT LLC | SCAC4 | ||
| 7482 | RRXC | RED ROSE TRANSPORTATION INC | SCAC4 | ||
| 7483 | RRXE | R&R EXPRESS | SCAC3 | ||
| 7484 | RRXE | R & R EXPRESS | SCAC4 | ||
| 7485 | RRXI | RAMAR TRANSPORTATION INC | SCAC4 | ||
| 7486 | RRXM | R & R TRANSPORTATION | SCAC4 | ||
| 7487 | RRXN | R & R EXPRESS INC | SCAC4 | ||
| 7488 | RRXP | ROAD RUNNER PACKAGE EXPRESS | SCAC3 | ||
| 7489 | RRXP | RIVERRUN EXPRESS INC | SCAC4 | ||
| 7490 | RRXQ | ROMIR EXPRESS INC | SCAC4 | ||
| 7491 | RRXS | R & R EXPRESS | SCAC4 | ||
| 7492 | RRXT | RREX TRUCKING INC | SCAC4 | ||
| 7493 | RRXU | REFTRADE RENTAL B V | SCAC4 | ||
| 7494 | RRY | Tbilisi Aviation University | ICAO1 | ||
| 7495 | RRYP | REY REY PRODUCE INC | SCAC4 | ||
| 7496 | RRYS | RIGEL REEDEREI GMBH & CO KG MT | SCAC4 | ||
| 7497 | RRYT | ROAD READY TRUCKING CO | SCAC3 | ||
| 7498 | RRZ | Rollright Aviation | ICAO1 | ||
| 7499 | RRZR | RAMOS RODRIGUEZ, RICARDO GUADALUPE | SCAC4 | ||
| 7500 | RS | Roberval and Saguenay Ry. Co. | 10/1966 & 1/1975-7/2005; eliminated 1/2008 | NAKINA |