| 8501 | RTNQ | R & T TRANSPORTATION INC | SCAC4 | ||
| 8502 | RTNR | ROCK THEN ROLL INC | SCAC3 | ||
| 8503 | RTNS | RELIABLE TRANSFER & STORAGE COMPANY | SCAC3 | ||
| 8504 | RTNT | ROMANS 10:9 TOURS INCORPORATED | SCAC3 | ||
| 8505 | RTNY | ROCHA, TONY N JR | SCAC3 | ||
| 8506 | RTO | Arhabaev Tourism Airlines | ICAO1 | ||
| 8507 | RTO | Rio Tinto Group | Mining company | AUS | TRAFFIC |
| 8508 | RTOA | RESOURCE TRANSPORTATION OF AMERICA | SCAC3 | ||
| 8509 | RTOB | RICHS TOURS | SCAC3 | ||
| 8510 | RTOC | RUTH OIL COMPANY | SCAC4 | ||
| 8511 | RTOD | Real: RTO, City: Dijon | F | TRAFFIC | |
| 8512 | RTOG | Regionstog A/S | 2009 - | DK | jernbanen.dk |
| 8513 | RTOG | Regionstog A/S | 2009 | DK | TRAFFIC |
| 8514 | RTOG | Regionstog A/S | DK | VKM | |
| 8515 | RTOH | R B TRANSPORTATION | SCAC3 | ||
| 8516 | RTOI | RAM TRANSPORTATION INC | SCAC3 | ||
| 8517 | RTOI | RMA TRANSPORTATION SERVICES INC | SCAC4 | ||
| 8518 | RTOL | ROYAL TRANSPORT LTD | SCAC3 | ||
| 8519 | RTOL | ROAD TRANSPORTATION SOLUTIONS | SCAC4 | ||
| 8520 | RTON | RACER TRANSPORTATION INC | SCAC3 | ||
| 8521 | RTON | ROUTE ONE TRANSPORT | SCAC4 | ||
| 8522 | RTOO | RAJASON TOOLS INC | SCAC4 | ||
| 8523 | RTOP | RED TOP CABS INC | SCAC3 | ||
| 8524 | RTOQ | RILEYS TRANSPORTATION OF OHIO INC | SCAC4 | ||
| 8525 | RTOS | R TRANSPORT SERVICES LLC | SCAC4 | ||
| 8526 | RTOW | RUBENS TOWING | SCAC4 | ||
| 8527 | RTOZ | (REAZ) RETIRED 04-06-93 ATP (ACI 2490) | PWRC | ||
| 8528 | RTPF | ROUTED THRU-PAC INC | SCAC3 | ||
| 8529 | RTPF | ROUND TOP FARM | SCAC4 | ||
| 8530 | RTPG | ROUND TRIP TRANSPORT LLC | SCAC4 | ||
| 8531 | RTPI | ROUTH TRANSPORTATION | SCAC3 | ||
| 8532 | RTPI | ROUTH TRANSPORTATION | SCAC4 | ||
| 8533 | RTPJ | RST TRANSPORT INC | SCAC3 | ||
| 8534 | RTPK | R & T PRODUCTS INC | SCAC4 | ||
| 8535 | RTPL | REGAL TENT PRODUCTIONS LTD | SCAC4 | ||
| 8536 | RTPM | RANGER TRANSPORT INC | SCAC3 | ||
| 8537 | RTPM | RANGER TRANSPORT INC | SCAC4 | ||
| 8538 | RTPN | ROBERTS TRANSPORTATION | SCAC3 | ||
| 8539 | RTPO | RELIANCE TRANSPORT CO | SCAC3 | ||
| 8540 | RTPP | RAPID TRANSPORT CORPORATION | SCAC3 | ||
| 8541 | RTPR | REAL TRANSPORTATION | SCAC3 | ||
| 8542 | RTPR | RT EXPRESS LLC | SCAC4 | ||
| 8543 | RTPS | REDMOND TRANSPORTATION SYSTEMS | SCAC3 | ||
| 8544 | RTPS | ROUSE TRANSPORT LLC | SCAC4 | ||
| 8545 | RTPT | RIC TRANSPORT S.A | SCAC3 | ||
| 8546 | RTPV | ROCHES TRANSPORTING INC | SCAC3 | ||
| 8547 | RTPX | General Electric Railcar Corp. | added 4/2004; 7/2005 | NAKINA | |
| 8548 | RTPX | Savage-Tolk Energy Services | added 4/2001; eliminated 4/2004 | NAKINA | |
| 8549 | RTPX | Wheelabrator Coal Services Co. | added 4/1982; 1/1994-7/2000; eliminated 4/2001 | NAKINA | |
| 8550 | RTPX | Wheelabrator Coal Services Co. | added 4/82; 1/94-7/2000; eliminated 4/2001 | NRHS | |
| 8551 | RTPX | Savage-Tolk Energy Services | added 4/2001 | NRHS | |
| 8552 | RTPX | *SAVAGE-TOLK ENERGY SERVICES [(WCSX) WHEELABRATOR COAL SERVICES CO.] | PWRC | ||
| 8553 | RTPX | +GENERAL ELECTRIC RAIL SERVICES CORP. | PWRC | ||
| 8554 | RTPX | Wheelabrator Coal Services (GE Rail Services) | RSRV | ||
| 8555 | RTPX | GENERAL ELECTRIC RAILCAR SERVICES C | SCAC4 | ||
| 8556 | RTQ | Air Turquoise | ICAO1 | ||
| 8557 | RTQA | RT2000 CARTAGE | SCAC4 | ||
| 8558 | RTQI | R.T.Q. INC. | SCAC4 | ||
| 8559 | RTQL | RELIABLE TRANSPORT (QUEBEC) INC | SCAC3 | ||
| 8560 | RTQS | ROBART TRUCKING SERVICE INC | SCAC3 | ||
| 8561 | RTR | Rotatur | ICAO1 | ||
| 8562 | RTRA | R AND D TRANSPORTATION | SCAC3 | ||
| 8563 | RTRA | REINHARD TRANSPORTATION LLC | SCAC4 | ||
| 8564 | RTRAN | RailTrans | A | TRAFFIC | |
| 8565 | RTRB | ROSE TRUCK BROKERS INC | SCAC3 | ||
| 8566 | RTRC | RICHMOND TERMINAL RAILWAY CO. | PWRC | ||
| 8567 | RTRC | REED TRUCKING COMPANY INC | SCAC3 | ||
| 8568 | RTRH | R T R TRUCKING INC | SCAC3 | ||
| 8569 | RTRI | ROCOR TRUCK LINES INC | SCAC3 | ||
| 8570 | RTRI | Railway Technical Research Institute | J | TRAFFIC | |
| 8571 | RTRJ | R T R INC | SCAC4 | ||
| 8572 | RTRK | ROBERTSON, T R TRUCKING INC | SCAC4 | ||
| 8573 | RTRL | ROBERTS TRUCK RENTAL & LEASING INC | SCAC3 | ||
| 8574 | RTRM | RAM TRUCKING INC | SCAC3 | ||
| 8575 | RTRN | RICE TRANSPORTATION | SCAC3 | ||
| 8576 | RTRO | RETROSPECT TRANSPORTATION INC | SCAC3 | ||
| 8577 | RTRQ | RAFFAELE, T TRUCKING CORP | SCAC3 | ||
| 8578 | RTRQ | RATE TRANSPORT CO INC | SCAC4 | ||
| 8579 | RTRR | ROADTRAIN TRAILER REPAIR INC | SCAC3 | ||
| 8580 | RTRR | ROADRUNNER TRANSPORTATION | SCAC4 | ||
| 8581 | RTRT | ROSE TRAILER TOTERS | SCAC3 | ||
| 8582 | RTRU | ROAD TRAILER RENTALS INCORPORATED | PWRC | ||
| 8583 | RTRU | Road Trailer Rentals | RSRV | ||
| 8584 | RTRV | RAM TOUR & TRAVEL | SCAC3 | ||
| 8585 | RTRV | REEVES TRUCKING | SCAC4 | ||
| 8586 | RTRW | REDDEN TRUCKING | SCAC3 | ||
| 8587 | RTRX | Rocky Mountain Transportation Services | added 7/1995; 7/2000-7/2005 | NAKINA | |
| 8588 | RTRX | E.I. du Pont de Nemours & Co., Inc. | added 7/1963; 7/1965; eliminated 1/1966 | NAKINA | |
| 8589 | RTRX | E.I. du Pont de Nemours & Co., Inc. | added 7/63; 7/65; eliminated 1/66 | NRHS | |
| 8590 | RTRX | Rocky Mountain Transportation Services | added 7/95; 7/2000 | NRHS | |
| 8591 | RTRX | *E. I. DU PONT DE NEMOURS & CO., INC. | PWRC | ||
| 8592 | RTRX | *RAILTOWN 1897 RAILROAD | PWRC | ||
| 8593 | RTRX | +ROCKY MOUNTAIN TRANSPORTATION SERVICES | PWRC | ||
| 8594 | RTRX | Rocky Mountain Transportation Services | RSRV | ||
| 8595 | RTRX | ROCKY MOUNTAIN TRANSPORTATIN SERVIC | SCAC4 | ||
| 8596 | RTRY | RICHARDSON TRUCKING | SCAC4 | ||
| 8597 | RTRZ | ROAD TRAILER RENTALS LIMITED | PWRC | ||
| 8598 | RTRZ | Road Trailer Rentals Limited | RSRV | ||
| 8599 | RTRZ | ROAD TRAILER RENTALS, INC. | SCAC4 | ||
| 8600 | RTS | Relief Transport Services | ICAO1 |