| 601 | RAWX | Riverside Acid Works | Apr-38 | NRHS | |
| 602 | RAWX | Riverside Acid & Inhibitor Co. | Jan-52 | NRHS | |
| 603 | RAWX | Platte River Power Authority | added 4/84; eliminated 4/90; 1/94-7/2000 | NRHS | |
| 604 | RAWX | *RIVERSIDE ACID INHIBITOR CO. [RIVERSIDE ACID WORKS] | PWRC | ||
| 605 | RAWX | +PLATTE RIVER POWER AUTHORITY | PWRC | ||
| 606 | RAWX | Platte River Power Authority | RSRV | ||
| 607 | RAWX | PLATTE RIVER POWER AUTHORITY | SCAC4 | ||
| 608 | RAWY | RATHWAY, EDWARD R TRUCKING INC | SCAC3 | ||
| 609 | RAX | Royal Air Freight | ICAO1 | ||
| 610 | RAX | RPI-AAR Cooperative Test Program | 1/1975-1/1980; 1/1994 (not listed); 7/2000-7/2005 (not listed) | NAKINA | |
| 611 | RAX | RPI-AAR Cooperative Test Program | 1/75-7/2000 | NRHS | |
| 612 | RAX | RPI-AAR COOPERATIVE TEST PROGRAM | PWRC | ||
| 613 | RAX | RPI-AAR Cooperative Test Program | RSRV | ||
| 614 | RAXE | ROAD AIR EXPRESS | SCAC3 | ||
| 615 | RAXL | ROBERTS AUTO TRANSPORT LLC | SCAC4 | ||
| 616 | RAXN | ROCCA TRANSPORT SERVICES INC | SCAC4 | ||
| 617 | RAXQ | RAIDERS EXPRESS INC | SCAC3 | ||
| 618 | RAXR | RAY EXPRESS INC | SCAC3 | ||
| 619 | RAXS | RAYMOND EXPRESS INTERNATIONAL | SCAC3 | ||
| 620 | RAXS | RAYMOND EXPRESS INTERNATIONAL | SCAC4 | ||
| 621 | RAXT | R A TRANSPORT | SCAC4 | ||
| 622 | RAYA | RAYAN | SCAC4 | ||
| 623 | RAYC | RAYS TRUCKING | SCAC3 | ||
| 624 | RAYC | RAYO TRANSFER | SCAC4 | ||
| 625 | RAYF | RAY TRANSPORT INC | SCAC3 | ||
| 626 | RAYG | RAY, PAUL TRUCKING | SCAC4 | ||
| 627 | RAYH | RAYMOND, HARVEY | SCAC4 | ||
| 628 | RAYJ | RAY, JOE D | SCAC3 | ||
| 629 | RAYK | RAYTRANS TRUCKING | SCAC4 | ||
| 630 | RAYM | RAY THE MOVER OF MANCHESTER, INC | SCAC3 | ||
| 631 | RAYN | Rayonier Inc. | USA | TRAFFIC | |
| 632 | RAYP | RAY, J D COMPANY | SCAC3 | ||
| 633 | RAYQ | RAY TRUCKING COMPANY INC | SCAC3 | ||
| 634 | RAYQ | RAY-MAC INC | SCAC4 | ||
| 635 | RAYR | RAY TRANSPORT | SCAC4 | ||
| 636 | RAYS | RAYS TRANSFER | SCAC3 | ||
| 637 | RAYT | RAYS TRANSFER | SCAC3 | ||
| 638 | RAYV | RAYS MOVERS | SCAC3 | ||
| 639 | RAYV | RAYS MOVERS INC | SCAC4 | ||
| 640 | RAYW | RAYS TRUCKING CO | SCAC3 | ||
| 641 | RAYX | Peck Iron & Metal Co., Inc. | added 7/1961; 7/1965-10/1966; eliminated 10/1967 | NAKINA | |
| 642 | RAYX | Peck Iron & Metal Co., Inc. | 7/65-10/66; eliminated 10/67 | NRHS | |
| 643 | RAYX | PECK IRON & METAL CO., INC. | PWRC | ||
| 644 | RAYX | PECK IRON & METAL CO INC | SCAC3 | ||
| 645 | RAYY | RAYS TRANSFER COMPANY | SCAC3 | ||
| 646 | RAYY | RAYS TRANSFER COMPANY | SCAC4 | ||
| 647 | RAZ | Rijnmond Air Services | ICAO1 | ||
| 648 | RAZI | RAZER INC | SCAC4 | ||
| 649 | RAZL | R A Z LINES | SCAC3 | ||
| 650 | RAZO | RAZORBACK MOVING & STORAGE | SCAC3 | ||
| 651 | RAZP | RAZ TRANSPORTATION COMPANY | SCAC4 | ||
| 652 | RAZR | RAZOR EDGE TRUCKING LLC | SCAC4 | ||
| 653 | RB | Rigibahnen | CH | TRAFFIC | |
| 654 | RB | Rigi-Bahnen AG | CH | VKM | |
| 655 | RBA | Royal Brunei Airlines | IATA: BI | ICAO1 | |
| 656 | RBA | Regionalbus Augsburg GmbH | D | TRAFFIC | |
| 657 | RBAE | REBEL AIR EXPRESS | SCAC3 | ||
| 658 | RBAF | ROBERTS AIR FREIGHT | SCAC3 | ||
| 659 | RBAG | RO/BAG TRANSPORTATION INC | SCAC3 | ||
| 660 | RBAHN | Regiobahn ErlebnisZug GmbH | A | TRAFFIC | |
| 661 | RBAI | ROBAL LOGISTICS INC | SCAC3 | ||
| 662 | RBAI | R & B TRANSPORT | SCAC4 | ||
| 663 | RBAK | ROBERTA TRUCKING CO INC | SCAC3 | ||
| 664 | RBAL | RED BALL INC | SCAC3 | ||
| 665 | RBAL | RBA LOGISTICS INC | SCAC4 | ||
| 666 | RBAN | ROBINSON, ALLEN E | SCAC3 | ||
| 667 | RBAO | RBA TRANSPORTATION SERVICES | SCAC3 | ||
| 668 | RBAP | RELIABLE TRANSPORTATION ASSOCIATES | SCAC3 | ||
| 669 | RBAS | ROBINSON, ART & SONS | SCAC3 | ||
| 670 | RBAT | RELIABLE AUTO TRANSPORT | SCAC3 | ||
| 671 | RBAU | RABANCO COMPANIES | SCAC4 | ||
| 672 | RBAU | Reisse-Bau GmbH | DE | VKM | |
| 673 | RBAV | ROBCHART BV | SCAC4 | ||
| 674 | RBAW | ROBL, A W TRANSPORT | SCAC3 | ||
| 675 | RBAZ | (REAZ) RETIRED 04-06-93 ATP (ACI 2395) | PWRC | ||
| 676 | RBB | Rabbit-Air | ICAO1 | ||
| 677 | RBB | Regiobahn Bitterfeld GmbH | Bitterfeld (Connex-Gruppe > Veolia Verkehr > Captrain) | D | privat-bahn.de |
| 678 | RBB | BNSF [BURLINGTON NORTHERN RAILROAD CO.] | PWRC | ||
| 679 | RBB | Regiobahn Bitterfeld-Berlin GmbH | D | TRAFFIC | |
| 680 | RBB | Regiobahn Bitterfeld | DE | VKM | |
| 681 | RBBC | RABBIT TRUCKING CORP | SCAC3 | ||
| 682 | RBBC | RIVER BEND BROKERAGE CO | SCAC4 | ||
| 683 | RBBE | RIBBE, DANIEL L TRUCKING | SCAC3 | ||
| 684 | RBBF | ROBBINS FLEISING FORWARDING INC | SCAC3 | ||
| 685 | RBBH | RV BOAT AND BIKE TRANSPORT LLC | SCAC4 | ||
| 686 | RBBI | ROBBINS TRUCKING INC | SCAC3 | ||
| 687 | RBBI | ROBBINS, JEFF | SCAC4 | ||
| 688 | RBBK | R B & B TRUCKING INC | SCAC3 | ||
| 689 | RBBL | ROBERTS, B L | SCAC4 | ||
| 690 | RBBN | BNSF Ry. Co. | added 4/2005; 7/2005 | NAKINA | |
| 691 | RBBN | Burlington Northern R.R. Co. | added 7/1981; 1/1994; eliminated 4/2005 | NAKINA | |
| 692 | RBBN | Burlington Northern Inc. | 1/1980; eliminated 7/1981 | NAKINA | |
| 693 | RBBN | Burlington Northern R.R. Co. | added 4/1975 | NAKINA | |
| 694 | RBBN | Burlington Northern R.R. Co. | added 4/75 | NRHS | |
| 695 | RBBN | Burlington Northern Inc. | 1/80; eliminated 7/81 | NRHS | |
| 696 | RBBN | Burlington Northern R.R. Co. | added 7/81; 1/94 | NRHS | |
| 697 | RBBN | BNSF [BURLINGTON NORTHERN RAILROAD CO.] | PWRC | ||
| 698 | RBBN | Chicago, Burlington and Quincy Railroad (BNSF Railway) | RSRV | ||
| 699 | RBBO | R B TRUCKING | SCAC3 | ||
| 700 | RBBP | RILEYS B & B EXPRESS INC | SCAC3 |