| 701 | RBBQ | BNSF Ry. Co. | added 4/2005; 7/2005 | NAKINA | |
| 702 | RBBQ | Burlington Northern R.R. Co. | added 7/1981; 1/1994; eliminated 4/2005 | NAKINA | |
| 703 | RBBQ | Burlington Northern Inc. | 1/1975-1/1980; eliminated 7/1981 | NAKINA | |
| 704 | RBBQ | Chicago, Burlington and Quincy R.R. (Burlington Northern) | 4/1970 | NAKINA | |
| 705 | RBBQ | Chicago, Burlington and Quincy R.R., Co. | 7/1965-10/1966 | NAKINA | |
| 706 | RBBQ | Chicago, Burlington and Quincy R.R., Co. | 7/65-10/66 | NRHS | |
| 707 | RBBQ | Chicago, Burlington and Quincy R.R. (Burlington Northern) | Apr-70 | NRHS | |
| 708 | RBBQ | Burlington Northern Inc. | 1/75-1/80; eliminated 7/81 | NRHS | |
| 709 | RBBQ | Burlington Northern R.R. Co. | added 7/81; 1/94 | NRHS | |
| 710 | RBBQ | BNSF [BURLINGTON NORTHERN RAILROAD CO.; CHICAGO, BURLINGTON & QUINCEY RR CO.] | PWRC | ||
| 711 | RBBQ | Chicago, Burlington and Quincy Railroad (BNSF Railway) | RSRV | ||
| 712 | RBBR | RUBBER DUCKLING INC | SCAC4 | ||
| 713 | RBBR | Regionalbus Braunschweig GmbH | Real: RBB | D | TRAFFIC |
| 714 | RBBS | ROBBINS EXPRESS INC | SCAC3 | ||
| 715 | RBBS | ROBBINS OIL CO | SCAC4 | ||
| 716 | RBBT | REED, BILLY TRUCKING | SCAC4 | ||
| 717 | RBBW | BNSF [BURLINGTON NORTHERN RAILROAD CO.] | PWRC | ||
| 718 | RBBW | ROERD BRAREN BEREEDERUNGS GMBH & CO | SCAC4 | ||
| 719 | RBBX | Ringling Bros. and Barnum & Bailey | 7/2000-7/2005 (not listed) | NAKINA | |
| 720 | RBBX | Western Fruit Express Co. | added 10/1970; 1/1975-1/1980; eliminated 4/1980; 1/1994 (not listed) | NAKINA | |
| 721 | RBBX | Burlington Refrigerator Express Co. | added 4/1957; 10/1957-4/1970; eliminated 10/1970 | NAKINA | |
| 722 | RBBX | Burlington Refrigerator Express Co. | added 4/57; 10/57-4/70; eliminated 10/70 | NRHS | |
| 723 | RBBX | Western Fruit Express Co. | added 10/70; 1/75-1/80; eliminated 4/80; 1/94 | NRHS | |
| 724 | RBBX | Ringling Bros. and Barnum & Bailey | Jul-00 | NRHS | |
| 725 | RBBX | *(BN) RETIRED 08-30-93 ATP [WESTERN FRUIT EXPRESS CO.; BURLINGTON REFRIGERATOR EXPRESS] | PWRC | ||
| 726 | RBBX | +RINGLING BROS. AND BARNUM AND BAILEY | PWRC | ||
| 727 | RBBX | Ringling Brothers and Barnum and Bailey Circus | RSRV | ||
| 728 | RBBX | RINGLING BROS. AND BARNUM & BAILEY | SCAC4 | ||
| 729 | RBBX | Ringling Bros. Barnum & Bailey | Circus trains | USA | TRAFFIC |
| 730 | RBBY | ROBB, TERRY CARTAGE COMPANY INC | SCAC3 | ||
| 731 | RBC | Republicair | ICAO1 | ||
| 732 | RBC | READY BUS LINE COMPANY | SCAC4 | ||
| 733 | RBCA | RED BUD OIL COMPANY | SCAC4 | ||
| 734 | RBCE | RIBCO ENTERPRISES | SCAC3 | ||
| 735 | RBCG | ROBINS CARTAGE | SCAC3 | ||
| 736 | RBCG | ROBINSON, C H WORLDWIDE (CONSOLIDAT | SCAC4 | ||
| 737 | RBCH | RABIDIS, CHRIS | SCAC3 | ||
| 738 | RBCI | ROBERTS CONSOLIDATED INDUSTRIES INC | SCAC3 | ||
| 739 | RBCJ | RIVER BEND CARRIERS INC | SCAC4 | ||
| 740 | RBCK | ROBERSON TRUCKING CO | SCAC3 | ||
| 741 | RBCL | ROBINSON, C H WORLDWIDE (CONSOLIDAT | SCAC4 | ||
| 742 | RBCM | RANKIN BIOMEDICAL CORP | SCAC4 | ||
| 743 | RBCN | R B TRUCKING | SCAC4 | ||
| 744 | RBCO | RABCO TRUCKING | SCAC4 | ||
| 745 | RBCP | RBC TRANSPORT LLC | SCAC4 | ||
| 746 | RBCQ | REMORQUAGE BURSTALL CONRAD INC | SCAC4 | ||
| 747 | RBCR | R B CARRIERS INC | SCAC3 | ||
| 748 | RBCS | BNSF Ry. Co. | added 4/2005; 7/2005 | NAKINA | |
| 749 | RBCS | Burlington Northern R.R. Co. | added 4/1982; 1/1994; eliminated 4/2005 | NAKINA | |
| 750 | RBCS | The Colorado and Southern Ry. Co. | 1/1975-1/1980; eliminated 4/1982 | NAKINA | |
| 751 | RBCS | Colorado & Southern Ry. Co. | 4/1961-4/1970 | NAKINA | |
| 752 | RBCS | Colorado & Southern Ry. Co. | 4/61-4/70 | NRHS | |
| 753 | RBCS | The Colorado and Southern Ry. Co. | 1/75-1/80; eliminated 4/82 | NRHS | |
| 754 | RBCS | Burlington Northern R.R. Co. | added 4/82; 1/94 | NRHS | |
| 755 | RBCS | BNSF [BURLINGTON NORTHERN RAILROAD CO.; COLORADO & SOUTHERN RY.] | PWRC | ||
| 756 | RBCS | Rail-Bridge Corporation (BNSF Railway) | RSRV | ||
| 757 | RBCS | RELIANCE BULK CARRIERS LLC | SCAC4 | ||
| 758 | RBCU | (PCBX) RAILBRIDGE CORPORATION | PWRC | ||
| 759 | RBCU | Rail-Bridge Corporation (RB Holding) | RSRV | ||
| 760 | RBCU | THE RAIL-BRIDGE CORP | SCAC3 | ||
| 761 | RBCU | RB HOLDING BV | SCAC4 | ||
| 762 | RBCX | The Rail-Bridge Corp. | added 10/1990; 1/1994; 7/2000-7/2005 (not listed) | NAKINA | |
| 763 | RBCX | The Rail-Bridge Corp. | added 10/90; 1/94-7/2000 | NRHS | |
| 764 | RBCX | RAIL-BRIDGE CORPORATION | PWRC | ||
| 765 | RBCX | Rail-Bridge Corporation | RSRV | ||
| 766 | RBCX | RAILBRIDGE CORPORATION | SCAC4 | ||
| 767 | RBCY | R & B COMPANY | SCAC3 | ||
| 768 | RBD | Trans World Express | ICAO1 | ||
| 769 | RBDB | ROMBIS, DEBRA | SCAC4 | ||
| 770 | RBDC | RAIL-BRIDGE CORPORATION, THE | SCAC3 | ||
| 771 | RBDC | RBD EXPRESS INC | SCAC4 | ||
| 772 | RBDE | ROBIDEAUS EXPRESS | SCAC3 | ||
| 773 | RBDE | ROBARDS EXPRESS INC | SCAC4 | ||
| 774 | RBDI | REBEL DELIVERY SERVICE | SCAC3 | ||
| 775 | RBDL | ROBINSON, DON SAND AND GRAVEL INC | SCAC3 | ||
| 776 | RBDM | RUBY DOME INC | SCAC3 | ||
| 777 | RBDM | ROBICHAUD, D M ASSOCIATES LTD | SCAC4 | ||
| 778 | RBDP | ROBIDEAUX EXPRESS | SCAC4 | ||
| 779 | RBDQ | ROBERDEAU VAN & STORAGE | SCAC3 | ||
| 780 | RBDR | RBD TRANSPORT | SCAC4 | ||
| 781 | RBDS | ROBERTS DELIVERY SERVICE INC | SCAC3 | ||
| 782 | RBDS | RABAS, DAVE & SON INC | SCAC4 | ||
| 783 | RBDU | RABANCO COMPANIES | SCAC4 | ||
| 784 | RBDV | ROBERTS DELIVERIES | SCAC3 | ||
| 785 | RBDW | RBD EXPRESS TWO (2) LLC | SCAC4 | ||
| 786 | RBE | Aur Rum Benin | ICAO1 | ||
| 787 | RBE | Rheinisch-Bergische-Eisenbahn GmbH | Mettmann (Connex-Gruppe > Veolia Verkehr) | D | privat-bahn.de |
| 788 | RBE | Rheinisch-Bergische Eisenbahn-Gesellschaft mbH | DE | VKM | |
| 789 | RBEA | R & B EXPRESS INC | SCAC4 | ||
| 790 | RBEC | R B EXPRESS INC | SCAC4 | ||
| 791 | RBEE | RBX INC | SCAC3 | ||
| 792 | RBEE | RBX INC | SCAC4 | ||
| 793 | RBEG | ROBERT, GERALD TRUCKING INC | SCAC3 | ||
| 794 | RBEH | RELIABLE CONTAINER CORP | SCAC4 | ||
| 795 | RBEI | ROLLING B ENTERPRISES INC | SCAC4 | ||
| 796 | RBEJ | RAINBOW EXPRESS INC | SCAC3 | ||
| 797 | RBEK | ROBERTS TRUCKING | SCAC3 | ||
| 798 | RBEK | ROBERTS TRUCKING | SCAC4 | ||
| 799 | RBEL | RABEL, ELMER M | SCAC3 | ||
| 800 | RBEM | ROBERTS, E & M INC | SCAC3 |