| 801 | RBBN | Chicago, Burlington and Quincy Railroad (BNSF Railway) | | | RSRV |
| 802 | RBBO | R B TRUCKING | | | SCAC3 |
| 803 | RBBP | RILEYS B & B EXPRESS INC | | | SCAC3 |
| 804 | RBBQ | BNSF Ry. Co. | added 4/2005; 7/2005 | | NAKINA |
| 805 | RBBQ | Burlington Northern R.R. Co. | added 7/1981; 1/1994; eliminated 4/2005 | | NAKINA |
| 806 | RBBQ | Burlington Northern Inc. | 1/1975-1/1980; eliminated 7/1981 | | NAKINA |
| 807 | RBBQ | Chicago, Burlington and Quincy R.R. (Burlington Northern) | 4/1970 | | NAKINA |
| 808 | RBBQ | Chicago, Burlington and Quincy R.R., Co. | 7/1965-10/1966 | | NAKINA |
| 809 | RBBQ | Chicago, Burlington and Quincy R.R., Co. | 7/65-10/66 | | NRHS |
| 810 | RBBQ | Chicago, Burlington and Quincy R.R. (Burlington Northern) | Apr-70 | | NRHS |
| 811 | RBBQ | Burlington Northern Inc. | 1/75-1/80; eliminated 7/81 | | NRHS |
| 812 | RBBQ | Burlington Northern R.R. Co. | added 7/81; 1/94 | | NRHS |
| 813 | RBBQ | BNSF [BURLINGTON NORTHERN RAILROAD CO.; CHICAGO, BURLINGTON & QUINCEY RR CO.] | | | PWRC |
| 814 | RBBQ | Chicago, Burlington and Quincy Railroad (BNSF Railway) | | | RSRV |
| 815 | RBBR | RUBBER DUCKLING INC | | | SCAC4 |
| 816 | RBBR | Regionalbus Braunschweig GmbH | Real: RBB | D | TRAFFIC |
| 817 | RBBS | ROBBINS EXPRESS INC | | | SCAC3 |
| 818 | RBBS | ROBBINS OIL CO | | | SCAC4 |
| 819 | RBBT | REED, BILLY TRUCKING | | | SCAC4 |
| 820 | RBBU | BESED LLC | | RUS | BIC |
| 821 | RBBW | BNSF [BURLINGTON NORTHERN RAILROAD CO.] | | | PWRC |
| 822 | RBBW | ROERD BRAREN BEREEDERUNGS GMBH & CO | | | SCAC4 |
| 823 | RBBX | Ringling Bros. and Barnum & Bailey | 7/2000-7/2005 (not listed) | | NAKINA |
| 824 | RBBX | Western Fruit Express Co. | added 10/1970; 1/1975-1/1980; eliminated 4/1980; 1/1994 (not listed) | | NAKINA |
| 825 | RBBX | Burlington Refrigerator Express Co. | added 4/1957; 10/1957-4/1970; eliminated 10/1970 | | NAKINA |
| 826 | RBBX | Burlington Refrigerator Express Co. | added 4/57; 10/57-4/70; eliminated 10/70 | | NRHS |
| 827 | RBBX | Western Fruit Express Co. | added 10/70; 1/75-1/80; eliminated 4/80; 1/94 | | NRHS |
| 828 | RBBX | Ringling Bros. and Barnum & Bailey | Jul-00 | | NRHS |
| 829 | RBBX | *(BN) RETIRED 08-30-93 ATP [WESTERN FRUIT EXPRESS CO.; BURLINGTON REFRIGERATOR EXPRESS] | | | PWRC |
| 830 | RBBX | +RINGLING BROS. AND BARNUM AND BAILEY | | | PWRC |
| 831 | RBBX | Ringling Brothers and Barnum and Bailey Circus | | | RSRV |
| 832 | RBBX | RINGLING BROS. AND BARNUM & BAILEY | | | SCAC4 |
| 833 | RBBX | Ringling Bros. Barnum & Bailey | Circus trains | USA | TRAFFIC |
| 834 | RBBY | ROBB, TERRY CARTAGE COMPANY INC | | | SCAC3 |
| 835 | RBC | Republicair, S.A. de C.V. | Callsign: Republicair, | MEX | AVCODES |
| 836 | RBC | Republicair | | | ICAO1 |
| 837 | RBC | READY BUS LINE COMPANY | | | SCAC4 |
| 838 | RBCA | RED BUD OIL COMPANY | | | SCAC4 |
| 839 | RBCE | RIBCO ENTERPRISES | | | SCAC3 |
| 840 | RBCG | ROBINS CARTAGE | | | SCAC3 |
| 841 | RBCG | ROBINSON, C H WORLDWIDE (CONSOLIDAT | | | SCAC4 |
| 842 | RBCH | RABIDIS, CHRIS | | | SCAC3 |
| 843 | RBCI | ROBERTS CONSOLIDATED INDUSTRIES INC | | | SCAC3 |
| 844 | RBCJ | RIVER BEND CARRIERS INC | | | SCAC4 |
| 845 | RBCK | ROBERSON TRUCKING CO | | | SCAC3 |
| 846 | RBCL | ROBINSON, C H WORLDWIDE (CONSOLIDAT | | | SCAC4 |
| 847 | RBCM | RANKIN BIOMEDICAL CORP | | | SCAC4 |
| 848 | RBCN | R B TRUCKING | | | SCAC4 |
| 849 | RBCO | RABCO TRUCKING | | | SCAC4 |
| 850 | RBCP | RBC TRANSPORT LLC | | | SCAC4 |
| 851 | RBCQ | REMORQUAGE BURSTALL CONRAD INC | | | SCAC4 |
| 852 | RBCR | R B CARRIERS INC | | | SCAC3 |
| 853 | RBCS | BNSF Ry. Co. | added 4/2005; 7/2005 | | NAKINA |
| 854 | RBCS | Burlington Northern R.R. Co. | added 4/1982; 1/1994; eliminated 4/2005 | | NAKINA |
| 855 | RBCS | The Colorado and Southern Ry. Co. | 1/1975-1/1980; eliminated 4/1982 | | NAKINA |
| 856 | RBCS | Colorado & Southern Ry. Co. | 4/1961-4/1970 | | NAKINA |
| 857 | RBCS | Colorado & Southern Ry. Co. | 4/61-4/70 | | NRHS |
| 858 | RBCS | The Colorado and Southern Ry. Co. | 1/75-1/80; eliminated 4/82 | | NRHS |
| 859 | RBCS | Burlington Northern R.R. Co. | added 4/82; 1/94 | | NRHS |
| 860 | RBCS | BNSF [BURLINGTON NORTHERN RAILROAD CO.; COLORADO & SOUTHERN RY.] | | | PWRC |
| 861 | RBCS | Rail-Bridge Corporation (BNSF Railway) | | | RSRV |
| 862 | RBCS | RELIANCE BULK CARRIERS LLC | | | SCAC4 |
| 863 | RBCU | RB HOLDING B.V. | | NL | BIC |
| 864 | RBCU | (PCBX) RAILBRIDGE CORPORATION | | | PWRC |
| 865 | RBCU | Rail-Bridge Corporation (RB Holding) | | | RSRV |
| 866 | RBCU | THE RAIL-BRIDGE CORP | | | SCAC3 |
| 867 | RBCU | RB HOLDING BV | | | SCAC4 |
| 868 | RBCX | The Rail-Bridge Corp. | added 10/1990; 1/1994; 7/2000-7/2005 (not listed) | | NAKINA |
| 869 | RBCX | The Rail-Bridge Corp. | added 10/90; 1/94-7/2000 | | NRHS |
| 870 | RBCX | RAIL-BRIDGE CORPORATION | | | PWRC |
| 871 | RBCX | Rail-Bridge Corporation | | | RSRV |
| 872 | RBCX | RAILBRIDGE CORPORATION | | | SCAC4 |
| 873 | RBCY | R & B COMPANY | | | SCAC3 |
| 874 | RBD | Trans World Express, Inc. | Callsign: Red Bird, | USA | AVCODES |
| 875 | RBD | CHC Helicopters Canada Inc | Callsign: Redbird, | CDN | AVCODES |
| 876 | RBD | Trans World Express | | | ICAO1 |
| 877 | RBDB | ROMBIS, DEBRA | | | SCAC4 |
| 878 | RBDC | RAIL-BRIDGE CORPORATION, THE | | | SCAC3 |
| 879 | RBDC | RBD EXPRESS INC | | | SCAC4 |
| 880 | RBDE | ROBIDEAUS EXPRESS | | | SCAC3 |
| 881 | RBDE | ROBARDS EXPRESS INC | | | SCAC4 |
| 882 | RBDI | REBEL DELIVERY SERVICE | | | SCAC3 |
| 883 | RBDL | ROBINSON, DON SAND AND GRAVEL INC | | | SCAC3 |
| 884 | RBDM | RUBY DOME INC | | | SCAC3 |
| 885 | RBDM | ROBICHAUD, D M ASSOCIATES LTD | | | SCAC4 |
| 886 | RBDP | ROBIDEAUX EXPRESS | | | SCAC4 |
| 887 | RBDQ | ROBERDEAU VAN & STORAGE | | | SCAC3 |
| 888 | RBDR | RBD TRANSPORT | | | SCAC4 |
| 889 | RBDS | ROBERTS DELIVERY SERVICE INC | | | SCAC3 |
| 890 | RBDS | RABAS, DAVE & SON INC | | | SCAC4 |
| 891 | RBDU | RABANCO COMPANIES | | | SCAC4 |
| 892 | RBDV | ROBERTS DELIVERIES | | | SCAC3 |
| 893 | RBDW | RBD EXPRESS TWO (2) LLC | | | SCAC4 |
| 894 | RBE | Redbus Executive Aviation | Callsign: Redbus, | GB | AVCODES |
| 895 | RBE | Air Rum Benin | Callsign: Rum Benin, | DY | AVCODES |
| 896 | RBE | Aur Rum Benin | | | ICAO1 |
| 897 | RBE | Rheinisch-Bergische-Eisenbahn GmbH | Mettmann (Connex-Gruppe > Veolia Verkehr) | D | privat-bahn.de |
| 898 | RBE | Rheinisch-Bergische Eisenbahn-Gesellschaft mbH | | DE | VKM |
| 899 | RBEA | R & B EXPRESS INC | | | SCAC4 |
| 900 | RBEC | R B EXPRESS INC | | | SCAC4 |
