| 12101 | BUDI | BUDS SALADS | | | SCAC4 |
| 12102 | BUDJ | BUTLER, DALE | | | SCAC3 |
| 12103 | BUDK | BUNDAY, GARY TRUCKING | | | SCAC3 |
| 12104 | BUDL | BUDREAU, LARRY TRUCKING | | | SCAC4 |
| 12105 | BUDM | BUDMAR TRANSPORT INC | | | SCAC4 |
| 12106 | BUDN | BUDS SERVICE CENTER LTD | | | SCAC3 |
| 12107 | BUDO | BUDDYS DELIVERY SERVICE | | | SCAC3 |
| 12108 | BUDP | BUDS MOVING & STORAGE INC | | | SCAC3 |
| 12109 | BUDQ | BUDS SERVICE & TRANSFER | | | SCAC3 |
| 12110 | BUDR | BURNS, F J DRAYING | | | SCAC3 |
| 12111 | BUDS | BURLESON DISTRIBUTOR | | | SCAC3 |
| 12112 | BUDS | BURLESON DISTRIBUTORS INC | | | SCAC4 |
| 12113 | BUDT | BUDRECK TRUCK LINES INC | | | SCAC3 |
| 12114 | BUDT | BUDRECK TRUCK LINES INC | | | SCAC4 |
| 12115 | BUDU | CAMECO CORPORATION | | CDN | BIC |
| 12116 | BUDU | BUDGET CONTAINER INC | | | SCAC3 |
| 12117 | BUDU | BUDGET CONTAINER INC | | | SCAC4 |
| 12118 | BUDV | BUDGET ENVIRONMENTAL DISPOSAL | | | SCAC4 |
| 12119 | BUDW | BUDWAY EXPRESS | | | SCAC3 |
| 12120 | BUDW | BUDWAY EXPRESS | | | SCAC4 |
| 12121 | BUDX | The Budd Co. (temporary) | 1/1994-7/2005 (not listed) | | NAKINA |
| 12122 | BUDX | American Refrigerator Transit Co. | 10/1966; eliminated 10/1967 | | NAKINA |
| 12123 | BUDX | American Refrigerator Transit Co. | 10/66; eliminated 10/67 | | NRHS |
| 12124 | BUDX | The Budd Co. (temporary) | 1/94-7/2000 | | NRHS |
| 12125 | BUDX | *AMERICAN REFRIGERATOR TRANSIT CO. (ELIMINATED 10/1967) | | | PWRC |
| 12126 | BUDX | +BUDD COMPANY (TEMPORARY AS OF 2008) | | | PWRC |
| 12127 | BUDX | Budd | | | RSRV |
| 12128 | BUDZ | *BUD ANTLE INC | | | PWRC |
| 12129 | BUDZ | *BUDD COMPANY | | | PWRC |
| 12130 | BUDZ | Bud Antle | | | RSRV |
| 12131 | BUDZ | BUD ANTLE, INC. | | | SCAC3 |
| 12132 | BUDZ | BUD ANTLE INC | | | SCAC4 |
| 12133 | BUE | Orebro Aviation AB | Callsign: Bue, ICAO callsign changed from Blueflite | S | AVCODES |
| 12134 | BUE | Orebro Aviation | | | ICAO1 |
| 12135 | BUEA | BUEHLER MOVING & STORAGE CO | | | SCAC3 |
| 12136 | BUEA | BUEHLER MOVING & STORAGE CO | | | SCAC4 |
| 12137 | BUEB | BRUCE BROS TRUCKING | | | SCAC3 |
| 12138 | BUEE | BLUE EAGLE TRUCKING LLC | | | SCAC4 |
| 12139 | BUEF | BURLINGHAM, E F & SONS | | | SCAC3 |
| 12140 | BUEI | BURRELL TRUCKING INC | | | SCAC3 |
| 12141 | BUEK | BUNDY, E K TRUCKING | | | SCAC3 |
| 12142 | BUEN | BURKE INC | | | SCAC4 |
| 12143 | BUEO | BUENA PARK TRANSFER & STORAGE INC | | | SCAC3 |
| 12144 | BUEO | BUECHLER OIL CO INC | | | SCAC4 |
| 12145 | BUEP | BUCK EXPRESS | | | SCAC3 |
| 12146 | BUEP | BROOKFIELD UNION ENTERPRISES LLC | | | SCAC4 |
| 12147 | BUEQ | BRUCE TRANSFER & STORAGE DIVISION | | | SCAC3 |
| 12148 | BUES | BLUE STAR TRANSPORTATION INC | | | SCAC4 |
| 12149 | BUET | BURISH, ELTON TRUCKING INC | | | SCAC3 |
| 12150 | BUET | BLUE TRANS LOGISTICS INC | | | SCAC4 |
| 12151 | BUEV | BUEANA VISTA TRUCKING INC | | | SCAC3 |
| 12152 | BUEW | BURGESS, EARL W TRUCKING CO | | | SCAC3 |
| 12153 | BUEW | BURGESS TRUCKING COMPANY INC | | | SCAC4 |
| 12154 | BUEY | BUELL, DENNY TRUCKING | | | SCAC3 |
| 12155 | BUF | Buff Air Services | Callsign: Speedhawk, | EAK | AVCODES |
| 12156 | BUFA | BUFFALO HORSE TRANSPORT, INC | | | SCAC3 |
| 12157 | BUFB | Buffalo Bus of Flitwick | | GB | TRAFFIC |
| 12158 | BUFC | BUFFALO EXPRESS COURIER INC | | | SCAC4 |
| 12159 | BUFD | BURRIS FOOD DISTRIBUTORS INC | | | SCAC3 |
| 12160 | BUFE | BEAULAR, FEDERICK DEAN | | | SCAC3 |
| 12161 | BUFH | BURNFIELD TRUCKING | | | SCAC3 |
| 12162 | BUFI | BUFFALO FUEL CORP | | | SCAC3 |
| 12163 | BUFI | BUFFALO FUEL CORP | | | SCAC4 |
| 12164 | BUFL | BUFFALO SERVICES INC | | | SCAC4 |
| 12165 | BUFM | BUSS MOVING & STORAGE | | | SCAC3 |
| 12166 | BUFN | BULK FEED TRANSPORT | | | SCAC3 |
| 12167 | BUFO | BUFFALO SUBURBAN CARTING | | | SCAC3 |
| 12168 | BUFP | BAUER FREIGHT INC | | | SCAC3 |
| 12169 | BUFQ | BUFFALO CONSOLIDATED CARTAGE INC | | | SCAC3 |
| 12170 | BUFR | BUFFALO TRANSPORT COMPANY INC | | | SCAC4 |
| 12171 | BUFS | BUCKLEY FREIGHT SYSTEM INC | | | SCAC3 |
| 12172 | BUFS | BULLET FREI | | | SCAC4 |
| 12173 | BUFT | BUCKLEY FREIGHT OF CALIFORNIA INC | | | SCAC3 |
| 12174 | BUFU | BUFFALO LINE | | | SCAC3 |
| 12175 | BUFW | BUFFALO WOOD INC | | | SCAC3 |
| 12176 | BUG | Mokulele Flight Service, Inc. | IATA: MW, Callsign: Speedbuggy, IATA Prefix: 415, ICAO designator changed to MUL. ICAO callsign changed to Mokulele. IATA designator changed from 5Z* | USA | AVCODES |
| 12177 | BUG | Innovation First Transportation, Inc. | Callsign: Hexbug, | USA | AVCODES |
| 12178 | BUG | Mokulele Airlines | | | ICAO1 |
| 12179 | BUG | BUG Verkehrsbau AG | Berlin (BUG = Bau u. Unterhaltung von Gleisanlagen) | D | privat-bahn.de |
| 12180 | BUG | BUG Verkehrsbau AG | This new track maintenance company originates from the company Bau und Unterhaltung von Gleisanlagen (BUG), founded in 1990. It is based in Berlin. As BUG is not yet registered as an operator, the stock is actually in service for OHE-Sp. | D | TRAFFIC |
| 12181 | BUG | BUG Vermietungsgesellschaft mbH | | DE | VKM |
| 12182 | BUGA | BAUER, G A TRUCKING | | | SCAC3 |
| 12183 | BUGC | BURNS BEVERAGE CO | | | SCAC3 |
| 12184 | BUGD | BUTCHART GARDENS LTD, THE | | | SCAC4 |
| 12185 | BUGE | BURGESS TRANSPORTATION | | | SCAC3 |
| 12186 | BUGE | BURGESS TRANSPORTATION | | | SCAC4 |
| 12187 | BUGG | N R BUGGE | | | SCAC3 |
| 12188 | BUGG | BROADCAST UNIFYING GEARS (BUG TV) I | | | SCAC4 |
| 12189 | BUGH | BURGHART | | | SCAC3 |
| 12190 | BUGK | BLUEGRASS TRUCKING | | | SCAC3 |
| 12191 | BUGL | BURGUNDY LIMOUSINE INC | | | SCAC3 |
| 12192 | BUGL | BUG LOGISTICS | | | SCAC4 |
| 12193 | BUGM | BRUGGER & MCDOWELL INC | | | SCAC3 |
| 12194 | BUGN | BUGARIN, M TRUCKING INC | | | SCAC4 |
| 12195 | BUGO | BUSH, GEO S & CO INC AN OREGON CORP | | | SCAC3 |
| 12196 | BUGO | BUSH, GEO S & CO INC AN OREGON CORP | | | SCAC4 |
| 12197 | BUGP | BUDGET TRANSPORT INC | | | SCAC3 |
| 12198 | BUGR | BUDGET RENT A CAR OF WILMINGTON NC | | | SCAC3 |
| 12199 | BUGS | BUGLE SHIPPING COMPANY LIMITED | | | SCAC4 |
| 12200 | BUGT | BUGS TRUCKING INC | | | SCAC4 |
