| 1 | CAR | Inter RCA | Callsign: Quebec Romeo, | RCA | AVCODES |
| 2 | CAR | Inter RCA | | | ICAO1 |
| 3 | CAR | CARDINAL BUSES INC | | | SCAC4 |
| 4 | CAR | Cardiff Railway Company Ltd. | Real: CA, 1999: 138km standard gauge, not electrified | GB | TRAFFIC |
| 5 | CAR | CARBO Kohlensäurewerk Hannover GmbH | | DE | VKM |
| 6 | CARB | CAROLINE STREET TRUCKING | | | SCAC3 |
| 7 | CARB | CARBOFIN S P A | | | SCAC4 |
| 8 | CARBA | Carbagas | | CH | VKM |
| 9 | CARBO | „CARBO” Holding Sp. z o.o. | | PL | VKM |
| 10 | CARBON | Georges Carbon | | L | TRAFFIC |
| 11 | CARC | CARGOTRANS | | | SCAC4 |
| 12 | CARD | CARDINALE TRUCKING CORP | | | PWRC |
| 13 | CARD | CARDIFF MARINE INC | | | SCAC4 |
| 14 | CARD | Cardinal Coach Lines | | CDN | TRAFFIC |
| 15 | CARDP | Cardinale sas S.A.S. Noleggio Pullman Minibus Pescara | | I | TRAFFIC |
| 16 | CARE | CARRERA TRUCKING | | | SCAC3 |
| 17 | CAREF | Carefree Bus Tours, NJ | | USA | TRAFFIC |
| 18 | CAREY | Carey Airport Express | City: New York | US-NY | TRAFFIC |
| 19 | CARF | CAREFUL MOVING CO | | | SCAC3 |
| 20 | CARG | CARGO TRANSIT INC | | | SCAC4 |
| 21 | CARGO | Cargo Service GmbH | | AT | VKM |
| 22 | CARH | CAL RENTAL TOOL & SUPPLY INC | | | SCAC3 |
| 23 | CARI | CARR TRANSPORT INC | | | SCAC3 |
| 24 | CARI | CARE-FLO CARRIERS | | | SCAC4 |
| 25 | CARJ | CARAVAN MOVERS | | | SCAC3 |
| 26 | CARL | CARROLL BROS. EXPRESS, INC | | | SCAC3 |
| 27 | CARM | COSTA AMATORI S.P.A. | | | PWRC |
| 28 | CARM | CASTRO ANGULO. ROMELIA | | | SCAC4 |
| 29 | CARN | CARPENTER TRUCKING COMPANY INC | | | SCAC3 |
| 30 | CARO | CASSARO, ANGELO | | | SCAC3 |
| 31 | CARO | CARSONS TRANSPORT | | | SCAC4 |
| 32 | CARP | CARROLL CONTRETE CO INC | | | SCAC4 |
| 33 | CARQ | CARY TRANSFER CORPORATION, THE | | | SCAC3 |
| 34 | CARR | The Carrollton R.R. | 1/1975-1/1994; eliminated 4/1996; 7/2000-7/2005 | | NAKINA |
| 35 | CARR | The Carrollton R.R. | 1/75-1/94; eliminated 4/96; 7/2000 | | NRHS |
| 36 | CARR | CSX TRANSPORTATION (CARROLLTON RAILROAD) | | | PWRC |
| 37 | CARR | Carrollton Railroad | | | RSRV |
| 38 | CARR | CARROLLTON RAILROAD | | | SCAC3 |
| 39 | CARR | CARROLLTON RAILROAD | | | SCAC4 |
| 40 | CARS | CARTERS COACH INC | | | SCAC3 |
| 41 | CART | CARATAL COMPANY S A | | | SCAC3 |
| 42 | CARU | CARU CONTAINERS BV | | NL | BIC |
| 43 | CARU | RETIRED 06-30-93 ATP | | | PWRC |
| 44 | CARU | CAROLINA FREIGHT CARRIERS | | | SCAC3 |
| 45 | CARU | CONTAINER ASSOCIATION ROTTERDAM BV | | | SCAC4 |
| 46 | CARV | CARAVELLE MOVING & STORAGE INC | | | SCAC4 |
| 47 | CARW | Carolina Western | 1/1975 | | NAKINA |
| 48 | CARW | Carolina Western | Jan-75 | | NRHS |
| 49 | CARW | CAROLINA WESTERN RAILROAD | | | PWRC |
| 50 | CARX | Lamson & Sessions | added 1/1995; eliminated 1/1999; 7/2000 (not listed) | | NAKINA |
| 51 | CARX | Carlon | added 7/1984; 1/1994; eliminated 1/1995 | | NAKINA |
| 52 | CARX | Carlon, an Indian Head Co. | added 10/1977; 1/1980; eliminated 7/1984 | | NAKINA |
| 53 | CARX | Carlon Division, Indian Head, Inc. | added 10/1972; 1/1975; eliminated 10/1977 | | NAKINA |
| 54 | CARX | Cargo Carriers Inc. | added 7/1955; 10/1957-7/1965; eliminated 10/1965 | | NAKINA |
| 55 | CARX | Cargo Carriers Inc. | added 7/55; 10/57-7/65; eliminated 10/65 | | NRHS |
| 56 | CARX | Carlon Division, Indian Head, Inc. | added 10/72; 1/75 | | NRHS |
| 57 | CARX | Carlon, an Indian Head Co. | 1/80; eliminated 7/84 | | NRHS |
| 58 | CARX | Carlon | added 7/84; 1/94; eliminated 1/95 | | NRHS |
| 59 | CARX | Lamson & Sessions | added 1/95; eliminated 1/99; 7/2000 | | NRHS |
| 60 | CARX | *CANADIAN ATLANTIC RAILROAD (OUT OF EXISTENCE) | | | PWRC |
| 61 | CARX | *CARGO CARRIERS, INC. | | | PWRC |
| 62 | CARX | *LAMSON AND SESSIONS [CARLON INC.DIV. INDIAN HEAD CO.] | | | PWRC |
| 63 | CARX | +CALIBER AUTO TRANSFER | | | PWRC |
| 64 | CARX | Cargo Carriers (Lamson and Sessions) | | | RSRV |
| 65 | CARX | CALIBER AUTO TRANSFER | | | SCAC4 |
| 66 | CARY | CARUFEL REFRIGERATED SERVICES INC | | | SCAC3 |
| 67 | CARZ | *ANTON CARATON & SON | | | PWRC |
| 68 | CARZ | *CARGILL GRAIN | | | PWRC |
| 69 | CARZ | Anton Caraton and Son | | | RSRV |
