| 1 | CRI | Consorcio Aereo, S.A. de C.V. | Callsign: Consorico, | MEX | AVCODES |
| 2 | CRI | Cirrus Airlines Pty Ltd. | | AUS | AVCODES |
| 3 | CRI | Crown Air, S.A. de C.V. | Callsign: Croair, | MEX | AVCODES |
| 4 | CRI | Chicago River & Indiana R.R. Co. | 7/1923 & 10/1966 | | NAKINA |
| 5 | CRI | Consolidated Rail Corp. | added 4/1976; 1/1980; eliminated 1/1983; 1/1994 | | NAKINA |
| 6 | CRI | Chicago River & Indiana R.R. | 4/1938-7/1965 & 1/1975; eliminated 4/1976 | | NAKINA |
| 7 | CRI | Chicago River & Indiana R.R. Co. | 8/1920 & 7/1930-7/1936 | | NAKINA |
| 8 | CRI | Chicago River & Indiana R.R. Co. | 7/23 & 10/66 | | NRHS |
| 9 | CRI | Chicago River & Indiana R.R. | 4/38-7/65 & 1/75; eliminated 4/76 | | NRHS |
| 10 | CRI | Consolidated Rail Corp. | added 4/76; 1/80; eliminated 1/83; 1/94 | | NRHS |
| 11 | CRI | CONSOLIDATED RAIL CORP. [CHICAGO RIVER & INDIANA RR] | | | PWRC |
| 12 | CRI | Chicago River & Indiana | | USA | TRAFFIC |
| 13 | CRI&P | CHICAGO ROCK ISLAND & PACIFIC RAILROAD | | | PWRC |
| 14 | CRIB | CARIBE PACIFIC CARRIERS INC | | | SCAC3 |
| 15 | CRIB | CRTR INC | | | SCAC4 |
| 16 | CRIC | CARMIL INC | | | SCAC3 |
| 17 | CRID | CARRI INCORPORATED | | | SCAC3 |
| 18 | CRID | CATSKILL EXPRESS LLC | | | SCAC4 |
| 19 | CRIE | CONREP | | | SCAC4 |
| 20 | CRIF | CRUCES INTERNACIONALES FALCON SA DE | | | SCAC4 |
| 21 | CRIG | CRAIG MOVERS INC | | | SCAC3 |
| 22 | CRIG | CRAIG MOVERS INC | | | SCAC4 |
| 23 | CRII | CENTRAL RIGGING & TRUCKING CO INC | | | SCAC3 |
| 24 | CRIJ | Carolina Rail Services, Co. | added 4/1987; eliminated 1/1990; 1/1994-7/2005 | | NAKINA |
| 25 | CRIJ | Carolina Rail Services, Co. | added 4/87; eliminated 1/90; 1/94-7/2000 | | NRHS |
| 26 | CRIJ | CAROLINA RAIL SERVICES, LLC | | | PWRC |
| 27 | CRIJ | Carolina Rail Services | | | RSRV |
| 28 | CRIJ | CAROLINA RAIL SERVICES INC | | | SCAC3 |
| 29 | CRIK | CREST INTERSTATE TRUCKING CO | | | SCAC3 |
| 30 | CRIL | CARGO INTERNATIONAL | | | SCAC3 |
| 31 | CRIM | CRIMBLY TRUCKING SERVICE, INC | | | SCAC3 |
| 32 | CRIN | CHRIN BROS | | | SCAC3 |
| 33 | CRIN | CRISPI, M INTERNATIONAL LTD | | | SCAC4 |
| 34 | CRIO | CRITES OIL CO | | | SCAC3 |
| 35 | CRIP | CHICAGO ROCK ISLAND & PACIFIC RR | | | PWRC |
| 36 | CRIP | CHICAGO, ROCK ISLAND & PACIFIC | | | SCAC3 |
| 37 | CRIP | CLARK & REID COMPANY INC | | | SCAC4 |
| 38 | CRIP | Chicago, Rock Island & Pacific Railroad | | USA | TRAFFIC |
| 39 | CRIQ | CRAIG ENTERPRISES | | | SCAC3 |
| 40 | CRIQ | CARTER, CHARLES H & SON INC | | | SCAC4 |
| 41 | CRIR | CRUISE INTERMODAL CORPORATION | | | SCAC3 |
| 42 | CRIR | CRUISE INTERMODAL CORPORATION | | | SCAC4 |
| 43 | CRIT | CRITES TRANSFER INC | | | SCAC3 |
| 44 | CRIU | CRAY RESEARCH INC. | | | SCAC3 |
| 45 | CRIV | CASTLEMAN RIVER RR | | | PWRC |
| 46 | CRIV | CROSSRIVER INDUSTRIES INC | | | SCAC3 |
| 47 | CRIV | CROSSRIVER INDUSTRIES INC | | | SCAC4 |
| 48 | CRIW | CRIST, WILLIAM | | | SCAC3 |
| 49 | CRIW | CARRIER TRUCK CENTRE | | | SCAC4 |
| 50 | CRIX | Citicorp Railmark, Inc. | added 7/1990; 1/1994-7/2005 | | NAKINA |
| 51 | CRIX | General Electric Railcar Services Corp. | added 1/1984; eliminated 7/1986 | | NAKINA |
| 52 | CRIX | North American Car Corp. | added 1/1961; 4/1961-1/1980; eliminated 1/1984 | | NAKINA |
| 53 | CRIX | North Western Refrigerator Line Division North American Car Corp. | added 10/1958; eliminated 1/1961 | | NAKINA |
| 54 | CRIX | North Western Refrigerator Line Co., a Division North American Car Corp. | added 4/1958; eliminated 10/1958 | | NAKINA |
| 55 | CRIX | Cherry River Extract Co. (Armour Car Lines) | 7/1923 | | NAKINA |
| 56 | CRIX | North Western Refrigerator Line Co., a Division North American Car Corp. | eliminated 10/58 | | NRHS |
| 57 | CRIX | North Western Refrigerator Line Division North American Car Corp. | added 10/58; 4/61 | | NRHS |
| 58 | CRIX | North American Car Corp. | 7/65-1/80 | | NRHS |
| 59 | CRIX | General Electric Railcar Services Corp. | eliminated 7/86 | | NRHS |
| 60 | CRIX | Citicorp Railmark, Inc. | added 7/90; 1/94-7/2000 | | NRHS |
| 61 | CRIX | *CHERRY RIVER EXTRACT CO. (ARMOUR CAR LINES) | | | PWRC |
| 62 | CRIX | *CITY OF RICHMOND INDIANA | | | PWRC |
| 63 | CRIX | +CITICORP RAILMARK, INC.{GE RAILCAR SERVICES CORP.; NORTH AMERICAN CAR CORP.] | | | PWRC |
| 64 | CRIX | Citicorp Railmark | | | RSRV |
| 65 | CRIX | CITICORP RAILMARK, INC. | | | SCAC4 |
| 66 | CRIX | Citicorp Railmark, Inc. | | USA | TRAFFIC |
