| 17001 | CTQK | C & T TRUCKING OF FULTON INC | | | SCAC4 |
| 17002 | CTQL | C TRADE (USA) LTD | | | SCAC3 |
| 17003 | CTQL | CTL TRANSPORTATION LLC | | | SCAC4 |
| 17004 | CTQM | CONSOLIDATED TRAFFIC MANAGEMENT SER | | | SCAC3 |
| 17005 | CTQN | CALLAHAN TRANSPORTATION SERVICES IN | | | SCAC3 |
| 17006 | CTQN | COSHOCTON TRUCKING INC | | | SCAC4 |
| 17007 | CTQO | CONNOR TRANSPORT INC | | | SCAC3 |
| 17008 | CTQO | CEDAR TRANS | | | SCAC4 |
| 17009 | CTQP | CARTER TRANSPORT CO | | | SCAC3 |
| 17010 | CTQP | CARTER ENERGY CORPORATION | | | SCAC4 |
| 17011 | CTQQ | COONEY TRANSPORT QUEBEC INC | | | SCAC4 |
| 17012 | CTQR | CONTINENTAL TRANSPORTATION INC | | | SCAC3 |
| 17013 | CTQR | CARRERA TRANSPORT INC | | | SCAC4 |
| 17014 | CTQS | CATO INC | | | SCAC4 |
| 17015 | CTQT | CLASSIC TRANSPORTATION INC | | | SCAC3 |
| 17016 | CTQU | CTR INTERNATIONAL INC. | | CDN | BIC |
| 17017 | CTQV | CARRIER TRANSPORTATION SERVICES INC | | | SCAC3 |
| 17018 | CTQW | CASON TRANSPORT CO INC | | | SCAC3 |
| 17019 | CTQY | COTTAM OIL COMPANY INC | | | SCAC4 |
| 17020 | CTR | Aerolineas Centauro, S.A. de C.V. | Callsign: Centauro, | MEX | AVCODES |
| 17021 | CTR | Transport Air Centre | Callsign: Air centre, | F | AVCODES |
| 17022 | CTR | Aerlineas Centauro | | | ICAO1 |
| 17023 | CTR | Clinton Terminal R.R. Co. | 7/2000-7/2005 | | NAKINA |
| 17024 | CTR | Clinton Terminal R.R. Co. | Jul-00 | | NRHS |
| 17025 | CTR | CLINTON TERMINAL RAILROAD COMPANY | | | PWRC |
| 17026 | CTR | Clinton Terminal Railroad (Carlton Trail Railway) | | | RSRV |
| 17027 | CTR | CLINTON TERMINAL RAILROAD | | | SCAC4 |
| 17028 | CTR | Calgary Transit | | CDN | TRAFFIC |
| 17029 | CTRA | Connecticut Rail Systems, Inc. | added 10/1993; eliminated 1/1994; 1/1994 (not listed) | | NAKINA |
| 17030 | CTRA | Connecticut Rail Systems, Inc. | added 10/93; eliminated 1/94 | | NRHS |
| 17031 | CTRA | RETIRED 05-02-94 (202) ATP [CONNECTICUT RAIL SYSTEMS, INC.] | | | PWRC |
| 17032 | CTRB | CATTLE TRANSIT INC | | | SCAC3 |
| 17033 | CTRB | CECCHI TRANSPORT | | | SCAC4 |
| 17034 | CTRB | | City: Belfort | F | TRAFFIC |
| 17035 | CTRC | CHATTANOOGA TERMINAL RAILWAY COMPANY | | | PWRC |
| 17036 | CTRC | CHASON TRUCKING COMPANY INC | | | SCAC3 |
| 17037 | CTRC | CLEARSPRINGS TRANSPORTATION | | | SCAC4 |
| 17038 | CTRD | COLLINS TRANSPORT INC | | | SCAC3 |
| 17039 | CTRD | CHICAGO TRANSPORT | | | SCAC4 |
| 17040 | CTRE | CITY TRANSFER & STORAGE | | | SCAC3 |
| 17041 | CTRE | CURTIS TIRE SERVICE LTD | | | SCAC4 |
| 17042 | CTRF | COMMERCIAL TRANSFER, INC | | | SCAC3 |
| 17043 | CTRF | CAMPA TARAZON, RAFAEL | | | SCAC4 |
| 17044 | CTRH | CORNELIOS TRUCKING REFRIGERADOS SA | | | SCAC4 |
| 17045 | CTRI | CORONA TRANSPORT | | | SCAC4 |
| 17046 | CTRJ | CARR TRUCKING | | | SCAC4 |
| 17047 | CTRK | CARPENTER TRUCKING, INC | | | SCAC3 |
| 17048 | CTRL | CARROLLTON TRUCK LINE, INC | | | SCAC3 |
| 17049 | CTRL | CARIBBEAN TRANSPORT LINE (USA) INC | | | SCAC4 |
| 17050 | CTRL | Channel Tunnel Rail Link | | UK | VKM |
| 17051 | CTRM | CENTRAL MISSOURI RELOAD INC | | | SCAC3 |
| 17052 | CTRM | CENTRAL MISSOURI RELOAD INC | | | SCAC4 |
| 17053 | CTRN | Union Pacific Rd. Co. | added 4/2001; 7/2005 | | NAKINA |
| 17054 | CTRN | Central of Tennessee Ry. & Navigation Co. | added 4/1993; added 7/1993; 1/1994-7/2000; eliminated 4/2001 | | NAKINA |
| 17055 | CTRN | Central of Tennessee Ry. & Navigation Co. | added 4/93; added 7/93; 1/94-7/2000; eliminated 4/2001 | | NRHS |
| 17056 | CTRN | Union Pacific Rd. Co. | added 4/2001 | | NRHS |
| 17057 | CTRN | UNION PACIFIC [CENTRAL OF TENNESSEE RAILWAY & NAVIGATION CO., INC.] | | | PWRC |
| 17058 | CTRN | Central of Tennessee Railway | | | RSRV |
| 17059 | CTRN | CONTRANS GMBH | | | SCAC3 |
| 17060 | CTRN | CONTRANS GMBH | | | SCAC4 |
| 17061 | CTRN | Central of Tennessee Ry. & Navigation Co. | | USA | TRAFFIC |
| 17062 | CTRO | CLINTONS TRANSFER & STORAGE INC | | | SCAC3 |
| 17063 | CTRQ | CONTRACT FREIGHTERS, INC. | | | SCAC3 |
| 17064 | CTRQ | CONTRACT FREIGHTERS, INC | | | SCAC4 |
| 17065 | CTRR | Cloquet Terminal R.R. Co., Inc. | added 10/2003; 7/2005 | | NAKINA |
| 17066 | CTRR | CLOQUET TERMINAL RAILROAD | | | PWRC |
| 17067 | CTRR | Cloquet Terminal Railroad | | | RSRV |
| 17068 | CTRR | CONTRACT PIPE CARRIERS, INC | | | SCAC3 |
| 17069 | CTRR | CLOQUET TERMINAL RAILROAD COMPANY I | | | SCAC4 |
| 17070 | CTRS | COASTAL TRANSPORT SERVICES INC | | | SCAC4 |
| 17071 | CTRT | CONTAINER TRANSPORT LLC | | | SCAC4 |
| 17072 | CTRU | H.ESSERS TRANSPORT COMPANY NEDERLAND BV | | NL | BIC |
| 17073 | CTRU | CONTAINER TRADING CO. | | | PWRC |
| 17074 | CTRU | Container Trading | | | RSRV |
| 17075 | CTRU | CENTRUM TRANSPORT BV | | | SCAC4 |
| 17076 | CTRV | CONTRACTORS HAULING SERVICE, INC | | | SCAC3 |
| 17077 | CTRW | Carlton Trail Ry. Co. | added 4/1998; 7/2000-7/2005 | | NAKINA |
| 17078 | CTRW | Carlton Trail Ry. Co. | added 4/98; 7/2000 | | NRHS |
| 17079 | CTRW | CARLTON TRAIL RAILWAY COMPANY | | | PWRC |
| 17080 | CTRW | Carlton Trail Railway | | | RSRV |
| 17081 | CTRW | CARLTON TRAIL RAILWAY COMPANY | | | SCAC4 |
| 17082 | CTRX | Cargill Inc. | added 10/2004; 7/2005 | | NAKINA |
| 17083 | CTRX | C&T Refinery, LLC | added 1/2000; 7/2000; eliminated 10/2004 | | NAKINA |
| 17084 | CTRX | C&T Refinery, Inc. | added 7/1983; 1/1994; eliminated 1/2000 | | NAKINA |
| 17085 | CTRX | Continental Turpentine & Rosin Corp. | added 7/1957; 10/1957-10/1966; eliminated 4/1967 | | NAKINA |
| 17086 | CTRX | Chemical Transit Co. | added 1/1953; 7/1954; eliminated 4/1955 | | NAKINA |
| 17087 | CTRX | Chemical Transit Co. | added 1/53; eliminated 4/55 | | NRHS |
| 17088 | CTRX | Continental Turpentine & Rosin Corp. | 10/57-10/66; eliminated 4/67 | | NRHS |
| 17089 | CTRX | C&T Refinery, Inc. | 1/94; eliminated 1/2000 | | NRHS |
| 17090 | CTRX | C&T Refinery, LLC | added 1/2000; 7/2000 | | NRHS |
| 17091 | CTRX | CARGILL, INC. [C & T REFINERY, INC.; CHAPERAL & TEXAS RAILROAD] | | | PWRC |
| 17092 | CTRX | C and T Refinery | | | RSRV |
| 17093 | CTRX | CONTINENTAL TURPENTINE & ROSIN CORP | | | SCAC3 |
| 17094 | CTRX | CARGILL INC | | | SCAC4 |
| 17095 | CTRY | CATUCCI, TROY LINE INC. | | | SCAC3 |
| 17096 | CTRY | CATES TRUCKING | | | SCAC4 |
| 17097 | CTS | Center-South Ltd. | Callsign: Center-South, | RUS | AVCODES |
| 17098 | CTS | Charters Ejecutivos S.A. de C.V. | Callsign: Executive, | MEX | AVCODES |
| 17099 | CTS | Center-South | | | ICAO1 |
| 17100 | CTS | | City: Strassbourg | F | TRAFFIC |
