| 1 | TCS | Transportes de Carga Aerea Especializada Y Servicios Aeronauticos | Callsign: Transcaesa, | MEX | AVCODES |
| 2 | TCS | ATS, Private Company | Callsign: Techservice, | UA | AVCODES |
| 3 | TCS | Transport- und Cargoservice GmbH | Hamburg | D | privat-bahn.de |
| 4 | TCS | TACOMA SMELTER | | | PWRC |
| 5 | TCS | TRANSPORTATION CONSULTING & | | | SCAC4 |
| 6 | TCSA | TWIN CITY SHIPPERS ASSOCIATION INC | | | SCAC3 |
| 7 | TCSA | TRANSPORTES CARRASCO | | | SCAC4 |
| 8 | TCSBV | Train Charter Services B.V. | Real: TCS | NL | TRAFFIC |
| 9 | TCSD | TRANS-CONSOLIDATED INC | | | SCAC3 |
| 10 | TCSE | THREE C'S EXPRESS INC | | | SCAC4 |
| 11 | TCSF | TCSI-TRANSLAND INC | | | SCAC4 |
| 12 | TCSG | TERRA COTTA SHIPPING LTD | | | SCAC3 |
| 13 | TCSG | TRANSPORTES CARRASCO SA DE CV | | | SCAC4 |
| 14 | TCSH | TRANS COASTAL SERVICES INC | | | SCAC3 |
| 15 | TCSI | TRI-COUNTY SUPPLY INC | | | SCAC3 |
| 16 | TCSI | TRI-COUNTY SUPPLY INC | | | SCAC4 |
| 17 | TCSJ | T C S DISTRIBUTION INC | | | SCAC4 |
| 18 | TCSL | TRICOASTAL TRANSPORT LTD | | | SCAC3 |
| 19 | TCSN | TIMS CASINO EXPRESS INC | | | SCAC3 |
| 20 | TCSN | T C AND SONS TRUCKING LLC | | | SCAC4 |
| 21 | TCSR | (TCSZ) TRIPLE CROWN SERVICES INC. | | | PWRC |
| 22 | TCSR | TRIPLE CROWN SERVICES INC | | | SCAC3 |
| 23 | TCSR | TRIPLE CROWN SERVICES COMPANY | | | SCAC4 |
| 24 | TCST | T C S T | | | SCAC3 |
| 25 | TCSU | TANKCON B.V | | NL | BIC |
| 26 | TCSU | TRANSCONTAINER SERVICE | | | SCAC3 |
| 27 | TCSU | TRANSCONTAINER SERVICE | | | SCAC4 |
| 28 | TCSV | TRANS-CHEM SERVICES INC | | | SCAC4 |
| 29 | TCSW | TACOMA & SEATTLE TRAILER REPAIR INC | | | SCAC3 |
| 30 | TCSW | TACOMA & SEATTLE TRAILER REPAIR INC | | | SCAC4 |
| 31 | TCSX | Transcontinental Systems, Inc. | 4/1970 | | NAKINA |
| 32 | TCSX | Tank Car Services, Inc. | added 1/1980; 1/1980; eliminated 1/1986 | | NAKINA |
| 33 | TCSX | Transcontinental Systems, Inc. | Apr-70 | | NRHS |
| 34 | TCSX | Tank Car Services, Inc. | added 1/80; 1/80; eliminated 1/86 | | NRHS |
| 35 | TCSX | *TRANSCONTINENTAL SYSTEMS, INC. | | | PWRC |
| 36 | TCSX | *TANK CAR SERVICES, INC. | | | PWRC |
| 37 | TCSX | *TRINITY INDUSTRIES [TRANCISCO RAIL SERVICES CO.} | | | PWRC |
| 38 | TCSX | Tank Car Services | | | RSRV |
| 39 | TCSX | TEXAS CRUSHED STONE COMPANY | | | SCAC4 |
| 40 | TCSY | TRANS-CONTINENTAL SYSTEM INC | | | SCAC3 |
| 41 | TCSY | TRANS-CONTINENTAL SYSTEMS INC | | | SCAC4 |
| 42 | TCSZ | *TRANSPORTATION CERTIFICATION SERVICES, INC. | | | PWRC |
| 43 | TCSZ | *TRIPLE CROWN SERVICES COMPANY | | | PWRC |
| 44 | TCSZ | Triple Crown Service | | | RSRV |
| 45 | TCSZ | TRIPLE CROWN SERVICES INC | | | SCAC4 |
| 46 | TCSZ | Triple Crown Services Company | | USA | TRAFFIC |
