| 1 | TTV | T-air Spol s.r.o. | Callsign: Winsky, Part of TTV Group. | CZ | AVCODES |
| 2 | TTVD | TIAN TIAN FOOD SERVICE | | | SCAC4 |
| 3 | TTVE | TRANSPORT TWO FOUR SEVEN (247) INDU | | | SCAC4 |
| 4 | TTVF | TS TRANSPORTATION INC | | | SCAC4 |
| 5 | TTVI | TRANSPORT VIA | | | SCAC4 |
| 6 | TTVJ | TRANSPORTES TFC | | | SCAC4 |
| 7 | TTVJ | Tinglev-Tonder Veteran Jernbane | | DK | TRAFFIC |
| 8 | TTVL | TEN THOUSAND VILLAGES | | | SCAC4 |
| 9 | TTVQ | TROYER TRUCKING INC | | | SCAC4 |
| 10 | TTVS | TRINITY TRANSPORTATION SERVICES INC | | | SCAC4 |
| 11 | TTVT | TRANSPORTADORA TREDA SA DE CV | | | SCAC4 |
| 12 | TTVV | TOPSPEED TRANS | | | SCAC4 |
| 13 | TTVW | THAMMA TRANSPORT | | | SCAC4 |
| 14 | TTVX | Trailer Train Co. | 1/1975-1/1980; eliminated 1/1992 | | NAKINA |
| 15 | TTVX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 16 | TTVX | Trailer Train Co. (flat cars equipped with Vert-A-Pak superstructure, furnished by participant railroads) | 1/1975-1/1980 | | NAKINA |
| 17 | TTVX | Trailer Train Co./TTX Co. (flat cars, equipped with tri-level auto racks without end doors and with or without roof panels) | 7/1985-1/1994 | | NAKINA |
| 18 | TTVX | Trailer Train Co. | | | NRHS |
| 19 | TTVX | Trailer Train Co. (flat cars equipped with Vert-A-Pak superstructure, furnished by participant railroads) | 1/75-1/80 | | NRHS |
| 20 | TTVX | Trailer Train Co. | eliminated 1/92 | | NRHS |
| 21 | TTVX | TTX Co. | added 1/92; 1/94 | | NRHS |
| 22 | TTVX | TTX COMPANY {TRAILER TRAIN COMPANY} | | | PWRC |
| 23 | TTVX | Trailer Train (TTX Corporation) | | | RSRV |
| 24 | TTVX | TTX COMPANY | | | SCAC4 |
