| 1 | TTB | Aerolineas Turisticas Del Caribe, S.A. de C.V. | Callsign: Aero Turisticas, | MEX | AVCODES |
| 2 | TTB | Aerolineas Turisticas del Caribe | | | ICAO1 |
| 3 | TTBA | TOMKEN TRANSPORTATION (BROKERAGE DI | | | SCAC4 |
| 4 | TTBB | TRI-CONTINENTAL TRUCK BROKERAGE INC | | | SCAC4 |
| 5 | TTBE | TETI BAKERY INC | | | SCAC4 |
| 6 | TTBF | TEPA TRUCKING | | | SCAC4 |
| 7 | TTBG | TTT BROKERAGE LLC | | | SCAC4 |
| 8 | TTBH | TRANSPORTES TRR SA DE CV | | | SCAC4 |
| 9 | TTBI | TRANSPORT BOUTET INC | | | SCAC4 |
| 10 | TTBK | TRIPLE T TRUCK BROKERS INC | | | SCAC4 |
| 11 | TTBL | T T BAIT LIMITED | | | SCAC4 |
| 12 | TTBO | TRANSPORT TRANSBO INC | | | SCAC4 |
| 13 | TTBP | TRINIDAD AND TOBAGO PETROLEUM | | | SCAC1 |
| 14 | TTBR | TRANSPORTES BARRERA | | | SCAC4 |
| 15 | TTBS | TANNER TRUCKING & BIT SERVICE LTD | | | SCAC4 |
| 16 | TTBT | TEDS TRUCK BODY & TRAILER SERVICE I | | | SCAC4 |
| 17 | TTBU | EQUIPPED4U BV | | NL | BIC |
| 18 | TTBV | TC TRANSPORT INC | | | SCAC4 |
| 19 | TTBW | TOMITAS TRUCKING INC | | | SCAC4 |
| 20 | TTBX | Trailer Train Co. | added 4/1968; 10/1968-1/1980; eliminated 1/1992 | | NAKINA |
| 21 | TTBX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 22 | TTBX | Trailer Train Co. | added 4/1968 | | NAKINA |
| 23 | TTBX | Trailer Train Co. (89'3"" and over FA flats equipped with bi-level automobile carrying superstructures furnished by member railroads. Cars are not equipped with hitches and bridge plates. Equipped with hydraulic draft gear) | 10/1968 | | NAKINA |
| 24 | TTBX | Trailer Train Co. (flat cars, length 89'4"" or over, equipped with bi-level auto racks furnished by member railroads) | 4/1970 | | NAKINA |
| 25 | TTBX | Trailer Train Co./TTX Co. (flat cars equipped with bi-level auto racks furnished by participant railroads) | 1/1975-7/2000 | | NAKINA |
| 26 | TTBX | Trailer Train Co. | added 4/68 | | NRHS |
| 27 | TTBX | Trailer Train Co. (89'3" and over FA flats equipped with bi-level automobile carrying superstructures furnished by member railroads. Cars are not equipped with hitches and bridge plates. Equipped with hydraulic draft gear) | Oct-68 | | NRHS |
| 28 | TTBX | Trailer Train Co. | Apr-70 | | NRHS |
| 29 | TTBX | Trailer Train Co. (flat cars equipped with bi-level auto racks furnished by participant railroads) | 1/75-1/80; eliminated 1/92 | | NRHS |
| 30 | TTBX | TTX Co. (flat cars equipped with bi-level auto racks furnished by participant railroads) | added 1/92; 1/94-7/2000 | | NRHS |
| 31 | TTBX | TTX COMPANY {TRAILER TRAIN COMPANY} | | | PWRC |
| 32 | TTBX | Trailer Train (TTX Corporation) | | | RSRV |
| 33 | TTBX | TTX COMPANY | | | SCAC4 |
