| 1 | TRR | Tramson Limited | Callsign: Tramson, | SUD | AVCODES |
| 2 | TRR | North Aamerican Airlines | Callsign: Terra, | CDN | AVCODES |
| 3 | TRR | Tramson Limited | | | ICAO1 |
| 4 | TRR | Traditionsbahn Radebeul-Radeburg eV | Radebeul | D | privat-bahn.de |
| 5 | TRR | THUNDER RAIL, LTD. | | | PWRC |
| 6 | TRR | THUNDER RAIL LTD | | | SCAC4 |
| 7 | TRRA | Terminal R.R. Association of St. Louis | 8/1920-7/2005 | | NAKINA |
| 8 | TRRA | Terminal R.R. Association of St. Louis | 4/38-7/2000 | | NRHS |
| 9 | TRRA | TERMINAL RAILROAD ASSOCIATION OF ST. LOUIS | | | PWRC |
| 10 | TRRA | Terminal Railroad Association of St Louis | | | RSRV |
| 11 | TRRA | Terminal Railroad Association of St. Louis | | USA | TRAFFIC |
| 12 | TRRB | TRANSPORT ROBERT (1973) LTEE | | | SCAC1 |
| 13 | TRRB | TRANSPORT ROBERT (1973) LTEE | | | SCAC4 |
| 14 | TRRC | THREE R (3R) AUTOMOTIVE | | | SCAC4 |
| 15 | TRRE | TRANSPORTES RAMIRO | | | SCAC4 |
| 16 | TRRG | TRANSPORT R GINGRAS INC | | | SCAC4 |
| 17 | TRRK | T R TRUCKING INC | | | SCAC4 |
| 18 | TRRL | THIRD (3RD) ROCK LOGISTICS LLC | | | SCAC4 |
| 19 | TRRO | TRANS REF ROMAN ROMAN | | | SCAC4 |
| 20 | TRRP | TRANSPORT R C POIRIER | | | SCAC4 |
| 21 | TRRQ | TRANSPORT ROUMAR INC | | | SCAC4 |
| 22 | TRRR | TRANS RAPIDS RRR | | | SCAC4 |
| 23 | TRRS | TRANS-TORRES CO | | | SCAC4 |
| 24 | TRRT | TRI-R TRANSPORT LTD | | | SCAC4 |
| 25 | TRRU | TRANSPORT RESOURCES INC. | | USA | BIC |
| 26 | TRRU | Transport Resources | | | RSRV |
| 27 | TRRU | TRANSPORT RESOURCES INC | | | SCAC4 |
| 28 | TRRX | THREE RIVERS RAILWAY CO. (OUT OF OPERATION 01/94) | | | PWRC |
| 29 | TRRY | Trillium Railway Co. Ltd. | added 1/2004; eliminated 4/2004; 7/2005 | | NAKINA |
| 30 | TRRY | TRILLIUM RAILWAY CO. LTD. | | | PWRC |
| 31 | TRRY | Trillium Railway | | | RSRV |
| 32 | TRRY | TRILLIUM RAILWAY CO LTD | | | SCAC4 |
| 33 | TRRZ | TRAP ROCK | | | PWRC |
