| 1 | TRM | Transport Aerien de Mauritanie (TAM) | Callsign: Sotrans, | RIM | AVCODES |
| 2 | TRM | TAM Transports Aériens Méditerranéens | Callsign: Airtam, | F | AVCODES |
| 3 | TRM | Transport Aerien de Mauritanie | | | ICAO1 |
| 4 | TRMA | TRANSMARITIMA S A | | | SCAC4 |
| 5 | TRMB | TROUTMAN TRANSPORTATION LLC | | | SCAC4 |
| 6 | TRMD | TRANSPORTES REFRIGERADOS MAGNOLIA | | | SCAC4 |
| 7 | TRME | TRANSPORT MOTOR EXPRESS CO | | | PWRC |
| 8 | TRME | TRIMSA | | | SCAC4 |
| 9 | TRMK | T R L TRUCKING | | | SCAC4 |
| 10 | TRML | TRAMIL S A DE C V | | | SCAC4 |
| 11 | TRMN | TRUMAN TRANSFER & STORAGE INC | | | SCAC4 |
| 12 | TRMP | TARGET RESOURCES OF NORTHEASTERN PA | | | SCAC4 |
| 13 | TRMQ | TERMINAL TRANSPORTATION SERVICES DI | | | SCAC4 |
| 14 | TRMS | TRANSPORTES MUSA | | | SCAC4 |
| 15 | TRMT | TRANSPORT ROMATT INC | | | SCAC4 |
| 16 | TRMU | TARIMSAL KIMYA A.S. | | TR | BIC |
| 17 | TRMU | TRANSMARINE HAMBURG GMBH | | | SCAC4 |
| 18 | TRMV | TRANSPORTES RAMCE SA DE CV | | | SCAC4 |
| 19 | TRMW | City of Tacoma, d/b/a Tacoma Rail Mountain Division | 7/2000-7/2005 | | NAKINA |
| 20 | TRMW | City of Tacoma, d/b/a Tacoma Rail Mountain Division | Jul-00 | | NRHS |
| 21 | TRMW | CITY OF TACOMA d/b/a TACOMA RAIL MOUNTAIN DIVISION | | | PWRC |
| 22 | TRMW | Tacoma Rail Mountain Division | | | RSRV |
| 23 | TRMW | TACOMA RAIL MOUNTAIN DIVISION | | | SCAC4 |
| 24 | TRMX | The Railroad Museum—TRM Industries | 1/1975; added 4/1975; 1/1980; eliminated 1/1992; added 4/1992; 1/1994-7/2000; eliminated 1/2001; added 4/2001; 7/2005; eliminated 7/2007 | | NAKINA |
| 25 | TRMX | The Railroad Museum--TRM Industries | 1/75; added 4/75; 1/80; eliminated 1/92; added 4/92; 1/94-7/2000; eliminated 1/2001; added 4/2001 | | NRHS |
| 26 | TRMX | *TACOMA RAIL MOUNTAIN DIVISION | | | PWRC |
| 27 | TRMX | +THE RAILROAD MUSEUM - TRM INDUSTRIES | | | PWRC |
| 28 | TRMX | TRM Industries | | | RSRV |
| 29 | TRMX | THE RAILROAD MUSEUM-TRM INDUSTRIES | | | SCAC4 |
