| 1 | TSR | Trans Service Airlift | Callsign: Trans Service, | ZRE | AVCODES |
| 2 | TSR | TJS San Marino | Callsign: San Marino, Subsidary of Tyrolean Jet Services. | RSM | AVCODES |
| 3 | TSR | Trans Service Airlift | | | ICAO1 |
| 4 | TSR | TEXAS STATE RAILROAD | | | PWRC |
| 5 | TSR | Texas State Railroad | | USA | TRAFFIC |
| 6 | TSR | TSR Recycling GMBH & CO. KG | | DE | VKM |
| 7 | TSRA | TRANSPORT ROUT-AM INC | | | SCAC4 |
| 8 | TSRC | TIDEWATER SOUTHERN RAILWAY CO. | | | PWRC |
| 9 | TSRC | TRANSPORTES REFRIGERADOS CHONG | | | SCAC4 |
| 10 | TSRD | Twin State R.R. Co. | added 10/1988; 1/1994-7/2005 | | NAKINA |
| 11 | TSRD | Twin State R.R. Co. | added 10/88; 1/94-7/2000 | | NRHS |
| 12 | TSRD | TWIN STATE RAILROAD COMPANY | | | PWRC |
| 13 | TSRD | Twin State Railroad | | | RSRV |
| 14 | TSRD | TWIN STATE RAILROAD COMPANY | | | SCAC4 |
| 15 | TSRF | TRANSPORTES ROFRA | | | SCAC4 |
| 16 | TSRG | TRI-STAR TRUCKING | | | SCAC4 |
| 17 | TSRI | TEXAS SOUTHERN RAILROAD, INC. | | | PWRC |
| 18 | TSRK | TRANSPORTATION SERVICES INC | | | SCAC4 |
| 19 | TSRL | TRANSPORT RICHARD LABRIE INC | | | SCAC4 |
| 20 | TSRN | TRANSTAR ONE AND ASSOCIATES INC | | | SCAC4 |
| 21 | TSRR | Tennessee Southern R.R. Co., Inc. | added 7/1988; 1/1994; eliminated 7/1995; 7/2000-7/2005 | | NAKINA |
| 22 | TSRR | Tennessee Southern R.R. Co., Inc. | added 7/88; 1/94; eliminated 7/95; 7/2000 | | NRHS |
| 23 | TSRR | TENNESSEE SOUTHERN RAILROAD COMPANY, INC. | | | PWRC |
| 24 | TSRR | Tennessee Southern Railroad | | | RSRV |
| 25 | TSRR | TENNESSEE SOUTHERN RAILROAD CO INC | | | SCAC4 |
| 26 | TSRR | Tennessee Southern R.R. Co., Inc. | | USA | TRAFFIC |
| 27 | TSRU | TRANS SINERGIA | | RUS | BIC |
| 28 | TSRU | TRANSRAIL GMBH | | | SCAC4 |
| 29 | TSRX | ONEIL TRANSPORTATION SERVICES INC | | | SCAC4 |
| 30 | TSRY | TRI-STATE RECOVERY | | | SCAC4 |
