| Abbreviation | Definition |
|---|---|
| TLIU | Trans Leasing |
| TLIU | Trans Leasing Incorporated |
| TLLU | TAL International |
| TLLX | Trinity Industries Leasing |
| TLTX | Tilcon Tomasso Quarries Incorporated |
| TLTX | Tilcon-Tomasso Construction |
| TM | Texas Mexican Railway (Kansas City Southern Railway) |
| TM | Texas Mexican Railway Company |
| TMAX | Tenneco Packaging Company |
| TMAX | Tennessee River Pulp and Paper |
| TMBL | Tacoma Municipal Belt Line Railway |
| TMCX | Temco Corporation |
| TMEX | Trinity Industries Leasing |
| TMEZ | TAL International (BNSF Railway) |
| TMEZ | Transamerica Leasing Incorporated |
| TMGX | Transporte Multimodal de Granos |
| TMIX | TransMatrix |
| TMIX | TransMatrix Incorporated |
| TMKZ | Transport International Pool |
| TMKZ | Transport International Pool Incorporated |