| Abbreviation | Definition |
|---|---|
| TMLU | Taylor Minster Leasing Limited |
| TMLX | Temco Corporation |
| TMLZ | Seaboard Marine Limited |
| TMMU | Transportacion Maritima Mexicana SA |
| TMMU | Transportacion Maritima Mexicana, S. A. |
| TMMX | TMM Logistics |
| TMMZ | TMM Logistics |
| TMO | Vitebsk Seaway and Continental Railway (Lincoln Pacific Railway) |
| TMPX | Texas Municipal Power Agency |
| TMPZ | TIP Intermodal Services |
| TMRC | Tech Model Railroad Club |
| TMRC | Toy Machinery Railroad Car |
| TMRW | Tacoma Rail |
| TMS | Track Monitoring System |
| TMSS | Towanda- Monroeton Shippers Lifeline Incorporated |
| TMSS | Towanda-Monroeton Shippers Lifeline |
| TMT | Trailer Marine Transport Corporation |
| TMT | Trailer Marine Transportation Corporation |
| TMTC | Tri-County Metropolitan Transit District of Oregon |
| TMTU | P and O Tank Masters |