| Abbreviation | Definition |
|---|---|
| TTQX | Trailer Train (TTX Corporation) |
| TTQX | TTX Company |
| TTR | Tal Tonnage in Rail |
| TTR | Talleyrand Terminal Railroad |
| TTR | Talleyrand Terminal Railroad Company |
| TTR | Tijuana and Tecate Railway (Talleyrand Terminal Railroad) |
| TTR | Toy Trunk Railroad |
| TTRB | Tilted Thunder Rail Birds |
| TTRU | Tropical Shipping and Construction Company Limited |
| TTRU | Tropical Shipping and Construction Limited |
| TTRX | Trailer Train (TTX Corporation) |
| TTRX | TTX Company |
| TTRZ | Train Trailer Rentals Limited |
| TTSX | Trailer Train (TTX Corporation) |
| TTSX | TTX Company |
| TTSZ | Triton Transport Services |
| TTTU | Transport International Containers SA |
| TTTU | Transport International Containers, S. A. |
| TTTX | Trailer Train (TTX Corporation) |
| TTTX | TTX Company |