| Abbreviation | Definition |
|---|---|
| TPT | Conrail |
| TPTU | Exsif Worldwide |
| TPTX | Trailer Train (TTX Corporation) |
| TPTX | Trailer Train Company |
| TPW | Toledo, Peoria and Western Railroad (BNSF Railway) |
| TPW | Toledo, Peoria, and Western Railway Corporation |
| TPWS | Train Protection Warning System |
| TPWZ | Toledo, Peoria, and Western Railway Corporation |
| TPXU | Tiphook Container Rental Company Limited |
| TPXU | Tiphook Container Rental Limited |
| TPZ | Missouri Pacific Railroad (Union Pacific Railroad) |
| TPZ | Union Pacific Railroad Company |
| TQEX | First Union Rail |
| TQMU | Intermodal Tank Transport |
| TR | Tomahawk Railway |
| TR | Tomahawk Railway, L. P. |
| TRAC | the Rail Agent Course |
| TRAU | Associated Transport Line |
| TRAX | Railtex |
| TRAX | Railtex Incorporated |