| Abbreviation | Definition |
|---|---|
| TNVR | Tennessee Valley Railroad Museum |
| TNXU | Transx Limited |
| TNXZ | Transx Limited |
| TOC | Consolidated Rail Corporation |
| TOC | Toledo Ohio Central |
| TOC | Toledo & Ohio Central |
| TOC | Toledo & Ohio Central Railway (Conrail) |
| TOC | Toledo and Ohio Central Raillines |
| TOC | Toledo and Ohio Central Raillines |
| TODU | TTS LLC |
| TOE | Texas, Oklahoma and Eastern Railroad |
| TOE | Texas, Oklahoma, and Eastern RailRoad Company |
| TOEU | Transocean Equipment Management |
| TOFU | TOFC Division of Fruehauf |
| TOFU | TOFC Incorporated Division of Fruehauf |
| TOFZ | TOFC Division of Fruehauf |
| TOFZ | TOFC Incorporated Division of Fruehauf |
| TOLU | Trans Ocean Leasing |
| TOLZ | Trans Ocean Leasing |
| TONU | Trans Ocean Line Limited |