| Abbreviation | Definition |
|---|---|
| TAXZ | Trac Lease |
| TAXZ | Trac Lease Incorporated |
| TAZX | Trade Wind Limited |
| TBA | Trains of Buenos Aires |
| TBCU | Boeing Company |
| TBCU | The Boeing Company |
| TBCX | Boeing Company |
| TBCX | The Boeing Company |
| TBER | Terre Haute Brazil and Eastern Railroad |
| TBOX | TTX Corporation |
| TBRX | Taylor Rail Group |
| TBRY | Thermal Belt Railway |
| TBV | Trinity and Brazos Valley Railway |
| TCAX | General Electric Railcar Services Corporation |
| TCAX | Transportation Corporation of America |
| TCB | Texas Central Business Lines Corporation |
| TCBR | Tecumseh Branch Connecting Railroad |
| TCCX | TCCX Corporation |
| TCDX | Tennessee Chemical |
| TCDX | Union Tank Car Company |