| Abbreviation | Definition |
|---|---|
| TXIX | Texas Industries |
| TXIX | Texas Industries Incorporated |
| TXNW | Texas North Western Railway |
| TXNW | Texas North Western Railway Company |
| TXOR | Texas and Oklahoma Railroad |
| TXOR | Texas and Oklahoma Railroad Company |
| TXPF | Texas Pacifico Transportation Limited |
| TXPX | Texas Petrochemicals Corporation |
| TXR | Texas Rock Crusher Railway |
| TXR | Texas Rock Crusher Railway Company |
| TXTC | Texas Transportation |
| TXTC | Texas Transportation Company |
| TXTX | Econo-Rail Corporation |
| TXUX | TU Electric |
| TXUX | TXU Electric |
| TXXU | Trident Seafoods Corp |
| TXXZ | Trac Lease |
| TXXZ | Trac Lease Incorporated |
| TYBR | Tyburn Railroad |
| TYBR | Tyburn Railroad Company |