| Abbreviation | Definition |
|---|---|
| TUST | Texarkana Union Station Trust |
| TVAX | Tennessee Valley Authority |
| TVBX | T V B X Group |
| TVBX | TVGX Group |
| TVLR | Tanat Valley Light Railway |
| TVM | Ferrocarriles Nacionales de Mexico |
| TVRM | Tennessee Valley Railroad Museum |
| TVRR | Tulare Valley Railroad |
| TVRR | Tulare Valley Railroad Company |
| TWAIN | A Stwing of Wail Woad Cars |
| TWE | Teutoburger Wald Eisenbahn |
| TWGX | Tidewater Grain |
| TWLZ | Trans West Logistics |
| TWNZ | Twinstar Leasing Limited |
| TWPU | Tropical Western Pacific Program Office |
| TWRY | Tradewater Railway |
| TWSX | A. E. Staley Manufacturing Company |
| TWSX | Tate & Lyle (AE Staley Manufacturing) |
| TXGN | Texas Gonzales and Northern Railway |
| TXGN | Texas Gonzales and Northern Railway Company |