| Abbreviation | Definition |
|---|---|
| STLU | Matson Navigation |
| STLU | Matson Navigation Company |
| STLW | South Texas Locomotive Works |
| STLX | A. E. Staley Manufacturing |
| STLX | A. E. Staley Manufacturing Company |
| STLZ | Matson Navigation |
| STLZ | Matson Navigation Company |
| STMA | St. Maries River Railroad |
| STMA | St. Maries River Railroad Company |
| STMX | A. E. Staley Manufacturing |
| STMX | A. E. Staley Manufacturing Company Industrial Products Group |
| STMZ | Texas Mexican Railway |
| STMZ | Texas Mexican Railway Company |
| STOX | ACF Industries |
| STOX | ACF Industries Incorporated Amcar Division |
| STPX | Strategic Transport Systems |
| STR | Shawnee Terminal Railway |
| STR | Shawnee Terminal Railway Company |
| STRC | Stuart Chemical Transportation |
| STRT | Stewartstown Railroad |