| Abbreviation | Definition |
|---|---|
| SAWU | Swedish Atlantic- Wilshelsen Line |
| SAWU | Swedish Atlantic-Wilshelsen Line |
| SAWX | Sawco |
| SAWX | Sawyer Gas of Jacksonville Incorporated |
| SAZX | Saz Transportation Corporation |
| SB | South Buffalo Railway |
| SB | South Buffalo Railway Company |
| SBC | Ferrocarril Sonora Baja California |
| SBC | Ferrocarriles Nacionales de Mexico |
| SBD | CSX Transportation Incorporated |
| SBD | Seaboard System Railroad (CSX Transportation) |
| SBDZ | CSX Transportation Incorporated |
| SBDZ | Seaboard System (CSX Transportation) |
| SBGU | Marine Transportation Services Sea- Barge Group |
| SBGU | Marine Transportation Services Sea-Barge Group |
| SBGX | Industry Financial Corporation |
| SBIU | Sea Box |
| SBIX | Standard Brands |
| SBK | South Brooklyn Railway |
| SBK | South Brooklyn Railway Company |