| Abbreviation | Definition |
|---|---|
| SNBL | Sioux City and New Orleans Barge Line |
| SNCF | Société Nationale des Chemins de Fer |
| SNCT | Seattle and North Coast Railroad |
| SNDU | Sandcan |
| SNFX | IND/ AG Chemicals Incorporated |
| SNFX | IND/AG Chemicals |
| SNHX | IND/AG Chemicals |
| SNHX | IND/AG Chemicals Incorporated |
| SNJX | New Jersey Transit |
| SNLU | Schneider National |
| SNLZ | Schneider National |
| SNR | Sunflour Railroad |
| SNTO | Train routing Saginaw, Michigan, to Toledo, Ohio |
| SNWU | Ste National Der Wagon Reservior |
| SO | South Orient |
| SOCX | BP Amoco Chemical BP Oil Division |
| SOCX | British Petroleum Oil Company |
| SOEX | Shell Oil |
| SOEX | Shell Oil Company |
| SOFU | Sofredi |