| Abbreviation | Definition |
|---|---|
| SFRE | Atchison, Topeka and Santa Fe Railway (BNSF Railway) |
| SFRP | Atchison, Topeka and Santa Fe Railway (BNSF Railway) |
| SFRX | Philip Metals |
| SFRX | Southern Foundry Supply Incorporated |
| SFS | Santa Fe Southern Railway |
| SFS | Santa Fe Southern Railway Incorporated |
| SFSX | San Francisco Transportation Services |
| SFSX | San Francisco Transportation Services Company Incorporated |
| SFTU | Atchison, Topeka and Santa Fe Railway (BNSF Railway) |
| SFTU | Burlington Northern and Santa Fe Railway Company |
| SFTX | Continental Tank Car Corporation |
| SFTZ | Atchison, Topeka and Santa Fe Railway (BNSF Railway) |
| SFTZ | Burlington Northern and Santa Fe Railway Company |
| SFVZ | Atchison, Topeka and Santa Fe Railway (BNSF Railway) |
| SFVZ | Burlington Northern and Santa Fe Railway Company |
| SGAU | Saga and Company Limited |
| SGAU | Saga and Limited |
| SGAX | SGA Leasing |
| SGAX | SGA Leasing Company |
| SGCX | Sungas Corporation of Florida |