| Abbreviation | Definition |
|---|---|
| SRC | Strasburg Railroad Company |
| SRCP | Simple Railroad Command Protocol |
| SRCX | Sid Richardson Carbon |
| SRCX | Sid Richardson Carbon Company |
| SREX | StatesRail Equipment |
| SREX | StatesRail Equipment Company, LLC |
| SRIX | Southern Region Industrial Realty (Southwest Rail Industries) |
| SRIX | Southwest Rail Industries Incorporated |
| SRL | Swaziland Rail Link |
| SRL | Swift Refrigerator Lines |
| SRLX | General American Transportation Corporation (GATX) |
| SRLX | Southern Rail Leasing Incorporated |
| SRN | Sabine River and Northern Railroad |
| SRN | Sabine River and Northern RR Company |
| SRNJ | Southern Railroad Company of New Jersey |
| SRNJ | Southern Railroad of New Jersey |
| SROX | United States Department of Energy Savannah River Operations Office |
| SRP | Safe Handling Rail |
| SRPX | Salt River Project Agricultural Improvement and Power District |
| SRRX | Star Railroad Equipment |