| Abbreviation | Definition |
|---|---|
| SWFX | Stone Container Corporation |
| SWFZ | Swift Transportation |
| SWGR | Seagraves Whiteface and Lubbock Railroad |
| SWGU | Sunstone Water Group |
| SWGX | Southwest Georgia Railroad Excursion Authority (SAM Shortline Excursion Train) |
| SWIX | Stonewall Industries |
| SWKR | San Pedro and Southwestern Railway |
| SWKR | San Pedro and Southwestern Railway Company |
| SWLX | Essel Corporation |
| SWML | SouthWestern Main Line |
| SWP | Southwest Pennsylvania Railroad |
| SWP | Switch Point |
| SWPX | Southwestern Portland Cement |
| SWPX | Southwestern Portland Cement Company |
| SWRU | SWIFT Intermodal |
| SWRX | Richmond Rail Equipment Leasing |
| SWRX | Transportation Equipment Incorporated |
| SWRZ | SWIFT Intermodal |
| SWSTD | Switch Stand |
| SWT | South West Trains |