| Abbreviation | Definition |
|---|---|
| DAFU | Dafra Lines |
| DAFU | Dafra Lines SA |
| DAFX | U.S. Department of Defense - Troop Support |
| DAFX | United States Department of Defense - Army |
| DAFZ | Dafra Lines |
| DAFZ | Dafra Lines SA |
| DAHU | Dahlson Industries |
| DAIR | D and I Railroad Company |
| DAIR | D&I Railroad |
| DAKR | Dakota Rail |
| DAKR | Dakota Rail Incorporated |
| DAKS | Dakota Short Line |
| DAKX | DAK Americas |
| DALT | Dallas Terminal Railway |
| DALZ | D and A Leasing |
| DALZ | D and A Leasing Incorporated |
| DAPX | Dairyland Power Cooperative |
| DARU | Dart Container Line |
| DARU | Dart Containerline Incorporated |
| DARZ | Dart Intermodal |