| Abbreviation | Definition |
|---|---|
| DTZZ | Direct Transit Incorporated |
| DUCX | Du Pont Canada |
| DUCX | Du Pont Canada Incorporated |
| DUFX | Duffy and Sons |
| DUKX | Dupps |
| DUKX | Dupps Company |
| DUPX | Du Pont De Nemours and Company Incorporated |
| DUPX | DuPont |
| DUT | Denver Union Terminal Railway |
| DUT | Denver Union Terminal Railway Company |
| DUTC | Dallas Union Terminal |
| DV | Delaware Valley Railway |
| DV | Delaware Valley Railway Company |
| DVLX | Duval Corporation (Freeport-McRo-Ran Sulphur) |
| DVLX | Freeport-McRo-Ran Sulphur Company |
| DVR | Devco Railway (Sydney Coal Railway) |
| DVR | Devco Railway Cape Breton Development Corporation (Coal Division) |
| DVRU | Dover |
| DVRU | Dover Limited |
| DVS | Delta Valley and Southern Railway |