| Abbreviation | Definition |
|---|---|
| DRI | Davenport Rock Island and North Western RailRoad Company |
| DRI | Davenport, Rock Island and North Western Railway |
| DRIR | Denver Rock Island Railroad |
| DRMB | DIN rail mount bracket |
| DRMS | Divisional Railway Management System |
| DRMX | Danbury Railway Museum |
| DRMX | Danbury Railway Museum Incorporated |
| DRS | Direct Rail Services |
| DRSX | D.O.T. Rail Services |
| DRTM | Diploma in Rail Transport and Management |
| DRTU | Dart Intermodal |
| DRTU | Dart Intermodal Incorporated |
| DRTZ | Dart Intermodal |
| DRYU | Seacube Container Leasing |
| DSA | Duluth, South Shore & Atlantic Railway (Canadian Pacific Railway) |
| DSA | Soo Line Railroad Company |
| DSBU | Ameribrom |
| DSBU | Ameribrom Incorporated |
| DSCX | DIFCO |
| DSCX | DIFCO Incorporated |