| Abbreviation | Definition |
|---|---|
| DARZ | Dart Intermodal Incorporated |
| DATU | Dart Container Line |
| DATU | Dart Container Line Incorporated |
| DATU | Dart Containerline Incorporated |
| DATX | DATX Associates |
| DAVX | W. R. Grace and Company - Connecticut Davison Chemical Division |
| DAVX | W. R. Grace Conn. Davison Chemical Division |
| DAWX | D.A. Walmsley and Company |
| DAX | Diamond Shamrock Chemicals (Occidental Chemical Corporation) |
| DAX | Occidental Chemical Corporation |
| DBCU | Dry Box |
| DBCX | BASF Corporation |
| DBCX | Dow Badische Corporation (BASF Corporation) |
| DBGU | Dreambox Global |
| DBGX | Dowdle Butane Gas |
| DBSU | Donbar Steamship |
| DBSU | Donbar Steamship Company Incorporated |
| DBUX | CIT Equipment Finance Corporation |
| DBWX | DB Western |
| DC | Delray Connecting Railroad |