| 1 | DCR | Discovery Ltd | Callsign: Disco, | UA | AVCODES |
| 2 | DCR | Devon & Cornwall Railways Limited | | GB | TRAFFIC |
| 3 | DCRC | DECORACION COLONIAL S A | | | SCAC4 |
| 4 | DCRG | DRIFTWOOD CROSSING | | | SCAC4 |
| 5 | DCRH | DIAMOND C RANCH LIMOUSIN | | | SCAC4 |
| 6 | DCRI | DANIEL CARRIER INC | | | SCAC4 |
| 7 | DCRK | DOVECREEK DE MEXICO SA DE CV | | | SCAC4 |
| 8 | DCRL | DISNEY CRUISE LINE | | | SCAC4 |
| 9 | DCRN | D/C TRANSPORT INC | | | SCAC4 |
| 10 | DCRQ | DCR EXPRESS INC | | | SCAC4 |
| 11 | DCRR | Dubois County R.R. | 1/1994-7/2005 | | NAKINA |
| 12 | DCRR | Dubois County R.R. | 1/94-7/2000 | | NRHS |
| 13 | DCRR | DUBOIS COUNTY RAILROAD | | | PWRC |
| 14 | DCRR | Dubois County Railroad | | | RSRV |
| 15 | DCRR | DUBOIS COUNTY RAILROAD | | | SCAC4 |
| 16 | DCRT | DCR TRUCKING INC | | | SCAC4 |
| 17 | DCRX | DEADWOOD CENTRAL RAILROAD COMPANY | | | PWRC |
| 18 | DCRY | DCR TRUCKING INC | | | SCAC4 |
