| 1 | DPR | duisport rail GmbH | | DE | VKM |
| 2 | DPRA | DIAZ PRODUCE | | | SCAC4 |
| 3 | DPRD | DANAS PRIDE | | | SCAC4 |
| 4 | DPRN | DOYLE TRANSPORTATION INC | | | SCAC4 |
| 5 | DPRO | DOME PRODUCTIONS INC | | | SCAC4 |
| 6 | DPRT | DAIGLE EXPRESS TRANSPORT INC | | | SCAC4 |
| 7 | DPRU | LLC KVADRAT | | RUS | BIC |
| 8 | DPRX | Deep Rock Refining Co. | added 4/1956; 10/1957-10/1966; eliminated 7/1968 | | NAKINA |
| 9 | DPRX | Deep Rock Refining Co. | 10/57-10/66; eliminated 7/68 | | NRHS |
| 10 | DPRX | DEEP ROCK REFINING CO. | | | PWRC |