| 1 | DWC | Canadian National Rys. | added 1/1993; 1/1994-7/2005 | | NAKINA |
| 2 | DWC | Duluth, Winnipeg & Pacific Ry. | 1/1975-1/1980; eliminated 1/1993 | | NAKINA |
| 3 | DWC | Duluth, Winnipeg & Pacific Ry. | 1/75-1/80; eliminated 1/93 | | NRHS |
| 4 | DWC | Canadian National Rys. | added 1/93; 1/94-7/2000 | | NRHS |
| 5 | DWC | CANADIAN NATIONAL [DULUTH, WINNIPEG & PACIFIC RY.] | | | PWRC |
| 6 | DWC | Duluth, Winnipeg and Pacific Railway (Canadian National Railway) | | | RSRV |
| 7 | DWCA | DULLES WORLD CARGO | | | SCAC4 |
| 8 | DWCC | DAWES CONTRACT CARRIAGE | | | SCAC4 |
| 9 | DWCD | DEWITT COMPANIES LTD LLC | | | SCAC4 |
| 10 | DWCI | DUGGAN, W M CO INC | | | SCAC4 |
| 11 | DWCL | DWIGHT CRANE LTD | | | SCAC4 |
| 12 | DWCM | DURKIN WATER COMPANY L P | | | SCAC4 |
| 13 | DWCN | D & W CONSTRUCTIONS CONTRACTORS | | | SCAC4 |
| 14 | DWCO | DOWNING WORLDWIDE | | | SCAC4 |
| 15 | DWCP | DEEM FARMS | | | SCAC4 |
| 16 | DWCR | DIAMOND STATE WAREHOUSING | | | SCAC4 |
| 17 | DWCT | DAWSON LOGISTICS INC | | | SCAC4 |
| 18 | DWCU | DONGWOO FINE-CHEM CO LTD | | | SCAC4 |
| 19 | DWCX | David Witherspoon, Inc. | added 1/1964; 7/1965-1/1980; eliminated 10/1993; 1/1994-7/2005 | | NAKINA |
| 20 | DWCX | David Witherspoon, Inc. | 7/65-1/80; eliminated 10/93; 1/94-7/2000 | | NRHS |
| 21 | DWCX | DAVID WITHERSPOON, INC. | | | PWRC |
| 22 | DWCX | David Witherspoon | | | RSRV |
| 23 | DWCX | WITHERSPOON INC DAVID | | | SCAC3 |
| 24 | DWCY | DOVER WOODS CABINETRY | | | SCAC4 |
