| Abbreviation | Definition |
|---|---|
| CDAU | Canadian Tire Corporation Ltd. |
| CDAZ | Canadian Tire Corporation Limited |
| CDAZ | Canadian Tire Corporation Ltd. |
| CDCX | Air Liquide America Corporation |
| CDCX | Capitol Dairy Co. (Air Liquide America Corporation) |
| CDGX | Carolinas Domestic Gas (Chatham Oil) |
| CDGX | Service Oil Company |
| CDHX | Caledonian Rail Lines |
| CDLZ | Cardinal Freight Carriers |
| CDNU | Carotrans International |
| CDPX | Chevron USA |
| CDT | Crossover Diamond Tracks |
| CDTX | California Department of Transportation |
| CDTX | California Department of Transportation (Amtrak California) |
| CDVX | Caddo Valley Railcar Repair |
| CEBX | Combustion Engineering |
| CEBX | Combustion Engineering Incorporated |
| CEDR | Cedar River Railroad |
| CEDR | Cedar River Railroad Company |
| CEFX | CIT Equipment Finance Corporation |