| Abbreviation | Definition |
|---|---|
| CR | Caledonian Railways |
| CR | Central Railway |
| CR | Circular Railway |
| CR | Common Rail |
| CR | Conrail (Norfolk Southern) |
| CR | Conrail Railroad Reporting Mark |
| CR | Consolidated Rail Corporation |
| CRAX | Crystal Hopper Associates |
| CRAZ | Cornucopia Transportation |
| CRAZ | Cornucopia Transportation Incorporated |
| CRCR | Crete Carrier Corporation |
| CRCU | Consolidated Rail Corporation |
| CRCX | Conrail Shared Assets Operations |
| CRCZ | Conrail (Norfolk Southern) |
| CRCZ | Consolidated Rail Corporation |
| CRD | Common Rail Diesel |
| CRD | Common Rail Direct |
| CRDI | Common Rail Direct Injection |
| CRDX | Chicago Freight Car Leasing |
| CRDX | Chicago Freight Car Leasing Company |