| Abbreviation | Definition |
|---|---|
| CCC&SteLouis | Cleveland, Columbus, Cincinnati, St. Louis |
| CCC&SteLouis | Cleveland, Columbus, Cincinnati, & St. Louis |
| CCCL | Connecticut Central Railroad |
| CCCL | Connecticut Central Railroad Company |
| CCCU | Compass Container |
| CCCU | Compass Container Company, Incorporated |
| CCCX | Carondelet Coke Corporation |
| CCCZ | Compass Container |
| CCCZ | Compass Container Company, Incorporated |
| CCDX | Co-operative Creameries Dairy Line (Dayton Power and Light) |
| CCDX | Dayton Power and Light Company |
| CCEZ | Chicago Central and Pacific Railroad |
| CCEZ | Chicago Central and Pacific Railroad Company |
| CCFG | Chemin de fer Gaspésie |
| CCFZ | Chi-Can Freight Forwarding |
| CCGX | Cando Contracting |
| CCGX | Cando Contracting Limited |
| CCHX | Columbian Chemicals Canada |
| CCHX | Columbian Chemicals Canada Limited |
| CCIM | Corpus Christi Terminal Railroad |