| Abbreviation | Definition |
|---|---|
| CHAX | Chartrand's Tank Car Service |
| CHEX | Chemplex (Equistar Chemicals) |
| CHEX | Equistar Chemicals |
| CHFU | Challenge International |
| CHH | Cheswick and Harmar |
| CHIU | Chimco |
| CHIU | Chimco - Bulgaria |
| CHLX | Chemelco Incorporated |
| CHLX | Chemleco |
| CHMX | C. H. Masland and Sons (First Union Rail) |
| CHMX | Southern Illinois Railcar Incorporated |
| CHNY | Cheney Railroad Company Incorporated |
| CHP | Ferrocarril de Chihuahua al Pacifico de CV (Ferrocarriles Nacionales de Mexico) |
| CHP | Ferrocarriles Nacionales de Mexico |
| CHR | Chestnut Ridge Railway |
| CHR | Chestnut Ridge Railway Company |
| CHRC | Chaparral Railroad |
| CHRC | Chaparral Railroad Company Incorporated |
| CHRR | Chesapeake Railroad |
| CHRR | Chesapeake Railroad Company |