| Abbreviation | Definition |
|---|---|
| CGNE | Champagne Railroad Incorporated |
| CGOX | Cargill |
| CGOX | Cargill Incorporated |
| CGR | CG Railway |
| CGRX | Consolidated Grain and Barge |
| CGRX | Consolidated Grain and Barge Company |
| CGRY | Carrizo Gorge Railway |
| CGSX | California Gas Service (Amerigas) |
| CGSX | Proflame Incorporated |
| CGT | Canada and Gulf Terminal Railway |
| CGTU | Compagnie Generale Maritime |
| CGTU | Compagnie Generale Maritime (French Line) |
| CGTX | Canadian General Transit (General American Train) |
| CGTX | CGTX Incorporated |
| CGW | Chicago Great Western Railroad (now part of Union Pacific Railroad Company) |
| CGW | Chicago Great Western Railway (Union Pacific Railroad) |
| CGW | Union Pacific Railroad Company |
| CHAT | Chattahoochee and Gulf Railroad |
| CHAU | Combined Transport Group |
| CHAU | Combined Transport Group Incorporated |