| Abbreviation | Definition |
|---|---|
| CTRN | Central of Tennessee Railway |
| CTRN | Central of Tennessee Railway and Navigation Company |
| CTRR | Cabot Trail Relay Race |
| CTRR | Chisholm Trail RailRoad Company |
| CTRR | Cloquet Terminal RailRoad |
| CTRR | Cumbres & Toltec Scenic RailRoad |
| CTRU | Container Trading |
| CTRU | Container Trading Company |
| CTRW | Carlton Trail Railway |
| CTRW | Carlton Trail Railway Company |
| CTRX | C and T Refinery |
| CTRX | C and T Refinery Incorporated |
| CTSU | Bibby Bros (Socodei) |
| CTSU | Bibby Bros Company |
| CTSX | Chem Comp Systems - CTS Cement Manufacturing Incorporated |
| CTSX | CTS Cement Manufacturing (Chem Comp Systems) |
| CTSZ | Carotrans International |
| CTTX | Trailer Train (TTX Corporation) |
| CTTX | TTX Company |
| CTUU | Container Trading |