| Abbreviation | Definition |
|---|---|
| CEFX | CIT Group/Capital Finance Incorporated |
| CEI | Chicago and Eastern Illinois Railroad (Union Pacific Railroad) |
| CEI | Union Pacific Railroad Company |
| CEIU | Conteneurs Experts S.D.Inc |
| CEIW | Central Indiana and Western Railroad |
| CEIW | Central Indiana and Western RR Company |
| CELX | Celtran |
| CELX | Celtran Incorporated - Subsidiary of Hoechst Celanese Corporation |
| CEMR | Central Manitoba Railway |
| CEMX | Cementos Mexicanos (Cemex Mexico de CV) |
| CEMX | Sunbelt Cement Incorporated |
| CENX | Central Chemical Co. (Western Aggregates) |
| CENX | Western Aggregates Incorporated |
| CEO | Current Engine Option |
| CEPX | Cajun Electric Power Cooperative |
| CEPX | Cajun Electric Power Cooperative (Trinity Industries Leasing) |
| CEQU | Cleancor Equipment Solutions |
| CERA | Central Railroad Company of Indianapolis |
| CERA | Central Railroad of Indianapolis |
| CERA | Connecticut Electric Railway Association |