| Abbreviation | Definition |
|---|---|
| CN | Canadian National Railway |
| CN | Cincinnati Northern Railroad |
| CN | Cincinnati Northern Railroad |
| CNA | Canadian National Railway |
| CNAZ | Canadian National Railway |
| CNAZ | Grand Trunk Western Railroad Incorporated |
| CNCX | Columbia Nitrogen Corporation |
| CNDX | Connecticut Department of Transportation |
| CNE | Central New England Railway (New York, New Haven and Hartford Railroad) |
| CNEU | Canadian National Railway |
| CNEZ | Canadian National Railway |
| CNGU | Sicng ( Ind. Chim. du Nord de la Grece, S. A.) |
| CNGU | SICNG (Ind. Chim. Du Nord de la Grece SA) |
| CNGX | CONAG Finance |
| CNGX | CONAG Finance Incorporated-CNG Transmission Corporation |
| CNHX | Ontario Hydro |
| CNHX | Ontario Hydro (Ontario Power Generation) |
| CNIS | Canadian National Railway |
| CNJ | Central Railroad of New Jersey (Norfolk Southern) |
| CNJ | Consolidated Rail Corporation |