| Abbreviation | Definition |
|---|---|
| CNRR | California Northern Railroad |
| CNRU | Canadian National Railway |
| CNRX | Canadian National Railway |
| CNRZ | Canadian National Railway |
| CNSU | CNS Logistics |
| CNSX | Consolidated Oil and Transportation |
| CNTP | Cincinnati New Orleans and Texas Pacific Railway Company |
| CNTP | Cincinnati, New Orleans and Texas Pacific Railway |
| CNTU | ITL Technology |
| CNTX | Continental Tank Car Corporation |
| CNUR | C and NC Railroad Corporation |
| CNUR | C&NC Railroad |
| CNVX | Convoyeur National |
| CNW | Chicago and North Western Railway (Union Pacific Railroad) |
| CNW | Union Pacific Railroad Company |
| CNWS | Chicago and North Western Railway (Union Pacific Railroad) |
| CNWX | Canadian Wheat Board |
| CNWZ | Chicago and North Western Railway (Union Pacific Railroad) |
| CNWZ | Union Pacific Railroad Company |
| CNYK | Central New York Railroad |