| Abbreviation | Definition |
|---|---|
| NTL | Next To Link |
| NTLX | Nashtex Leasing |
| NTLX | Nashtex Leasing Incorporated |
| NTNU | National Container Network |
| NTNU | National Container Network Incorporated |
| NTR | Mississippi Central Railroad Company |
| NTR | Natchez Trace Railroad (Mississippi Central Railroad) |
| NTRX | NTL Transportation Corporation |
| NTRY | Nimishillen and Tuscarawas |
| NTRY | Nimishillen and Tuscarawas Railway Company |
| NTSX | Northeast Transportation Service |
| NTTX | Trailer Train (TTX Corporation) |
| NTTX | TTX Company |
| NTZR | Natchez Railway |
| NU | Northumberland And Union |
| NUCX | Nucor Steel Crawfordsville |
| NUCX | Nucor Steel Crawfordsville - Division of Nucor Corporation |
| NUDU | SCM Inc. |
| NUIU | Triton Container International |
| NUSU | Neptune Orient Lines |