| Abbreviation | Definition |
|---|---|
| NEPU | Neptune Orient Lines Limited |
| NER | North Eastern Railway |
| NERR | Nashville and Eastern Railroad |
| NERT | New England Rail Trail |
| NERX | Transportation Management Services |
| NERX | Transportation Management Services Incorporated (formerly North Eastern Rail Exchange) |
| NERZ | GE Capital Corporation |
| NERZ | General Electric Capital Corporation |
| NESX | Nestle Brands FoodService Company Division of Nestle Food Company |
| NET | Norfolk Electric Transit |
| NETU | Netumar Lines |
| NETX | Nemic Leasing Corporation |
| NEZP | Nezperce Railroad |
| NFD | Norfolk, Franklin and Danville Railway (Norfolk and Western Railway) |
| NFLZ | Flexi-Van Leasing |
| NFPX | Newaygo Forest Products |
| NFPX | Newaygo Forest Products Limited |
| NGCR | North Georgia Commuter Rail |
| NGCU | Nisshin Gulf Coast |
| NGIX | Northern Grain |