| Abbreviation | Definition |
|---|---|
| NSPZ | Norfolk Southern Railway |
| NSR | Newburgh and South Shore Railroad |
| NSR | Newburgh and South Shore Railroad Company |
| NSRC | North Stratford Railroad |
| NSRL | North South Rail Link |
| NSRX | Jack Frost Cane Sugar |
| NSS | Newburgh and South Shore Railway |
| NSSX | National Salvage and Service Corporation |
| NSTX | North Star Steel |
| NSTX | North Star Steel Company |
| NSW | Newcastle, Sydney, and Wollongong |
| NSWR | New South Wales Railways |
| NSXZ | Norfolk Southern Railway |
| NSXZ | Norfolk Southern Railway Company |
| NSZ | Norfolk Southern Railway |
| NSZ | Norfolk Southern Railway Company |
| NT | Next Train |
| NTIU | Germanischer Lloyd |
| NTKX | VAE Nortrak North America |
| NTKX | VAE Nortrak North America Incorporated |