| Abbreviation | Definition |
|---|---|
| NYLU | Japan Line Limited |
| NYO&W | New York, Ontario, & Western Railroad |
| NYOG | New York and Ogdensburg Railway |
| NYSW | New York Susquehanna and Western Railway Corporation |
| NYSW | New York, Susquehanna and Western Railway |
| NYSX | New York State Electric and Gas Corporation |
| NZCU | Shipping Corporation Of New Zealand |
| NZCU | Shipping Corporation Of New Zealand Limited |
| NZR | New Zealand Railroad |
| NZSU | Shipping Corporation Of New Zealand |
| NZSU | Shipping Corporation Of New Zealand Limited |
| NZX | National Zinc |
| OACX | Central Transportation |
| OAPS | Ottawa, Arnprior, & Parry Sound Railway |
| OAPSR | Ottawa, Arnprior, & Parry Sound Railway |
| OAR | Old Augusta Railroad |
| OAR | Old Augusta Railroad Company |
| OART | Open Access Rail Terminal |
| OCCR | Operationeel Controle Centrum Rail |
| OCCU | ATS Container Leasing S. A. |