| Abbreviation | Definition |
|---|---|
| NYC | Consolidated Rail Corporation |
| NYC | New York Central |
| NYC | New York Central Railroad (CSX Transportation) |
| NYCH | New York Cross Harbor |
| NYCH | New York Cross Harbor Railroad |
| NYCH | New York Cross Harbor Railroad Terminal Corporation |
| NYCN | New York Connecting Railroad |
| NYCTA | New York City Transit Authority |
| NYCX | New York Central Railroad (CSX Transportation) |
| NYD | New York Dock Railway |
| NYER | New York and Eastern Railway |
| NYGL | New York and Greenwood Lake Railway |
| NYKU | N. Y. K. Line |
| NYKU | NYK Line |
| NYKZ | N. Y. K. Line |
| NYKZ | NYK Line |
| NYLB | New York and Long Branch Railroad (Conrail) |
| NYLE | New York and Lake Erie Railroad |
| NYLE | New York and Lake Erie Railroad Company |
| NYLU | Japan Line |