| Abbreviation | Definition |
|---|---|
| MWT | Mid-West Terminal Warehouse Company |
| MWTT | Michigan-Wisconsin Transportation |
| MXLU | Mexican Line |
| MZIZ | Marko B Zanovich |
| N&W | Norfolk Western railroad |
| N&W | Norfolk & Western railroad |
| NABU | E C S T Container Services and Trading, GmBH |
| NABU | Ecst Container Services and Trading |
| NACR | Nashville and Ashland City Railroad |
| NACX | General Electric Railcar Services Corporation |
| NACX | Niagara Alkali Co. (GE Rail Services) |
| NADU | North American Domestic Container Corporation |
| NADU | REDON Incorporated |
| NADX | General Electric Railcar Services Corporation |
| NADX | North American Domestic Container Corporation (GE Rail Services) |
| NADZ | North American Domestic Container Corporation |
| NADZ | REDON Incorporated |
| NAFX | GE Rail Services |
| NAFX | General Electric Railcar Services Corporation |
| NAHX | GE Rail Services |