| Abbreviation | Definition |
|---|---|
| MNC | Missouri North Central Railroad |
| MNCW | Metro-North Commuter Railroad |
| MNCX | Minnesota Corn Processors |
| MNCX | Minnesota Corn Processors Incorporated |
| MNJ | Middletown and New Jersey Railway |
| MNJ | Middletown and New Jersey Railway Company Incorporated |
| MNLU | Malaysian International Shipping Corporation |
| MNLX | Mobil Oil (Exxon-Mobil Corporation) |
| MNLX | Mobil Oil Corporation |
| MNN | Minnesota Northern Railroad |
| MNN | Minnesota Northern Railroad Incorporated |
| MNNR | Minnesota Commercial Railway |
| MNNR | Minnesota Commercial Railway Company |
| MNPX | Morton International Incorporated |
| MNPX | Morton Norwich Products (Morton International) |
| MNR | Metro North Rail |
| MNR | Metro North Railroad |
| MNRR | Metro-North RailRoad |
| MNRT | Mobile Nucular Rail Transport |
| MNRX | Northstar Line |