Directory of Class III and regional railroads in the United States
670
Total Railroads
657
Short Lines
45
States
6
Class I
7
Class II
657
Short Line
670 railroads
| Mark | Railroad Name | Class | State(s) |
|---|---|---|---|
| CMPA | Madison Railroad | Short Line | |
| MVRY | Mahoning Valley Railway | Short Line | |
| MNRY | Maine Northern Railway | Short Line | |
| MANN | Manning Rail | Short Line | |
| MJ | Manufacturers' Junction Railway | Short Line | |
| MQT | Marquette Rail, LLC | Short Line | |
| MDDE | Maryland and Delaware Railroad | Short Line | |
| MMID | Maryland Midland Railway | Short Line | |
| MCER | Massachusetts Central Railroad | Short Line | |
| MC | Massachusetts Coastal Railroad | Short Line | |
| MSTR | Massena Terminal Railroad | Short Line | |
| PAM | McKees Rocks Railroad | Short Line | |
| MSN | Meeker Southern Railroad | Short Line | |
| MCVR | Merced County Central Valley Railroad | Short Line | |
| MDS | Meridian Southern Railway | Short Line | |
| MGRI | MG Rail, Inc. | Short Line | |
| MS | Michigan Shore Railroad | Short Line | |
| MSO | Michigan Southern Railroad | Short Line | |
| MMRR | Mid-Michigan Railroad | Short Line | |
| MIDH | Middletown and Hummelstown Railroad | Short Line | |
| MNJ | Middletown and New Jersey Railroad | Short Line | |
| MWS | Midway Southern Railway | Short Line | |
| MBRX | Milford-Bennington Railroad | Short Line | |
| MRAX | Mineral Range Railroad | Short Line | |
| MNNR | Minnesota Commercial Railway | Short Line | |
| MNN | Minnesota Northern Railroad | Short Line | |
| MPLI | Minnesota Prairie Line, Inc. | Short Line | |
| MDW | Minnesota, Dakota and Western Railway | Short Line | |
| MMT | Mission Mountain Railroad | Short Line | |
| MSCI | Mississippi Central Railroad | Short Line | |
| MSDR | Mississippi Delta Railroad | Short Line | |
| MSE | Mississippi Export Railroad | Short Line | |
| MSR | Mississippi Southern Railroad | Short Line | |
| MTNR | Mississippi Tennessee Railroad | Short Line | |
| MNA | Missouri and Northern Arkansas Railroad | Short Line | |
| MER | Missouri Eastern Railroad | Short Line | |
| MNC | Missouri North Central Railroad | Short Line | |
| MET | Modesto and Empire Traction Company | Short Line | |
| MHWA | Mohawk, Adirondack and Northern Railroad | Short Line | |
| ME | Morristown and Erie Railway | Short Line | |
| MCSA | Moscow, Camden and San Augustine Railroad | Short Line | |
| MVT | Mount Vernon Terminal Railway | Short Line | |
| MPR | Mountain Pacific Railroad | Short Line | |
| NDW | Napoleon, Defiance & Western Railroad | Short Line | |
| NTZR | Natchez Railway | Short Line | |
| NAUG | Naugatuck Railroad Company | Short Line | |
| NCRC | Nebraska Central Railroad | Short Line | |
| NKCR | Nebraska Kansas Colorado Railway | Short Line | |
| NNW | Nebraska Northwestern Railroad | Short Line | |
| NCIR | New Castle Industrial Railroad | Short Line |
Source: Wikipedia "List of United States railroads". 670 railroads indexed.