Railroad Transportation Service Companies
| Metra-Metropolitan Rail (Palatine, IL)
Primarily Serving: Arlington Heights, IL - Hoffman Estates, IL - Schaumburg, IL - Mount Prospect, IL |
| Metroplex Corp (Eighty Four, PA)
Primarily Serving: Pittsburgh, PA - Youngstown, OH - Canton, OH - Akron, OH |
| Michigan Shore Railroad (Vassar, MI)
Primarily Serving: Saginaw, MI - Flint, MI - Waterford, MI - Pontiac, MI |
| Mid America Rail & Storage (Charlestown, IN)
Primarily Serving: Louisville, KY - Lexington, KY - Bloomington, IN - Cincinnati, OH |
| Middletown & Hummelstown Co (Middletown, PA)
Primarily Serving: Lancaster, PA - Reading, PA - Towson, MD - Baltimore, MD |
| Middletown & Nj Ry Co (Middletown, NY)
Primarily Serving: Wayne, NJ - Paterson, NJ - Clifton, NJ - Passaic, NJ |
| Midwest Railcare (Oelwein, IA)
Primarily Serving: Waterloo, IA - Cedar Rapids, IA - Dubuque, IA - Iowa City, IA |
| Minnesota Commercial Railway (Libertyville, IL)
Primarily Serving: Waukegan, IL - Palatine, IL - Arlington Heights, IL - Mount Prospect, IL |
| Minnesota Southern Railway (Luverne, MN)
Primarily Serving: Sioux Falls, SD - Sioux City, IA - Eden Prairie, MN - Lakeville, MN |
| Miss & Skuna Valley Railroad (Bruce, MS)
Primarily Serving: Memphis, TN - Jackson, TN - Tuscaloosa, AL - Jackson, MS |
| Mississippi Southern Railroad (Bay Springs, MS)
Primarily Serving: Hattiesburg, MS - Jackson, MS - Gulfport, MS - Mobile, AL |
| Missouri & Northern Ar (Galena, MO)
Primarily Serving: Springfield, MO - Rogers, AR - Springdale, AR - Joplin, MO |
| Missouri & Northern Arkansas (Batesville, AR)
Primarily Serving: Jonesboro, AR - Conway, AR - North Little Rock, AR - Little Rock, AR |
| Missouri & Northern Arkansas (Aurora, MO)
Primarily Serving: Springfield, MO - Rogers, AR - Joplin, MO - Springdale, AR |
| Missouri Kansas Texas Railroad (Temple, TX)
Primarily Serving: Killeen, TX - Waco, TX - Georgetown, TX - Round Rock, TX |
| Missouri North Central (Chillicothe, MO)
Primarily Serving: Independence, MO - Blue Springs, MO - Saint Joseph, MO - Kansas City, MO |
| Missouri Pacific Railroad (Weeping Water, NE)
Primarily Serving: Bellevue, NE - Omaha, NE - Lincoln, NE - Council Bluffs, IA |
| Mo Pacific Railroad (Topeka, KS)
Primarily Serving: Lawrence, KS - Olathe, KS - Shawnee, KS - Manhattan, KS |
| Montana Rail Link (Big Timber, MT)
Primarily Serving: Billings, MT - Great Falls, MT - Idaho Falls, ID - Missoula, MT |
| Montana Rail Link (Drummond, MT)
Primarily Serving: Missoula, MT - Great Falls, MT - Spokane, WA - Idaho Falls, ID |
| Montana Rail Link (Clark Fork, ID)
Primarily Serving: Spokane, WA - Missoula, MT - Pasco, WA - Kennewick, WA |
| Montana Rail Link Inc (Missoula, MT)
Primarily Serving: Great Falls, MT - Spokane, WA - Pasco, WA |
| Montana Rail Link Maintance (Plains, MT)
Primarily Serving: Missoula, MT - Spokane, WA - Great Falls, MT - Pasco, WA |
| N J Transit Rail (Morristown, NJ)
Primarily Serving: Union, NJ - Irvington, NJ - East Orange, NJ - Wayne, NJ |
| Nash County Railroad (Rocky Mount, NC)
Primarily Serving: Greenville, NC - Raleigh, NC - Cary, NC - Durham, NC |
