List of reporting marks: M

Note: Marks ending in U are for container owners; marks ending in X are not common carriers; marks ending in Z are for trailers without flanged wheels. All other marks are of common-carrier railroads.

M

• MAA - Magma Arizona Railroad
• MAAX - Maxx Leasing Company
• MACX - Mac Acquisitions
• MADU - Magnum Speditionsgelleshaft
• MAEU - Maersk Lines
• MAGX - Magnimet, Monroe Scrap Division
• MAIX - Macon Iron and Paper Stock
• MAJU - Malaysian International Shipping Corporation
• MALX - Mid-America Locomotive and Car Repair
• MALZ - American President Lines
• MANX - Manchester Gas Company; Williams Energy Ventures
• MAPX - MAPCO Products Company; Williams Energy Ventures
• MARX - MidAmerican Energy Corporation
• MARZ - MARTRAC
• MASX - GE Rail Services
• MATU - Matson Navigation Company
• MATX - Merchants Investment Company
• MATZ - Matson Navigation Company
• MAW - Maumee and Western Railroad
• MAXU - Maxu Containers
• MAXX - MidAmerican Energy Company
• MAYW - Maywood and Sugar Creek
• MB - Meridian & Bigbee Railroad
• MBBX - Tank Car Services
• MBCX - MBCX Leasing
• MBFX - MBF Industries
• MBIX - Morse Brothers
• MBKX - MRC Rail Services
• MBLX - Exxon-Mobil Corporation
• MBPX - MacMillan-Bloedell
• MBRR - Meridian & Bigbee Railroad
• MBSX - Mid-South Bulk Services
• MBT - Marianna and Blountstown Railroad
• MBTX - Massachusetts Bay Transportation Authority
• MC - Michigan Central Railroad; New York Central Railroad; Penn Central; Maine Coast Railroad (1991-2000); Massachusetts Coastal Railroad (2007-)
• MCCX - Mount Vernon Coal Transfer Company; Mount Vernon Transfer Terminal
• MCDX - Redland Worth Corporation; Sunbelt Cement
• MCER - Massachusetts Central Railroad
• MCEU - Massachusetts Central Railroad
• MCEZ - Massachusetts Central Railroad
• MCHX - Trinity Rail Management
• MCIX - Mobley Company (Applied Chemicals Division)
• MCLR - McLaughlin Line Railroad
• MCLX - Morrison Car Leasing
• MCMU - Management Control and Maintenance
• MCMX - MC Rail Services
• MCPX - Monsanto Company; Solutia
• MCR - McCloud River Railroad; McCloud Railway
• MCRR - Monongahela Connecting Railroad
• MCRX - Marcus Rail Transport
• MCRY - Mid Continent Railway
• MCSA - Moscow, Camden and San Augustine Railroad
• MCSU - China Ocean Shipping Company
• MCTA - Minnesota Central Railroad
• MCTX - Modern Continental Construction Company
• MCVX - Massachusetts Call Volunteer Firefighters' Association
• MD - Municipal Docks
• MDAX - Merchants Despatch Transportation Corporation
• MDCX - Mexicana De Cobre, SA de CV
• MDDE - Maryland and Delaware Railroad
• MDDX - Old Line Holding Company
• MDIX - Modern Dispersions
• MDKX - Gardau MRM Steel (Mandak Metal Processors Division)
• MDLR - Midland Terminal Company
• MDP - Mexican Pacific Railroad (Ferrocarril Mexicano del Pacifico)
• MDR - Kansas City Southern Railway
• MDS - Meridian Southern Railway
• MDSB - Burlington Northern Railroad
• MDSZ - Medspan Shipping Service
• MDT - Merchants Despatch Transportation Corporation
• MDTX - Merchants Despatch Refrigerator Line
• MDW - Minnesota, Dakota & Western Railway
• MDWU - Minnesota, Dakota & Western Railway
• MDWZ - Minnesota, Dakota & Western Railway
• ME - Morristown & Erie Railway
• MEC - Maine Central Railroad; Pan Am Railways
• MECX - Trinity Rail Management
• MEDU - Mediterranean Shipping Company
• MEFX - MexFresh
• MEFZ - MexFresh
• MELX - Sunbelt Cement
• MEPX - McGraw-Edison Company
• MERR - Maine Eastern Railroad
• MERX - Merco
• MESX - Mears/CPG
• MET - Modesto and Empire Traction Company
• METW - Municipality of East Troy Wisconsin
• METX - Northeast Illinois Regional Commuter Railroad Corporation (Metra)
• MF - Middle Fork Railroad
• MFCX - Farmers Coop Grain and Supply Company; First Union Rail
• MFFX - M4 Holdings
• MG - Mobile and Gulf Railroad
• MGA - Monongahela Railway; Norfolk Southern
• MGGU - Marcevaggi
• MGMX - J and J Partnership
• MGRI - MG Rail
• MGRS - Ferrocarriles Nacionales de Mexico
• MGRX - M&G Resins USA, LLC
• MGSX - Martin Gas Sales; CF Martin Sulphur
• MH - Mount Hood Railroad
• MHAX - United States Department of the Interior (Bureau of Mines Helium Field Operations)
• MHCO - Marquette and Huron Mountain Railroad
• MHFX - MHF Logistical Solutions
• MHLX - General American Transportation Corporation
• MHM - Norfolk Southern
• MHQU - Military Sealift Command (Washington, DC)
• MHQZ - Military Sealift Command
• MHRX - Mile-High Railcar Services
• MHWA - Mohawk, Adirondack and Northern Railroad
• MI - Missouri-Illinois Railroad; Missouri Pacific Railroad; Union Pacific
• MICO - Midland Continental Railroad
• MID - Midway Railroad
• MIDH - Middletown and Hummelstown Railroad
• MIDL - Midland Railway
• MIDX - MRC Rail Services
• MIEU - MI Engineering
• MIGN - Michigan Northern Railway
• MILW - Milwaukee Road; Soo Line Railroad; Canadian Pacific Railway
• MILX - Milchem; GE Rail Services Corporation
• MILZ - Soo Line Railroad, Canadian Pacific Railway
• MIMX - Minera Mexico International
• MINE - Minneapolis Eastern Railway
• MINU - China Ocean Shipping Company
• MIPX - Millennium Petrochemicals
• MIR - Minneapolis Industrial Railway
• MIRX - Regional Recycling
• MIS - Mississippi Central Railroad
• MISS - Mississippian Railway
• MISU - Malaysian International Shipping Corporation
• MISX - Milwaukee Solvents and Chemicals Corporation
• MJ - Manufacturers' Junction Railway
• MJRX - M Ryan Railway Service Contractors
• MJVU - Merco
• MKC - McKeesport Connecting Railroad
• MKCX - Morrison-Knudsen
• MKFX - Century Rail Enterprises
• MKIX - M-K Railroad Equipment Leasing Company; Morrison-Knudsen
• MKNR - Mackenzie Northern Railway
• MKT - Missouri-Kansas-Texas Railroad; Union Pacific
• MKTT - Missouri-Kansas-Texas Railroad; Union Pacific
• MKTZ - Union Pacific
• MLCU - NYK Line
• MLCX - American Refrigerator Transit Company
• MLD - Midland Railway Co. of Manitoba
• MLEX - Miles
• MLHX - American Refrigerator Transit Company
• MLIX - Melbo Land and Investment Company
• MLLX - Montell USA, Basell USA
• MLMX - Morrison Grain Company; Metal Management
• MLSX - Monsanto Company
• MLUX - Solutia
• MMA - Montreal, Maine & Atlantic Railway
• MMAC - Montreal, Maine & Atlantic Railway
• MMAX - Martin Marietta Aluminum; Martin Marietta Corporation
• MMBX - Martin Marietta Corporation; Master Builders
• MMCU - CIE Des Messageries Maritimes
• MMCX - M&M Chemical Products; TransMatrix
• MMID - Maryland Midland Railway
• MMMU - Fesco Pacific Lines
• MMMX - Minnesota Mining and Manufacturing (3M)
• MMRR - Mid-Michigan Railroad
• MMRX - Double M Ranch Enterprises
• MMSX - Blue Circle
• MMXZ - Murphy Motor Express
• MNA - Missouri & Northern Arkansas Railroad
• MNAX - C and S Directional Boring
• MNBR - Meridian & Bigbee Railroad
• MNC - Missouri North Central Railroad
• MNCW - Metro-North Commuter Railroad
• MNCX - Minnesota Corn Processors
• MNJ - Middletown and New Jersey Railway
• MNLU - Malaysian International Shipping Corporation
• MNLX - Exxon-Mobil Corporation
• MNN - Minnesota Northern Railroad
• MNNR - Minnesota Commercial Railway
• MNPX - Morton Norwich Products; Morton International
• MNRX - Northstar Line
• MNS - Minneapolis, Northfield and Southern Railway; Soo Line Railroad; Canadian Pacific Railway
• MNTX - Minnesota Transportation Museum
• MNWX - Minnesota Department of Public Service (Weights and Measures Division)
• MOBX - Mobil Oil Corporation; Exxon-Mobil Corporation
• MOC - Missouri Central Railroad
• MOCX - Missouri Portland Cement Company
• MOD - Missouri Pacific Railroad
• MOEX - Morgan Engineering
• MOFX - Maxton Oil and Fertilizer Company
• MOGX - C.W. Brooks
• MOHX - Monsanto Company; Solutia
• MOLU - Mitsui OSK Lines
• MOLX - International Molasses Corporation
• MON - Monon Railroad; Seaboard System Railroad; CSX Transportation
• MONX - Monsanto Company; Solutia
• MOPZ - Flexi-Van Leasing
• MORZ - Mitsui OSK Lines
• MOSX - Mosinee Paper Corporation
• MOSZ - Mitsui OSK Lines
• MOT - Marine Oil Transportation
• MOTC - Montreal Tramways
• MOTU - Monsanto
• MOTX - National Museum of Transportation
• MOTZ - Mitsui OSK Lines
• MOWX - Fortaleza Construction Company
• MOXV - Moxahala Valley Railway
• MP - Missouri Pacific Railroad; Union Pacific
• MPA - Maryland and Pennsylvania Railroad; York Railway
• MPCX - Moyer Packing Company; Michels Pipeline Construction
• MPEX - MotivePower
• MPIT - Union Pacific
• MPIX - Myer's Propane Gas Service; MotivePower
• MPLI - Minnesota Prairie Line
• MPLX - GE Rail Services
• MPLZ - Union Pacific
• MPRX - Motive Power & Equipment Solutions
• MPSX - Missouri Public Service
• MPTX - Procor
• MPU - Missouri Pacific Railroad, Union Pacific
• MPWX - Muscatine Power and Water
• MPZ - Union Pacific
• MQCX - Monarch Cement Company
• MQGX - Morrison-Quirk Grain Corporation
• MQPX - Millennium Inorganic Chemicals
• MQRX - Macquarie Rail, Inc.; Wells Fargo Rail
• MQT - Marquette Rail
• MR - McCloud River Railroad; McLeod Railway
• MRAX - Mineral Range
• MRCX - Evans Railcar Leasing Company; GE Rail Services Corporation
• MRDX - MidAmerican Energy Company
• MREX - Marshall Railway Equipment Corporation; Monad Railway Equipment Company
• MRHS - Midland Railway
• MRI - Mohall Railroad
• MRIX - Motive Rail Industries
• MRL - Montana Rail Link
• MRMX - Midwest Railcar Corporation (previously named MRM Leasing and Management)
• MRMZ - Monticello Railway Museum
• MRR - Carolina Southern Railroad
• MRRX - GE Rail Services; Murphy Road Recycling
• MRS - Manufacturers Railway Company; Anheuser-Busch
• MRSX - Mile-High Railcar Services
• MS - Michigan Shore Railroad
• MSAZ - National Motor Freight Traffic Association
• MSC - Illinois Central Gulf Railroad (Mississippi Central, Hattiesburg to Natchez)
• MSCI - Mississippi Central Railroad (Oxford to Grand Jct)
• MSCU - Mediterranean Shipping Company
• MSCZ - Mediterranean Shipping Company
• MSDR - Mississippi Delta Railroad, Rock Island Rail
• MSDU - Mediterranean Shipping Company
• MSE - Mississippi Export Railroad
• MSEX - Princess Tours
• MSIX - Morton International
• MSKU - Maersk Line
• MSL - Montgomery Short Line
• MSLC - Minnesota Short Lines Company
• MSMU - Mediterranean Shipping Company
• MSMX - Mid South Milling Company
• MSN - Meeker Southern Railroad
• MSO - Michigan Southern Railroad
• MSPX - P4 Productions
• MSQU - Military Sealift Command (Bayonne, New Jersey)
• MSR - Mississippi Southern Railroad (Watco)
• MSRC - Kansas City Southern Railway (former MidSouth Railcorp)
• MSRW - Mississippian Railway
• MSTL - Minneapolis and St. Louis Railway; Chicago & North Western Railway; Union Pacific
• MSTR - Massena Terminal Railroad
• MSTX - Steam Railroading Institute
• MSUU - USPCI
• MSV - Mississippi and Skuna Valley Railroad
• MSWY - Minnesota Southern Railway
• MT - Mississippi and Tennessee RailNet
• MTAX - MTAX Corporation
• MTC - Mystic Terminal Company
• MTCO - Macon Terminal Company
• MTCX - Mallard Transportation Company
• MTCZ - Mayflower Transit and Storage
• MTDX - Midwest Transportation and Development Company
• MTFR - Minnesota Transfer Railway
• MTIU - Welfit Oddy
• MTIZ - American Marine Industries
• MTLU - Montgomery Tank Lines
• MTLX - Metal Link International
• MTMU - March
• MTMX - Modern Track Machinery
• MTNX - Rocky Mountain Transportation Services
• MTPX - Montana Power Company
• MTR - Montour Railroad; Youngstown and Southeastern Railroad
• MTRX - TransMatrix
• MTSU - Marine Transport Service
• MTTX - Trailer Train Company; TTX Company
• MTW - Marinette, Tomahawk and Western Railroad
• MTZ - Mitsui OSK Lines; Montgomery Tank
• MTZX - Mitsui Rail Capital LLC
• MULX - MUL Railcars Leasing LLC
• MUSC - Memphis Union Station Company
• MV - Midland Valley Railroad
• MVCX - Chaparral Energy
• MVP - Missouri and Valley Park Railroad
• MVRY - Mahoning Valley Railway
• MVT - Mount Vernon Terminal
• MWAX - Martin Marietta Materials
• MWBX - Midwest By-Products Company
• MWCL - Midwest Coal Handling
• MWCX - Midwest Railcar Corporation
• MWHX - Markwest Hydrocarbon Partners
• MWLX - Midwest Locomotive Leasing and Sales
• MWLZ - Madrigal-Wan Hai Lines Corporation
• MWMX - Midwest Mud Company; Golden Leasing
• MWPX - Murco Wall Products
• MWR - Muncie and Western Railroad
• MWRC - Mount Washington Railway
• MWRL - Molalla Western Railway; Hillvista Investment Company
• MWRR - Montana Western Railway
• MWRX - Midwest Rail
• MWSX - Midwest Solvents Company; GE Rail Services
• MWTT - Michigan-Wisconsin Transportation Company
• MXLU - Mexican Line
• MZIZ - Marko B Zanovich

1. List of reporting marks: A
2. Reporting mark
3. List of reporting marks: T
4. List of reporting marks: G
5. List of reporting marks: J
6. Marks & Spencer
7. List of Marks & Spencer brands
8. List of M*A*S*H episodes
9. 5000 metres
10. DMARC
11. Quotation mark
12. List of Star Trek characters (G–M)
13. Scam
14. List of NATO reporting names for miscellaneous aircraft
15. 100 metres
16. Mark Wahlberg
17. Athing Mu
18. Global Reporting Initiative
19. List of reported UFO sightings
20. Credit bureau