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 -
- MACX -
- MADU -
- MAEU - Maersk Lines
- MAGX -
- MAIX -
- MAJU - Malaysian International Shipping Corporation
- MALX -
- MALZ - American President Lines
- MANX - ;
- MAPX - ;
- MARX -
- MARZ -
- MASX - GE Rail Services
- MATU - Matson Navigation Company
- MATX -
- MATZ - Matson Navigation Company
- MAW - Maumee and Western Railroad
- MAXU -
- MAXX - MidAmerican Energy Company
- MAYW -
- MB - Meridian & Bigbee Railroad
- MBBX -
- MBCX -
- MBFX -
- MBIX -
- MBKX -
- MBLX - Exxon-Mobil Corporation
- MBPX -
- MBRR - Meridian & Bigbee Railroad
- MBSX -
- MBT -
- 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 - ;
- MCDX - ;
- MCER - Massachusetts Central Railroad
- MCEU - Massachusetts Central Railroad
- MCEZ - Massachusetts Central Railroad
- MCHX -
- MCIX - (Applied Chemicals Division)
- MCLR -
- MCLX -
- MCMU -
- MCMX -
- MCPX - Monsanto Company; Solutia
- MCR - McCloud River Railroad; McCloud Railway
- MCRR - Monongahela Connecting Railroad
- MCRX -
- MCRY -
- MCSA - Moscow, Camden and San Augustine Railroad
- MCSU - China Ocean Shipping Company
- MCTA -
- MCTX -
- MCVX - Massachusetts Call Volunteer Firefighters' Association
- MD -
- MDAX - Merchants Despatch Transportation Corporation
- MDCX -
- MDDE - Maryland and Delaware Railroad
- MDDX -
- MDIX -
- MDKX - ()
- MDLR -
- MDP - ()
- MDR - Kansas City Southern Railway
- MDS - Meridian Southern Railway
- MDSB - Burlington Northern Railroad
- MDSZ -
- 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 -
- MEFX -
- MEFZ -
- MELX -
- MEPX - McGraw-Edison Company
- MERR - Maine Eastern Railroad
- MERX -
- MESX -
- MET - Modesto and Empire Traction Company
- METW -
- METX - Northeast Illinois Regional Commuter Railroad Corporation (Metra)
- MF -
- MFCX - ; First Union Rail
- MFFX -
- MG -
- MGA - Monongahela Railway; Norfolk Southern
- MGGU -
- MGMX -
- MGRI -
- MGRS - Ferrocarriles Nacionales de Mexico
- MGSX - ;
- MH - Mount Hood Railroad
- MHAX - United States Department of the Interior ()
- MHCO -
- MHFX -
- MHLX - General American Transportation Corporation
- MHM - Norfolk Southern
- MHQU - Military Sealift Command (Washington, DC)
- MHQZ - Military Sealift Command
- MHRX -
- MHWA - Mohawk, Adirondack and Northern Railroad
- MI - Missouri-Illinois Railroad; Missouri Pacific Railroad; Union Pacific
- MICO - Midland Continental Railroad
- MID -
- MIDH - Middletown and Hummelstown Railroad
- MIDL - Midland Railway
- MIDX -
- MIEU -
- 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 -
- MINE -
- MINU - China Ocean Shipping Company
- MIPX -
- MIR - Minneapolis Industrial Railway
- MIRX -
- MIS - Mississippi Central Railroad
- MISS - Mississippian Railway Cooperative
- MISU - Malaysian International Shipping Corporation
- MISX -
- MJ - Manufacturers' Junction Railway
- MJRX -
- MJVU -
- MKC -
- MKCX - Morrison-Knudsen
- MKFX -
- 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 -
- MLEX - Miles
- MLHX - American Refrigerator Transit Company
- MLIX -
- MLLX - ,
- MLMX - ; Metal Management
- MLSX - Monsanto Company
- MLUX - Solutia
- MMA - Montreal, Maine & Atlantic Railway
- MMAC - Montreal, Maine & Atlantic Railway
- MMAX - ; Martin Marietta Corporation
- MMBX - Martin Marietta Corporation;
- MMCU -
- MMCX - ;
- MMID - Maryland Midland Railway
- MMMU -
- MMMX - Minnesota Mining and Manufacturing (3M)
- MMRR - Mid-Michigan Railroad
- MMRX -
- MMSX - Blue Circle
- MMXZ -
- MNA - Missouri & Northern Arkansas Railroad
- MNAX -
- MNBR - Meridian & Bigbee Railroad
- MNC -
- MNCW - Metro-North Commuter Railroad
- MNCX -
- 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 International
- MNRX - Northstar Line
- MNS - Minneapolis, Northfield and Southern Railway; Soo Line Railroad; Canadian Pacific Railway
- MNTX - Minnesota Transportation Museum
- MNWX - ()
- MOBX - Mobil Oil Corporation; Exxon-Mobil Corporation
- MOC - Missouri Central Railroad
- MOCX -
- MOD - Missouri Pacific Railroad
- MOEX -
- MOFX -
- MOGX -
- MOHX - Monsanto Company; Solutia
- MOLU - Mitsui OSK Lines
- MOLX -
- MON - Monon Railroad; Seaboard System Railroad; CSX Transportation
- MONX - Monsanto Company; Solutia
- MOPZ -
- MORZ - Mitsui OSK Lines
- MOSX -
- MOSZ - Mitsui OSK Lines
- MOT -
- MOTC -
- MOTU - Monsanto
- MOTX - Museum of Transportation
- MOTZ - Mitsui OSK Lines
- MOWX -
- MOXV -
- MP - Missouri Pacific Railroad; Union Pacific
- MPA - Maryland and Pennsylvania Railroad; York Railway
- MPCX - ;
- MPEX - MotivePower
- MPIT - Union Pacific
- MPIX - ; MotivePower
- MPLI - Minnesota Prairie Line
- MPLX - GE Rail Services
- MPLZ - Union Pacific
- MPRX -
- MPSX -
- MPTX - Procor
- MPU - Missouri Pacific Railroad, Union Pacific
- MPWX -
- MPZ - Union Pacific
- MQCX -
- MQGX -
- MQPX - Millennium Inorganic Chemicals
- MQT - Marquette Rail
- MR - McCloud River Railroad;
- MRAX - Mineral Range
- MRCX - ; GE Rail Services Corporation
- MRDX - MidAmerican Energy Company
- MREX - ;
- MRHS - Midland Railway
- MRI -
- MRIX -
- MRL - Montana Rail Link
- MRMX -
- MRMZ - Monticello Railway Museum
- MRR - Carolina Southern Railroad
- MRRX - GE Rail Services;
- MRS - Manufacturers Railway Company; Anheuser-Busch
- MRSX -
- 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,
- MSE - Mississippi Export Railroad
- MSEX - Princess Tours
- MSIX - Morton International
- MSL -
- MSLC -
- MSMX -
- MSN - Meeker Southern Railroad
- MSO - Michigan Southern Railroad
- MSPX -
- MSQU - Military Sealift Command (Bayonne, New Jersey)
- MSR - (Watco)
- MSRC - Kansas City Southern Railway (former MidSouth Railcorp)
- MSRW - Mississippian Railway Cooperative
- MSTL - Minneapolis and St. Louis Railway; Chicago & North Western Railway; Union Pacific
- MSTR - Massena Terminal Railroad
- MSUU -
- MSV - Mississippi and Skuna Valley Railroad
- MSWY - Minnesota Southern Railway
- MT - Mississippi and Tennessee RailNet
- MTAX -
- MTC -
- MTCO -
- MTCX -
- MTCZ -
- MTDX -
- MTFR - Minnesota Transfer Railway
- MTIU -
- MTIZ -
- MTLU -
- MTLX -
- MTMU - March
- MTMX -
- MTNX -
- MTPX - Montana Power Company
- MTR - Montour Railroad; Youngstown and Southeastern Railroad
- MTRX -
- MTSU -
- MTTX - Trailer Train Company; TTX Company
- MTW -
- MTZ - Mitsui OSK Lines
- MULX -
- MUSC -
- MV - Midland Valley Railroad
- MVCX -
- MVP -
- MVRY - Mahoning Valley Railway
- MVT -
- MWAX - Martin Marietta Materials
- MWBX -
- MWCL -
- MWCX -
- MWHX -
- MWLX -
- MWLZ -
- MWMX - ;
- MWPX -
- MWR -
- MWRC - Mount Washington Railway
- MWRL - Molalla Western Railway;
- MWRR - Montana Western Railway
- MWRX -
- MWSX - ; GE Rail Services
- MWTT -
- MXLU -
- MZIZ -
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