M & G Inc.	GMGX	added 1/2001; eliminated 4/2001
M & G Polymers U.S.A. LLC	GMGX	added 4/2001
M & M Chemical Products, Inc.	MMCX	added 7/77; 1/80; eliminated 7/89
M&B R.R., L.L.C.	MB	added 10/97; 7/2000
	MNBR	added 10/97; 7/2000
M&C Railcar Leasing, L.L.C.	JDSX	added 1/97; 7/2000
M. Corp. Management Solutions, Inc.	BRKX	added 10/89; eliminated 4/90
M. Steffen & Co., Inc.	STX	1/52-4/61
M.B. Suydam Co.	MBSX	Apr-38
M.B. Suydam Division, Pittsburgh Plate Glass Co.	MBSX	1/52; eliminated 4/54
M.B.C.X. Leasing, L.L.C.	MBCX	added 7/98; 7/2000
M4 Holdings Ltd.	MFFX	added 4/85; eliminated 1/92; 1/94-7/2000
Mac Acquisitions, L.P.	MACX	added 10/96; 7/2000
Mackinac Transportation Co.	MCTR	Jan-75
MacMillan-Bloedel Inc.	MBPX	added 4/73; 1/75-1/94; eliminated 1/98; 7/2000
MacMillan-Bloedel Products, Inc.	MBPX	added 10/71; eliminated 4/73
Macon Terminal Co.	MTCO	1/75-7/2000
Macon, Dublin & Savannah R.R. Co.	MD&S	4/38-10/57
Madison Coal Corp.	MCCX	eliminated 7/63
	MCCX	Apr-61
Madison R.R., Division of City of Madison Port Authority	CMPA	added 1/79; 1/80; eliminated 7/90; 1/94-7/2000
Madison Ry. Co., Inc.	MDRY	added 1/78; eliminated 1/79
Maersk, Inc.	MAEX	added 7/90; eliminated 4/93; 1/94
Magma Arizona R.R. Co.	MAA	1/75-1/80; eliminated 1/94; 7/2000
Magma Metals Co.	PVCX	added 4/93; 1/94; eliminated 10/96
Magnetic Pigment Co.	MPX	Apr-38
Magnimet, Monroe Scrap Division (interplant service)	MAGX	1/80-1/94
Magnolia Petroleum Co.	MPCX	4/38-10/57; eliminated 1/60
Magor Car Corp.	MACX	7/65-10/66; eliminated 10/67
Magor Railcar Division, Fruehauf Corp.	MACX	added 7/68; 4/70
Mahanoy and Hazleton Ry., Inc.	MHRR	eliminated 10/86
Maine Central R.R. Co.	MEC	4/38-1/94; eliminated 4/97; added 7/98; 7/2000
Maine Coast R.R. Corp.	MC	added 10/92; eliminated 10/93; 1/94; eliminated 1/97; added 10/99; 7/2000
Maine Sugar Industries, Inc.	MSIX	Apr-70
Maintenance Inc.	MNCX	10/57-4/61; eliminated 4/62
Mallard Transportation Co.	MTCX	7/65-7/2000
Manchester Gas Co.	MANX	added 4/74; 1/75-1/80; eliminated 4/89
Mandak Metal Processors Division of Gerdau MRM Steel Inc.	MDKX	Jul-00
Mangels, Herold Co., Inc.	MHTX	4/38-10/57
Mangum Oil & Gas Co.	MOGX	added 4/88; eliminated 7/93
Manistee & Northeastern Ry. Co.	M&NE	4/38-1/52
Manistique & Lake Superior R.R.	MLS	4/38-10/66
Manufacturers' Junction Ry. Co.	MJ	4/38-7/2000
Manufacturers Leasing Corp.	DYLX	Apr-61
Manufacturers Leasing Corp.	DYLX	added 1/62; 7/65-1/80; eliminated 4/84
	KEBX	added 4/62; 7/65-1/80; eliminated 4/84
Manufacturers Ry. Co.	MRS	Apr-38
	MRS	10/57-7/2000
Manufacturers Ry. Co. of St. Louis	MRS	Jan-52
Mapco Gas Products, Inc.	MAPX	eliminated 10/93
Mapco Petroleum, Inc.	MAPX	added 4/85
	MAPX	added 10/93; 1/94; eliminated 10/99
Mapco Products Co.	MAPX	added 10/80; eliminated 4/85
Maple Leaf Mills Ltd.	TORX	7/65-1/75; eliminated 7/77
Marathon Ashland Petroleum LLC	AOIX	added 1/99; 7/2000
Marathon Corp.	MPMX	1/52-10/57
Marathon Leasing Co.	RTMX	added 10/70
Marathon Paper Mills Co.	MPMX	Apr-38
Marathon, a Division of American Can Co.	MPMX	eliminated 7/59
Marcus Rail Transport, L.L.C.	MCRX	Jul-00
Marcus-Ruth-Jerome Co.	MRJX	Apr-38
Marden-Wild Corp.	MWKX	1/52-4/61
Marfax Steel and Railway Equipment Co.	MFCX	added 10/67; 4/70; eliminated 7/70
Marhoefer Packing Co., Inc.	MPKX	4/70; eliminated 7/73
	MPLX	added 1/69
Marianna & Blountstown R.R.	M&BT	Apr-38
Marianna & Blountstown R.R. Co.	MBT	added 11/73; 1/75-1/80
Marine Oil Transportation	MOT	1/75-7/2000
Marinette, Tomahawk & Western R.R. Co.	MTW	1/75-1/80; eliminated 4/92
Mark Twain Marine Industries, Inc.	LSSX	added 10/69; 4/70; eliminated 7/74
Markwest Hydrocarbon Partners, Ltd.	MWHX	added 1/93; 1/94-7/2000
Marquette & Huron Mountain R.R. Co., Inc.	MHCO	1/75-1/80
Marquette Co.	MQCX	added 7/76; eliminated 1/79
Marquette Co., a subsidiary of Gulf & Western Industries, Inc.	MQCX	added 1/79; 1/80; eliminated 4/80
Mars Inc.	MWEX	Apr-38
	TMX	Apr-38
Marshall Railway Equipment Corp.	MREX	added 7/56; 10/57-1/80; eliminated 10/87
Martin Gas Sales, Inc.	MGSX	added 1/81; 1/94-7/2000; eliminated 4/2001
Martin Marietta Aluminum Inc.	MMAX	added 7/82; eliminated 1/85
Martin Marietta Cement, Division of Martin Marietta Corp.	MMSX	added 1/75; 1/75; eliminated 1/79
Martin Marietta Corp.	MMAX	added 4/85; 1/94; eliminated 7/97; 7/2000
	MMBX	added 1/79; 1/80; eliminated 7/86
	MMSX	added 1/79; 1/80
	DRCX	added 1/79; 1/80; eliminated 7/86
	HCTX	added 4/90; 1/94; eliminated 7/96; 7/2000
Martin Marietta Materials, Inc.	MWAX	added 7/97; 7/2000
Martin Oil Service, Inc.	MOSX	1/52-10/66; eliminated 7/67
Martin-Marietta Cement, Division of Martin-Marietta Corp.	DPCX	added 10/72; 1/75; eliminated 1/79
	DPLX	added 10/72; 1/75; eliminated 1/79
	DRCX	added 10/72; 1/75; eliminated 1/79
Martin-Marietta Corp.	DPCX	added 1/79; 1/80
	DPLX	added 1/79; 1/80
Marubeni America Corp.	KATX	eliminated 10/87
Maryland & Pennsylvania R.R.	M&PA	4/38-10/66
Maryland & Pennsylvania R.R. Co.	M&PA	Apr-70
	MPA	1/75-1/94; eliminated 4/2000
Maryland and Delaware R.R. Co.	MDDE	added 1/78; 1/80; eliminated 10/87; 1/94-7/2000
Maryland Midland Ry., Inc.	MMID	added 1/81; added 4/81; 1/94-7/2000
Massachusetts Call/Volunteer Firefighters Association	MCVX	Jul-00
Massachusetts Central	MCER	1/80-1/94
Massachusetts Central R.R.	MCER	added 4/95; 7/2000
Master Builders, Inc.	MMBX	added 10/87; 1/94; eliminated 10/95; added 10/96; eliminated 1/97; 7/2000
Master Lubricants Co.	MLX	4/38-4/61; eliminated 7/63
Material Brokerage Co.	MBCX	added 10/96; eliminated 7/98
Mather Refrigerator Express (Mather Stock Car Co.)	MRRX	Apr-38
	MUNX	Apr-38
Mather Stock Car Co.	MARX	added 10/53; eliminated 7/55
	MCAX	4/38-1/52; eliminated 7/55
	MORX	1/52; eliminated 7/55
	MRX	eliminated 7/55
	MSCX	4/38-1/52; eliminated 7/55
	MTX	eliminated 7/55
	MUNX	Jan-52
	GSX	Jan-52
	HPAX	Jan-52
	RPRX	eliminated 7/55
	MRRX	1/52; eliminated 7/55
Mathieson Chemical Corp.	MAWX	Jan-52
	SASX	Jan-52
Matthieson & Hegeler Zinc Co.	MHZX	4/38-1/52
Maumee & Western R.R. Corp.	MAW	added 7/98; 7/2000
Max Transportation Service	MTSX	7/65-4/70; eliminated 7/73
Maxton Oil & Fertilizer Co.	MOFX	added 7/65; 7/65-1/80; eliminated 1/91; 1/94-7/2000
Maxx Leasing Co.	MAAX	added 1/81; eliminated 10/88
Maywood & Sugar Creek	MAYW	1/80-7/2000
MBF Industries, Inc.	MBFX	added 7/79; 1/80; eliminated 7/91
McCall Farm Chemicals, Inc.	MCFX	eliminated 4/55
McCloud River R.R. Co.	MR	4/38-1/80; eliminated 7/92
McCloud River Ry. Co.	MCR	1/75-1/80
McCloud Ry. Co.	MCR	1/94-7/2000
	MR	added 7/92; 1/94-7/2000
McColl-Frontenac Oil Co., Ltd.	MFLX	4/38-1/52
McCook Rendering Co.	MCRX	10/57; eliminated 1/58
McCook Rendering Plant	MCRX	Jan-52
McCormick, Ashland City & Nashville R.R. Inc.	MACO	added 10/88; eliminated 1/93
McDonnell Douglas Corp.	DCCX	added 10/70; 1/75-1/80; eliminated 4/89; added 4/90; 1/94-7/2000
McDonough Brothers, Inc.	MCDX	added 7/78; 1/80; eliminated 10/83
McGoldrick Lumber Co.	MGLX	Apr-38
McGraw-Edison Co.	MEPX	added 4/69; 4/70-1/80; eliminated 10/93; 1/94-7/2000
McKeesport Connecting R.R. Co.	MKC	1/52-7/2000
McKenzie Tank Lines, Inc.	MTLX	eliminated 4/65; 7/65
McKesson & Robbins, Inc.	BPCX	eliminated 7/65
McLaughlin Line R.R.	MCLR	added 7/88; eliminated 1/92; 1/94-7/2000
McMaster Grain Co.	SSGX	added 5/83; eliminated 4/90
Mears/CPG, Inc.	MESX	added 7/98; 7/2000
Mechling Bros. Chemicals, a Division of General Chemical Co.	MBX	Apr-38
Mells Cargo Supply, Inc.	MCSX	Jan-94
Melwire Inc.	MELX	eliminated 4/91
Memphis Union Station Co.	MUSC	1/75-7/2000
Mercantile Refrigerator Line (Merchants Despatch Transportation Corp.)	MERX	1/52-10/57
Mercersburg Ry., Inc.	MERW	added 4/79; 1/80; added 7/80; eliminated 1/81
Merchants Despatch Transporation Corp.	HNZX	added 7/55; 10/57-4/70; eliminated 10/71
Merchants Despatch Transportation Co.	MDAX	added 1/62; 7/65-1/80
	MDFX	added 1/62
	MDSX	added 7/55
	MDT	4/38-1/80; eliminated 1/83
	MERX	4/61-4/70; eliminated 1/73
	MIDX	7/65-4/70; eliminated 1/73
	MLKX	1/52-4/70; eliminated 10/70
	MRBX	added 10/53; 10/57-4/70; eliminated 7/70
	ERDX	1/52-1/80; eliminated 10/84
	ESGX	added 4/57; 10/57-10/66; added 4/68; 4/70
	QMRX	10/57-7/65; eliminated 7/66
	ABCX	added 7/66; 10/66-4/70; eliminated 1/73
	MDTX	added 7/89; 1/94; eliminated 7/99
	MFVX	added 4/65; 7/65-1/75; eliminated 4/76; 1/80
	MSGX	10/57-7/65; eliminated 10/65
	APPX	1/52-10/66; eliminated 7/67
	BVDX	1/52-4/61
	CDCX	added 7/55; 10/57-10/66; eliminated 7/69
	DICX	1/52-7/65
	DICX	Apr-70
	DICX	1/75-1/80; eliminated 1/80
	DRYX	added 10/60; 4/61
	DUFX	1/52; eliminated 4/54
	ESHX	7/65; eliminated 7/65
	GFCX	added 10/60; 4/61-1/80; eliminated 1/82
	HRIX	10/57-10/66; eliminated 10/69
	IBPX	4/61-4/70; eliminated 1/73
	IMCX	added 4/62
Merchants Despatch Transportation Corp.	NCGX	7/65-10/66; eliminated 7/68
	NCSX	7/65-10/66; eliminated 7/67
	NDIX	added 7/56; 10/57; eliminated 7/60; 4/61
	NHIX	7/65; eliminated 7/66
	NMCX	7/65-10/66; eliminated 4/67; 4/70
	NPMX	Oct-57
	NRBX	7/65-1/94; eliminated 7/99
	NRC	7/65-1/80; eliminated 1/83
	NYMX	10/57-1/75; eliminated 7/79
	NYRB	added 1/58; eliminated 7/59
	NYRX	added 1/59; 4/61-1/75; eliminated 7/79
	OHPX	10/57-4/61
	PVYX	added 1/69; 4/70-1/80; eliminated 10/84
	RSGX	10/57-1/75; eliminated 7/79
	SUCX	10/57-4/70
	WMRX	10/57-10/66; eliminated 10/69
Merchants Investment Co.	MATX	added 4/75; 1/80; eliminated 1/89
	CREX	7/65-1/80; eliminated 1/89
	JTHX	added 7/84; eliminated 1/89
Merco, A Joint Venture	MERX	1/94; added 1/97; 7/2000
Meridian & Bigbee R.R. Co.	MB	1/75-1/94; eliminated 10/97
	MBRR	1/75-1/80
Meridian Southern Ry., L.L.C.	MDS	Jul-00
Merrimac Chemical Co. -- Monsanto Chemical Co., Merrimac Division	MCHX	Apr-38
Metal & Thermit Corp.	GDX	Apr-38
Metal-Matic, Inc.	MMIX	added 7/73; 1/75-1/80; eliminated 4/84
Metalurgica Mexicana Penoles, S.A.	PENX	7/65-1/75; eliminated 7/76
Metro-North Commuter R.R.	MNCW	1/94-7/2000
Metropolitan Sanitary District of Greater Chicago	CSDX	added 7/56; 10/57-1/80; eliminated 10/89
Metropolitan Water Reclamation District of Greater Chicago	CSDX	added 10/89; 1/94; eliminated 10/94; added 10/96; eliminated 1/97; 7/2000
Mexican Pacific R.R. Co., Inc. (Ferrocarril Mexicano del Pacifico, S.A.)	MDP	1/75-1/80
Mexican Pacific R.R. Co., Inc. (transferred to Ferrocarriles Nacionales de Mexico)	MDP	eliminated 10/88
Mexican Petroleum Corp.	MPLX	4/38-1/52
	AMOX	Apr-38
Mexicana de Cobre, S.A. de C.V.	MDCX	added 7/89; 1/94-7/2000
Mexico North Western	NODM	1/75-1/80
Meyer Kornblum Refrigerator Car Co.	MKPX	Apr-38
MG Industries	THCX	Jul-00
MG Rail, Inc.	MGRI	1/94-7/2000
MHC Inc., Wholly Owned Subsidiary of ConAgra, Inc.	CAAX	added 10/92; 1/94-7/2000
	CAGX	1/80-7/2000
	PBLX	added 4/90; 1/94; eliminated 1/2000; 7/2000
	CRMX	1/94; eliminated 1/2000; 7/2000
	LMWX	added 7/92; 1/94-7/2000; eliminated 4/2001
	PVFX	added 1/83; 1/94; eliminated 10/96
	PVGX	added 1/83; 1/94; eliminated 10/96
MHF Logistical Solutions Inc.	MHFX	added 10/98; 7/2000
Michael D. Boxberger	MBBX	added 1/80; 1/80; eliminated 1/81
Michels Pipeline Construction, Inc.	MPCX	added 4/91; 1/94-7/2000
Michigan Alkali Co.	MAX	Apr-38
Michigan Central R.R.	MC	Jan-75
Michigan Chemical Corp.	MCTX	10/57-1/75
Michigan Northern Ry. Co., Inc.	MIGN	eliminated 1/79; 1/80; eliminated 4/89
Michigan Pickle Co.	MPKX	Jan-52
Michigan Products Dairy Co. (Merchants Despatch Transportation Corp.)	MPDX	Apr-38
Michigan Shore R.R., Inc.	MS	added 7/91; 1/94-7/2000
Michigan Southern R.R., Inc.	MSO	added 4/91; 1/94; eliminated 1/98; 7/2000
Michigan Sugar Co.	MSGX	Apr-38
Michigan-Wisconsin Transportation Co.	MWTT	added 4/85; eliminated 10/91; 1/94
Mid Atlantic R.R. Co., Inc.	MRR	added 7/88; 1/94; eliminated 4/96
Mid South Milling Co., Inc.	MSMX	added 4/81; eliminated 10/93; 1/94
Mid-Am Equipment, Inc.	JCLX	added 7/79; 1/80; eliminated 10/84; added 10/93; 1/94; eliminated 7/95; 7/2000
Mid-Am Equipment, Inc.	NECX	added 7/81; 1/94-7/2000
Mid-America Locomotive & Car Repair, Inc.	MALX	Jul-00
Mid-American Car & Equipment Co.	MATX	added 7/65; 7/65-1/75; eliminated 4/75
MidAmerican Energy Co.	MARX	added 10/98; 7/2000
	MAXX	added 4/96; 7/2000
	MRDX	added 4/99; 7/2000
	IOPX	added 4/96; 7/2000
	IPSX	added 4/96; eliminated 4/99
	LGSX	added 4/96; 7/2000
	LRDX	added 4/96; 7/2000
	TRIX	added 4/96; eliminated 4/99
	UNSX	added 4/96; 7/2000
	WRDX	added 4/96; 7/2000
Mid-Continent Petroleum Corp.	COSX	4/38-1/52
	OSKX	Jan-52
Middle Fork	MF	1/75-1/80
Middleboro Chemical Industries, Inc.	MDCX	4/70; eliminated 1/72
Middletown & Hummelstown R.R. Co.	MIDH	1/80-7/2000
Middletown & Unionville R.R.	MU	Apr-38
Middletown and New Jersey Ry. Co., Inc.	MNJ	1/75; added 4/78; 1/80-7/2000
Midland	MLD	1/75-1/80
Midland Continental R.R.	MICO	Oct-66
Midland Cooperative Wholesale, Cushing Refining Division	CRGX	1/52; eliminated 4/54
Midland Cooperatives, Inc.	CRGX	eliminated 1/69
Midland Cooperatives, Inc., Cushing Refining Division	CRGX	added 4/54; 10/57-10/66
Midland Ry. Co. of Manitoba	MLD	4/38-10/66
Midland Terminal Rwy. Co.	MTR	Apr-38
Midland Valley R.R. Co.	MV	4/38-10/66
MidLouisiana Rail Corp.	MDR	added 1/88; 1/94; eliminated 7/94
	NLG	added 1/88; 1/94; eliminated 7/94
Mid-Michigan R.R., Inc.	MMRR	added 4/88; 1/94-7/2000
Mid-South Bulk Services, Inc.	MBSX	added 4/2000; 7/2000
MidSouth Rail Corp.	MSRC	added 7/86; 1/94; eliminated 7/94
Midvale-Heppenstall Co.	MHSX	added 10/65; 10/66-4/70; eliminated 1/71
Midway	MID	Jan-80
Midway R.R. Co.	MID	Jan-75
Midwest Bottle Gas Co.	TRUX	added 1/78; 1/80-7/2000
Midwest By-Products Co.	MWBX	added 7/74; 1/75-1/80; eliminated 7/87
Midwest By-Products Co., a Division of Gilco, Inc.	MWBX	added 7/87; 1/94; eliminated 10/95
Midwest Coal Handling, Inc.	MWCL	1/94-7/2000
Mid-West Despatch Car Co.	MWDX	Apr-38
	REPX	Apr-38
Midwest Energy Service Co.	IPSX	added 5/83
Midwest Energy Services Co.	MIDX	added 4/89; 1/94
Midwest Generation LLC	CWEX	added 10/2000
Midwest Grain Products, Inc.	MWSX	added 1/86; 1/94; eliminated 10/94
Midwest Locomotive Leasing & Sales, Inc.	MWLX	Jul-00
Mid-West Mineral Products, Inc.	MWMX	added 7/69; 4/70; eliminated 10/71
Mid-West Mud Co., Inc.	MWMX	added 1/78; 1/80; eliminated 4/85
Midwest Power Systems	IOPX	added 4/93; 1/94; eliminated 4/96
	IPSX	added 1/94; eliminated 4/96
	TRIX	added 1/94; eliminated 4/96
	UNSX	added 4/93; 1/94; eliminated 4/96
MidWest Rail Holdings, Inc.	MWRX	Jul-00
Midwest Railcar Corp.	MWCX	added 4/2000; 7/2000
Midwest Solvents Co., Inc.	MWSX	1/80; eliminated 1/86
Midwest Transportation & Development Corp.	MTDX	added 4/2001
Midwestern Farm Fertilizers, Inc.	MFFX	4/61-7/65; eliminated 10/65
Milchem Inc.	MILX	added 4/82; eliminated 7/88
Mile-High Railcar Leasing, Inc.	MHRX	added 1/80; 1/80; eliminated 1/88
	MRSX	added 10/83; eliminated 1/88
	MHRX	added 1/88; eliminated 1/93; eliminated 4/93; 1/94-7/2000
Mile-High Railcar Services, Inc.	MRSX	added 1/88; eliminated 4/93; 1/94-7/2000
Miles Inc.	MLEX	Jul-00
Milk Products Refrigerater Line (Merchants Despatch Transportation Corp.)	MLKX	Apr-38
Millennium Inorganic Chemicals, Inc.	MQPX	added 7/2000; 7/2000
Millennium Petrochemicals, Inc.	MIPX	7/2000; eliminated 4/2001
Miller & Hart, Inc. (General American Transportation Corp.)	MAHX	Apr-38
Miller Compressing Co.	GCOX	7/65-4/70; eliminated 1/73
Milpark Drilling Fluids	MILX	added 7/88; eliminated 7/93
Milstead	MLST	1/75-1/80
Milwaukee Solvay Coke Co.	MSKX	1/52-4/61
Milwaukee Solvay Coke Co., a Division of Pickands Mather & Co.	MSKX	added 7/66; 10/66-4/70; eliminated 10/70
Milwaukee Solvay Coke Co., Inc.	MSKX	eliminated 7/65
Milwaukee Solvay Coke Division, Manganese Chemicals Corp.	MSKX	added 7/65; eliminated 7/66
Milwaukee Solvents & Chemicals Corp.	MISX	added 1/74; 1/75-7/2000
Milwaukee Vinegar Co.	MVX	4/38-1/52; eliminated 4/57
Min-Ad, Inc.	HSWX	4/70; added 7/70; eliminated 10/70
Mindis Recycling	MIRX	added 1/97
Miner Enterprises	WHMX	1/94; added 1/97; eliminated 4/97; 7/2000
Minera Mexico Internacional, Inc.	MIMX	added 7/78; 1/80; eliminated 7/87; 1/94-7/2000
Mineral Point Zinc Co.	MPZX	Apr-38
Mineral Point Zinc Division, The New Jersey Zinc Co.	MPZX	1/52-10/57; eliminated 10/58
Mineral Range R.R. Co.	MLR	4/38-1/52
Mineral Range, Inc.	MRAX	Jul-00
Mineral Wells & Eastern Ry. Co.	MWRY	added 7/90; eliminated 4/93; 1/94
Miner-Hillard Milling Co.	MHMX	7/65-10/66; eliminated 4/67
Minneapolis & St. Louis Ry. Co. (Chicago and North Western Ry. Co.)	MSTL	7/65-10/66
Minneapolis Eastern Ry. Co.	MINE	1/75-1/80
Minneapolis Industrial Ry. Co.	MIR	4/61-10/66 & 1/75-1/80; eliminated 1/85
Minneapolis, Anoka and Cuyuna Range R.R. Co.	MA&C	Apr-38
	MACR	Jan-75
Minneapolis, Northfield and Southern Ry.	MNS	1/52-10/66 & 1/75-1/80; eliminated 4/80
Minneapolis, Northfield and Southern Ry., Inc.	MNS	added 4/80; eliminated 4/86
Minneapolis, Red Lake and Manitoba Ry. Co.	MRLM	Apr-38
Minneapolis, St. Paul & Sault Ste. Marie Ry. Co.	SOO	4/38-4/61
Minnesota & International Ry. Co.	MI	Apr-38
Minnesota Central R.R. Co.	MCTA	added 4/95; eliminated 4/97; 7/2000
Minnesota Commercial Ry. Co.	MNNR	added 4/87; 1/94-7/2000
Minnesota Corn Processors Bulk Products Division	DMIX	added 10/95; 7/2000
	LSIX	added 7/2000; 7/2000
	SYRX	added 4/96; 7/2000
Minnesota Corn Processors, Inc.	MNCX	added 4/85; 1/94-7/2000; eliminated 10/2000
	DMIX	added 4/95; eliminated 7/95
Minnesota Corn Processors, Inc. Fructose Division	SYRX	added 4/94; eliminated 4/96
Minnesota Dept. of Public Service Weights and Measures Division	MNWX	added 7/93; 1/94; eliminated 10/99; 7/2000
Minnesota Mining & Manufacturing d/b/a 3M	MMMX	Jul-00
Minnesota Mining and Manufacturing Co., Inc.	MINX	1/52-10/66; eliminated 4/68
Minnesota Northern R.R., Inc.	MNN	7/2000; added 4/2001
Minnesota Short Lines Co.	MSLC	Jan-80
Minnesota Steel Co. (American Steel & Wire Co.)	MSSX	Apr-38
Minnesota Valley Transportation Co., Inc.-Southwest	MNVA	added 7/84; eliminated 10/90
Minnesota Western Ry. Co.	MW	4/38-10/57
Minnesota, Dakota & Western Ry. Co.	MDW	1/75-7/2000
Miron/U.S.A. Ltd.	REDX	added 1/86; eliminated 7/91; 1/94-7/2000
Mis Coa, a partnership of Mississippi Chemical Corp. and Coastal Chemical Corp.	MICX	eliminated 10/72
Mississipian Ry. Cooperative, Inc.	MSRW	added 1/87; 1/94-7/2000
Mississippi & Skuna Valley R.R. Co.	MSV	added 7/74; 1/75-7/2000
Mississippi Central R.R.	MSC	4/38-10/66
Mississippi Central R.R. Co.	MIS	1/94-7/2000
	MSCI	added 4/98; 7/2000
	NTR	added 4/94; 7/2000
Mississippi Chemical Corp.	MICX	1/52-4/70
Mississippi Chemical Corp.	MICX	added 10/72; 1/75-1/80; eliminated 10/81
Mississippi Delta R.R.	MSDR	added 4/86; 1/94-7/2000
Mississippi Eastern Ry.	ME	4/38-1/52
Mississippi Export R.R. Co.	MSE	4/38-7/2000
Mississippi Power Co.	DEGX	added 7/78; 1/80-7/2000
Mississippian	MISS	1/75-1/80
Mississipppi & Tennessee RailNet, Inc.	MT	Jul-00
Missouri & Northern Arkansas R.R. Co., Inc.	MNA	added 4/93; 1/94-7/2000
Missouri & Northern Arkansas Ry. Co.	M&NA	Apr-38
Missouri and Arkansas Ry.	MA	Jan-52
Missouri and Arkansas Ry. Co.	MAR	Apr-38
Missouri Central R.R. Co.	MOC	Jul-00
Missouri Improvement Co.	MLHX	added 10/71; 1/75-1/80
Missouri Pacific R.R. Co.	MI	Jan-80
	MP	4/38-10/66 & 1/75-1/80
	ARDP	Jan-75
	ARMH	added 1/75; 1/75; eliminated 7/75
	ARMN	added 11/73; 1/75-1/80
	CEI	Jan-80
	TNM	Jan-80
	TP	Jan-80
	TPL	added 1/77; 1/80
Missouri Pacific Railroad Co.	MOD	added 1/77; 1/80
	ABM	added 1/77
	KOG	added 1/77; 1/80
	LOA	added 1/77; 1/80
	LOC	added 1/77; 1/80
Missouri Pacific System	MI	1/94; eliminated 4/97
	MKT	added 1/90; 1/94; eliminated 4/97
	MKTT	added 1/90; 1/94; eliminated 4/97
	MOD	eliminated 10/81; eliminated 5/83
	MP	1/94; eliminated 4/97
	ABM	eliminated 4/79
	ARDP	1/94; eliminated 4/97
	ARMH	1/94; eliminated 4/97
	ARMN	1/94; eliminated 4/97
	A&S	eliminated 1/79
	BKTY	added 1/90; 1/94; eliminated 4/97
	CEI	added 1/77
	CEI	1/94; eliminated 4/97
	CHTT	added 4/81; 1/94; eliminated 4/97
	DKS	eliminated 4/97
	KOG	eliminated 1/80
	LOA	eliminated 1/81
	LOC	eliminated 1/81
	NLC	eliminated 1/79
	OKKT	added 1/90; 1/94; eliminated 4/97
	TNM	eliminated 7/84; eliminated 1/90
	TP	added 1/77; 1/94; eliminated 4/97
	TPL	eliminated 1/81
	UT	eliminated 1/79
Missouri Portland Cement Co.	MOCX	1/52-1/80; eliminated 10/84
Missouri Public Service	MPSX	added 4/89
Missouri Public Service Co.	MPSX	added 10/68; 4/70-1/80; eliminated 4/89
	MPSX	1/94-7/2000
Missouri Southern R.R. Co.	MS	4/38-1/52
Missouri Tank Car Corp.	IMTX	Apr-38
Missouri Valley Walnut Co.	IMWX	1/80; eliminated 1/82
	SJWX	1/80; eliminated 1/82
	WPCX	1/80; eliminated 1/82
Missouri-Illinois R.R. Co.	MI	10/57-10/66 & 1/75
Missouri-Kansas-Texas R.R. Co.	M-K-T	Apr-38
	MKT	1/52-10/66 & 1/75-1/80; eliminated 1/90
	MKTT	7/65-10/66 & 1/75-1/80; eliminated 1/90
	BKTY	10/66-1/80; eliminated 1/90
Missouri-Kansas-Texas R.R. Co. of Texas	MKTT	4/38-4/61
Mitsubishi Cement Corp.	KCGX	added 1/90; 1/94; eliminated 1/97
M-K Railroad Equipment Leasing Co., Inc.	MKIX	1/80; eliminated 4/89; 1/94
MLWX Co.	MLWX	1/52-10/57; eliminated 7/60
MNVA R.R., Inc.	MNVA	added 10/90; 1/94; eliminated 4/95
Mobay Chemical Co.	BAYX	added 7/74; 1/75; eliminated 1/78
Mobay Chemical Corp.	BAYX	added 1/78; 1/80
Mobay Corp.	SJNX	1/94-7/2000
Mobil Oil Co., a Division of Socony Mobil Oil Co., Inc.	MOBX	eliminated 10/66
	ANPX	added 4/61; 4/61
	GPCX	added 1/60
Mobil Oil Co., a Division of Socony Mobil Oil Co., Ltd.	MPCX	added 1/60
Mobil Oil Corp.	MBLX	added 1/95; eliminated 7/2000
	MOBX	added 10/66; 10/66-1/94; eliminated 7/2000
	STDX	added 1/69; 4/70; eliminated 7/70
Mobile & Gulf R.R. Co.	MG	1/75-1/80
Modern Continental Construction Co. Inc.	MCTX	Jul-00
Modern Dispersions, Inc.	MDIX	Jul-00
Modern Sanitary Rendering Co., Inc.	MSRX	1/52; eliminated 4/54
Modern Track Machinery Canada Ltd.	MTMX	Jan-80
Modern Track Machinery Canada Ltd. (MofW cars)	MTMX	Jan-94
Modesto & Empire Traction Co.	METC	4/38-10/66; eliminated 7/74
Modesto and Empire Traction Co.	MET	1/75-7/2000
Mohall R.R., Inc.	MRI	Jul-00
Mohawk, Adirondack & Northern R.R. Corp.	MHWA	1/94; added 1/96; 7/2000
Monad Railway Equipment Co.	MREX	Jul-00
Monarch Cement Co.	MQCX	added 4/80; eliminated 4/87; 1/94
Monarch Foods, Canners & Processors	CGCX	added 1/58
Monarch Molasses Co.	MMX	1/52; eliminated 1/53
Monarch Refineries, Inc.	MRIX	Jan-52
Monon R.R.	MON	10/57-10/66
Monongahela Connecting R.R. Co.	MGAC	7/65-10/66
Monongahela Ry. Co.	MGA	4/38-10/66 & 1/75-1/80; eliminated 7/93
Monongahela West Penn Public Service Co.	MWP	Apr-38
Monsanto Chemical Co.	MCPX	added 4/62; eliminated 7/64
	MLUX	added 7/59; 4/61; eliminated 7/64
	MOHX	added 1/60; 4/61; eliminated 7/64
	MONX	10/57-4/61; eliminated 7/64
Monsanto Chemical Co., Everett Plant	MCHX	added 4/54; eliminated 7/55
Monsanto Chemical Co., Merrimac Division	MCHX	1/52; eliminated 4/54
Monsanto Co.	MCPX	added 7/64; 7/65-1/94; eliminated 1/98
	MLSX	added 10/97; added 1/98; 7/2000
	MLUX	added 7/64; 7/65-1/94; eliminated 1/98
	MOHX	added 7/64; 7/65-1/94; eliminated 1/98
	MONX	4/38-1/52
	MONX	added 7/64; 7/65-1/94; eliminated 1/98
Montana Phosphate Products Co.	MPPX	added 7/55
Montana Power Co.	MPRX	1/52-10/57; eliminated 10/60
	MTPX	added 10/94; 7/2000
Montana RailLink, Inc.	MRL	added 4/88; 1/94-7/2000
Montana Western Ry. Co., Inc.	MWRR	added 1/87; 1/94-7/2000
Montana, Wyoming & Southern R.R. Co.	MWS	4/38-1/52
Montell Canada Inc.	HCLX	added 4/96; 7/2000; eliminated 1/2001
Montell U.S.A., Inc.	MLLX	added 4/96; 7/2000; eliminated 1/2001
	HPIX	added 4/96; 7/2000; eliminated 1/2001
Montour R.R. Co.	M	4/38-10/66
	MTR	4/61-10/66 & 1/75-1/80; eliminated 10/86
Montpelier & Barre R.R.	MB	1/75-1/80; eliminated 1/81
Montpelier and Wells River R.R.	M&WR	Apr-38
Montreal Tramways	MOTC	1/75-7/2000
Montrose Beef Co.	MBX	1/52-10/57; eliminated 4/61
Mooney Chemicals, Inc.	MCIX	added 1/59; 4/61-7/65
Morgan Engineering Co.	MOEX	added 7/63; 7/65-1/75
Morgan Engineering, a Unit of the Equipment Systems Division, AMCA International Corp.	MOEX	1/80; eliminated 10/81
Morgan Engineering, Koehring Production System Division AMCA International Corp.	MOEX	added 10/81; eliminated 10/84
Morgan's Louisiana & Texas R.R.	ML&T	4/38-1/52
Morlunda Farms	MFNX	Apr-70
Morlunda Farms, Oscar Nelson, Inc.	MFNX	added 4/65; added 1/67
Morrell Refrigerator Car Co. (Dissolved)	MRUX	Apr-38
	MRX	Apr-38
Morrell Refrigerator Line (T.H. Foster, Trustee)	MRX	Jan-52
Morrell Tank Line (Morrell Refrigerator Car Co.)	MTX	Apr-38
Morrell Tank Line (T.H. Foster, Trustee)	MTX	Jan-52
Morrison Car Leasing, Inc.	MCLX	added 4/67; 4/70-1/80
Morrison Grain Co.	MGCX	added 1/67; eliminated 4/67
Morrison Grain Co., Inc.	MLMX	added 7/74; 1/75-1/80; eliminated 4/87
Morrison Knudsen Corp.	MKCX	Jul-00
	MKIX	Jul-00
Morrison Plan, Inc.	IRCX	added 1/62; 7/65; eliminated 4/66
Morrison Railway Supply Corp.	MRCX	added 4/69; 4/70-1/80; eliminated 4/80
Morrison-Knudsen Co., Inc.	MKIX	added 10/71; 1/75
Morrison-Quirk Grain Corp.	MQGX	added 7/73; 1/75-1/80
Morristown & Erie R.R.	MT&E	4/38-10/57
Morristown & Erie R.R. Co.	ME	1/75-1/80; added 1/86; eliminated 1/88
Morristown & Erie Ry., Inc.	ME	added 1/88; 1/94-7/2000
Morse Bros., Inc.	MBIX	Jul-00
Morton Chemical Co.	MCWX	4/61; eliminated 4/62
	BAYX	eliminated 1/59
Morton International, Inc.	MCWX	added 7/65; 7/65-10/66; eliminated 7/69
	MNPX	added 4/97; 7/2000
	MSIX	added 10/96; 7/2000
	CBCX	added 10/96; eliminated 1/2000; 7/2000; added 10/2000; eliminated 4/2001
Morton Salt Co.	MCWX	added 4/62; eliminated 7/65
	MNPX	added 7/80; eliminated 7/81
	MSX	10/57-4/61
Morton Salt-Division Norwich Products, Inc.	MNPX	added 7/81; eliminated 10/81
Morton Salt-Division of Morton Norwich Products, Inc.	MNPX	added 10/81; eliminated 4/87
Morton Salt-Division of Morton Thiokol, Inc.	MNPX	added 4/87; 1/94; eliminated 4/97
Moscow, Camden & San Augustine R.R.	MC&S	Apr-38
Moscow, Camden & San Augustine R.R.	MCSA	1/75; added 7/79; 1/80; 1/94; eliminated 1/2000; 7/2000
Moshassuck Valley R.R. Co.	MOV	1/75-1/80; eliminated 1/83
Mosinee Paper Corp.	MOSX	1/94-7/2000
Mosinee Paper Mills Co.	MMX	Apr-38
Motive Power, Inc.	MPIX	Jul-00
Motivepower Industries Inc.	MPEX	Jul-00
Mount Hood R.R.	MH	added 1/89; eliminated 10/89
Mount Hood R.R. Co.	MH	Jul-00
Mount Hood Ry. Co.	MH	1/75-1/80; eliminated 1/89
Mount Hope Mineral R.R.Co.	MHM	Jan-75
Mount Washington Ry. Co.	MWRC	1/75-7/2000
Mountain Laurel R.R. Co.	MNL	Jan-94
Mountain States Energy Corp.	MSEX	added 7/86; eliminated 10/87
Moxahala Valley Ry. Co.	MOXV	added 10/83; eliminated 10/87
Moyer Packing Co.	MPCX	added 10/81; eliminated 1/87
M-P Petroleum Ltd.	HRDX	eliminated 10/78
MRC Rail Services L.L.C.	MBKX	added 4/98; added 10/99; 7/2000
	MIDX	added 4/98; 7/2000
	UNTX	added 4/98; 7/2000
Mt. Vernon Car Manufacturing Co.	DAIX	1/52-4/61
Mt. Vernon Coal Transfer Co.	MCCX	added 1/83; 1/94-7/2000; eliminated 10/2000
Mt. Vernon Terminal	MVT	1/75-7/2000
Mt. Vernon Transfer Terminal, LLC	MCCX	added 10/2000
MTAX Corp.	MTAX	added 7/88; 1/94; eliminated 4/96; 7/2000
Multifoods Transportation, Inc.	IMTX	added 7/80; eliminated 4/92
Muncie and Western R.R. Co.	MWR	4/38-1/94; eliminated 1/95
Municipal Docks	MD	Jan-80
Municipal Docks Ry. of the Jacksonville Port Authority	MD	Jan-75
Municipality of East Troy, Wisc.	METW	1/75-7/2000
Murro Chemical Co., Inc.	MUCX	7/65-1/75; eliminated 7/76; eliminated 10/78
Muscaline Power & Water	MPWX	added 4/94; 7/2000
Museum of Transportation	MOTX	Jul-00
Mutual Chemical Co. of America	MCCX	4/38-1/52; eliminated 7/55
Mutual Chemical Division, Allied Chemical & Dye Corp.	MCCX	eliminated 7/58
Mutual Chemical Division, Allied Chemical and Dye Corp.	MCCX	added 7/55; 10/57
Myer's Propane Gas Service, Inc.	MPIX	added 7/74; 1/75-1/80; eliminated 7/86
Mystic Terminal Co.	MTC	1/52-4/61
	MTC	1/75-1/80
Mystic Terminal Co. (Boston and Maine Corp.)	MTC	Apr-38
	MTC	7/65-10/66