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.

C

• CA - Chesapeake and Albemarle Railroad
• CABU - Bacardi and Company, Ltd.
• CABX - Cabot Corporation
• CACV - Cooperstown and Charlotte Valley Railroad
• CACZ - Comacasa Line
• CAD - Cadiz Railroad
• CADX - Cando Corporation
• CAEG - Coffeen and Western Railroad (subsidiary of Ameren)
• CAFU - Bay Cities Leasing Company
• CAGX - MHC, Inc. (subsidiary of ConAgra)
• CAGY - Columbus and Greenville Railway
• CAGZ - Columbus and Greenville Railway
• CAIX - Cominco American, Inc.; CAI Rail, Inc.
• CALA - Carolina Southern Railroad
• CALX - California Railcar Corporation
• CAMX - Canamax Commodity Corporation
• CAMY - Camp Chase Railway
• CANX - CANAC International, Inc.
• CAOX - Westlake CA and O
• CAPX - TransAlta Utilities Corporation
• CARR - Carrollton Railroad
• CARX - Carlon; Lamson and Sessions
• CARZ - Anton Caraton and Son
• CASO - Canada Southern Railway; New York Central Railroad; Penn Central; Canadian Pacific Railway
• CATU - CATU Containers, SA
• CAXU - Container Applications International, Inc.
• CBC - Carbon County Railway; Chemin de fer Baie des Chaleurs
• CBCX - Colonial Brick Company, Inc.
• CBFX - CIT Group/Capital Finance, Inc.
• CBGR - Council Bluffs Railway; Great Western Railway of Iowa
• CBHU - China Ocean Shipping Company
• CBIU - Combi Line-Lash
• CBIX - Central Bi-Products
• CBL - Conemaugh and Black Lick Railroad
• CBLU - Cooper Brothers Containers, Ltd.
• CBNS - Cape Breton and Central Nova Scotia Railway
• CBPU - CBSL Transportation Services, Ltd.
• CBQ - Chicago, Burlington and Quincy Railroad; Burlington Northern Railway; Burlington Northern and Santa Fe Railway; BNSF Railway
• CBQZ - Chicago, Burlington and Quincy Railroad; Burlington Northern Railway; Burlington Northern and Santa Fe Railway; BNSF Railway
• CBRM - Chillicothe-Brunswick Rail Maintenance Authority
• CBRW - Columbia Basin Railroad
• CBRX - Charles Barthoid
• CBRY - Copper Basin Railway
• CBTX - Central Bi-Products
• CBYN - Crosbyton Railway
• CC - Chicago Central and Pacific Railroad
• CCAX - FDJ Leasing
• CCBX - Union Carbide Corporation
• CCC - Clinchfield Coal Corporation
• CCCL - Connecticut Central Railroad
• CCCU - Compass Container Company, Inc.
• CCCX - Carondelet Coke Corporation
• CCCZ - Compass Container Company, Inc.
• CCDX - Dayton Power and Light Company
• CCET - Cincinnati East Terminal Railway
• CCEZ - Chicago Central and Pacific Railroad
• CCFG - Chemin de fer Gaspésie
• CCFZ - Chi-Can Freight Forwarding
• CCGX - Cando Contracting, Ltd.^[1]
• CCHX - Columbian Chemicals Canada, Ltd.
• CCIM - Corpus Christi Terminal Railroad
• CCIX - Stauffer Chemical Company (Consolidated Chemical Division)
• CCIZ - Crete Intermodal
• CCKX - California Contemporary, Inc.; CCKX, Inc.
• CCKY - Chattooga and Chickamauga Railway
• CCLU - Char Ching Shipping (USA), Ltd.
• CCLX - Crystal Car Lines
• CCMX - Calcium Carbonate Company
• CCPR - Chelatchie Prairie Railroad
• CCPX - Canadian Chemical Producers
• CCQX - Construction Carrier, Inc.
• CCR - Corinth and Counce Railroad; Kansas City Southern Railway
• CCRR - Claremont Concord Railroad
• CCRU - Compagnie Des Containers Reservoir
• CCRX - Coastal Refining and Marketing, Inc.
• CCRY - Charles City Railway
• CCRZ - Kansas City Southern Railway
• CCSU - Trans Ocean, Ltd.
• CCT - Central California Traction Company
• CCTU - Coordinated Caribbean Transport, Inc.
• CCTX - Central Power and Light Company
• CCTZ - Crowley Maritime Corporation
• CCUO - Chicago-Chemung Railroad
• CCWX - Coastal Chem, Inc.
• CCX - Columbian Chemicals Company
• CCXU - Char Ching Shipping (USA), Ltd.
• CCXX - Costain Coal, Inc.
• CDAC - Canadian American Railroad; Bangor and Aroostook Railroad; Montreal, Maine and Atlantic
• CDAU - Canadian Tire Corporation Ltd.
• CDAZ - Canadian Tire Corporation Ltd.
• CDCX - Air Liquide America Corporation
• CDEX - Coastal Distribution, LLC
• CDGX - Carolinas Domestic Gas Company, Inc.; Chatham Oil Company
• CDHX - Caledonian Rail Lines, LLC
• CDLZ - Cardinal Freight Carriers
• CDNU - Carotrans International
• CDPX - Chevron USA, Inc.
• CDTX - California Department of Transportation (Amtrak California)
• CDVX - Caddo Valley Railcar Repair, Inc.
• CEBX - Combustion Engineering, Inc.
• CEDR - Cedar River Railroad
• CEFX - CIT Group/Capital Finance, Inc.
• CEI - Chicago and Eastern Illinois Railroad; Missouri Pacific Railroad; Union Pacific Railroad
• CEIW - Central Indiana and Western Railroad
• CELX - Celtran, Inc.
• CEMR - Central Manitoba Railway
• CEMX - Cementos Mexicanos, SA; Cemex Mexico, SA de CV
• CENX - Western Aggregates, Inc.
• CEPX - Cajun Electric Power Cooperative, Inc.; Trinity Industries Leasing
• CERA - Central Railroad Company of Indianapolis
• CERX - Carpenter Chemical Company; ER Carpenter, LLP
• CETU - Custom Environmental Transport, Inc.
• CEWX - Canadian Enterprise Gas Products
• CF - Cape Fear Railway
• CFC - Chemin de fer Charlevoix
• CFE - Chicago, Fort Wayne and Eastern
• CFKZ - XTRA Intermodal
• CFL - Chemin de fer Lanaudière
• CFLX - Crestbrook Forest Industries
• CFM - Chemin de fer de Matapédia et du Golfe
• CFMG - Chemin de Fer de Matapédia et Gaspésie
• CFMX - Cargill, Inc.
• CFNR - California Northern Railroad
• CFO - Ottawa Central Railway
• CFPX - GE Railcar Services Corporation
• CFQC - Quebec Central Railway
• CFRR - Chemin de fer Rivière Romaine
• CFRU - Cardinal Freight Carriers
• CFS - Sartigan Railway
• CFSX - C and T Refinery, Inc.
• CFTX - Canadian Fertilizers, Ltd.
• CFWR - Caney Fork and Western Railway
• CG - Central of Georgia Railway; Norfolk Southern Railway
• CGA - Central of Georgia Railway; Norfolk Southern Railway
• CGAX - Cargill, Inc. (C.G.D. Division)
• CGBX - Procor, Ltd.; Dow Chemical Canada, Inc.
• CGCX - Continental Grain Company
• CGDX - Country Gas Distributors, Inc.; Eastern Propane Gas
• CGEX - Canadian General Electric Company, Ltd.; Cargill, Inc.
• CGFX - Consolidated Gas Company of Florida
• CGLX - Canadian General Transit; General American Train Company
• CGMU - Compagnie Generale Maritime
• CGMX - GATX Rail Canada Corporation
• CGMZ - Compagnie Generale Maritime
• CGNE - Champagne Railroad, Inc.
• CGOX - Cargill, Inc.
• CGR - CG Railway
• CGRX - Consolidated Grain and Barge Company
• CGRY - Carrizo Gorge Railway, Inc.
• CGSX - Proflame Incorporated
• CGT - Canada and Gulf Terminal Railway
• CGTU - Compagnie Generale Maritime
• CGTX - Canadian General Transit; General American Train Company
• CGW - Chicago Great Western Railway; Chicago and North Western Railway; Union Pacific Railroad
• CHAT - Chattahoochee and Gulf Railroad
• CHAU - Combined Transport Group, Inc.
• CHAX - Chartrand's Tank Car Service, Inc.
• CHEX - Chemplex Company; Equistar Chemicals
• CHFU - Challenge International
• CHH - Cheswick and Harmar
• CHIU - Chimco - Bulgaria
• CHLX - Chemleco, Inc.
• CHMX - C. H. Masland and Sons; First Union Rail
• CHOX - Sugar Express
• CHP - Ferrocarril de Chihuahua al Pacifico, SA de CV; Ferrocarriles Nacionales de Mexico
• CHR - Chestnut Ridge Railway
• CHRC - Chaparral Railroad
• CHRR - Chesapeake Railroad
• CHRX - Chesapeake Railway Association; previously the Chesapeake Division, Railroad Enthusiasts, Inc. until 1 Dec 1999.
• CHS - Charlotte Southern Railroad
• CHSX - Cenex Harvest States Cooperative
• CHSZ - Intermodal Services, Inc.
• CHTS - Penn Eastern Rail Lines, Inc.
• CHTT - Chicago Heights Terminal Transfer Railroad; Missouri Pacific Railroad; Union Pacific Railroad
• CHV - Chattahoochee Valley Railway
• CHVX - Chevron Chemical Company
• CHW - Chesapeake Western Railway; Norfolk Southern
• CI - Cambria and Indiana Railroad
• CIBX - CIT Group/Capital Finance, Inc.
• CIC - Cedar Rapids and Iowa City Railway (Crandic)
• CIGX - CIT Group/Capital Finance, Inc.
• CIIX - Contico International, Inc.
• CIM - Chicago and Illinois Midland Railway
• CIND - Central Railroad Company of Indiana
• CIPX - Central Illinois Public Service Company; Ameren Energy Generating Company
• CIR - City of Rochelle, Illinois
• CIRR - Chattahoochee Industrial Railroad
• CIRX - Consbec, Inc.
• CIRY - Central Illinois Railroad
• CISD - Colonel's Island Railroad
• CITU - Cincinnati Union Terminal
• CITX - CIT Group/Capital Finance, Inc.
• CIW - Illinois Central Gulf; Illinois Central Railroad; Canadian National Railway
• CIWN - Cincinnati, Indianapolis and Western Railroad
• CIXX - Calciner Industries, Inc.
• CJPX - General Electric Rail Services Corporation
• CKIN - Chesapeake and Indiana Railroad
• CKIX - C.K. Industries
• CKP - Colorado Kansas and Pacific Railway
• CKRY - Kansas and Oklahoma Railroad
• CKSI - Carthage Knightstown and Shirley Railroad
• CL&N - Cincinnati, Lebanon and Northern Railway
• CLC - Columbia and Cowlitz Railway
• CLCO - Claremont and Concord Railway
• CLCX - Union Oil Company of California; Chattahoochee Locomotive Company
• CLCZ - Complete Logistics Company
• CLDZ - Celadon Trucking Services, Inc.
• CLEX - Chemical Enterprises, Inc.; Cieco Corporation
• CLGR - Central Louisiana and Gulf Railroad
• CLGU - Costa Line Cargo Services
• CLIF - Cliffside Railroad
• CLIX - Calumet Lubricants
• CLK - Cadillac and Lake City Railway
• CLMX - Consolidated Thompson Iron Mines Limited
• CLNA - Carolina Coastal Railway
• CLOU - CLOU Container Leasing, GmbH
• CLOX - Clark Refining and Marketing, Inc.
• CLP - Clarendon and Pittsford Railroad
• CLPX - Boulder Scientific Company
• CLPZ - Clarendon and Pittsford Railroad
• CLRX - Clayton Rail
• CLSL - Columbia and Silver Creek Railroad
• CLSX - Cargill (Salt Division)
• CLTU - Chemical Leaman Tank Lines, Inc.
• CLTX - Cloro de Tehuantepec, SA de CV
• CM - Central Montana Rail
• CMBU - CMB, SA
• CMC - CMC Railroad, Inc.
• CMCU - Crowley Maritime Corporation
• CMCX - Sweetman Construction Company
• CMCZ - Crowley Maritime Corporation
• CMDX - Cargill, Inc.
• CMER - Curtis, Milburn and Eastern Railroad
• CMEX - CEMEX, Inc.
• CMG - Chicago, Milwaukee and Gary Railway
• CMGN - Central Michigan Railway
• CMHX - CarMath, Inc.
• CMIX - Consolidated Minerals, Inc.
• CMLU - Containers Marine Lines (Division of American Export Lines)
• CMLX - Craggy Mountain Line, Inc.
• CMLZ - Containers Marine Lines Isbrandtsen
• CMMU - Medcontainers
• CMO - Chicago, St. Paul, Minneapolis and Omaha Railway; Chicago and North Western Railway; Union Pacific Railroad
• CMPA - Madison Railroad Division of City of Madison Port Authority
• CMPU - Complete Logistics Company
• CMQ - Central Maine and Quebec Railway
• CMR - Central Midland Railway Company
• CMRX - The Chemours Company, LLC
• CMSX - Cape May Seashore Lines
• CMSN - Crowley Marine Services
• CMU - Columbus Charter Service
• CMUU - Canada Maritime Agencies Limited
• CMWX - Chateau Martin Wine
• CN - Canadian National Railway
• CNA - Canadian National Railway
• CNAZ - Grand Trunk Western Railroad; Canadian National Railway
• CNCX - Columbia Nitrogen Corporation
• CNDX - Connecticut Department of Transportation
• CNE - Central New England Railway; New York, New Haven and Hartford Railroad
• CNEU - Canadian National Railway
• CNEZ - Canadian National Railway
• CNGU - Sicng (Ind. Chim. Du Nord de la Grece SA)
• CNGX - CONAG Finance, Inc.
• CNHX - Ontario Hydro; Ontario Power Generation
• CNIS - Canadian National Railway
• CNJ - Central Railroad of New Jersey; Norfolk Southern
• CNL - Columbia, Newberry and Laurens Railroad; Atlantic Coast Line Railroad; CSX Transportation
• CNLX - CANAC International
• CNMZ - Norfolk Southern
• CNNU - Compania Nacional de Nabegacao
• CNOR - Cincinnati Northern Railroad
• CNOW - Columbia and Northern Railway
• CNOX - Shell Canada, Ltd.
• CNoR - Canadian Northern Railway
• CNPU - Canadian National Railway
• CNPZ - Canadian National Railway
• CNQ - Canadian National Railway End Of Train Devices
• CNRR - California Northern Railroad
• CNRU - Canadian National Railway
• CNRX - Canadian National Railway
• CNRZ - Canadian National Railway
• CNSX - Consolidated Oil and Transportation Company, Inc.
• CNTP - Cincinnati, New Orleans and Texas Pacific Railway
• CNTX - Continental Tank Car Corporation
• CNUR - C&NC Railroad
• CNVX - Convoyeur National, Inc.
• CNW - Chicago and North Western Railway; Union Pacific Railroad
• CNWS - Chicago and North Western Railway
• CNWX - Canadian Wheat Board
• CNWZ - Chicago and North Western Railway; Union Pacific Railroad
• CNYK - Central New York Railroad
• CNYX - Central New York Locomotive Company
• CNZR - Central New England Railroad
• CO - Chesapeake and Ohio Railway; Chessie System; CSX Transportation
• COAX - Trinity Rail Management, Inc.
• COBX - Cobre Mining Company, Ltd.
• COCX - Chevron Oronite Company LLC
• COE - Colorado and Eastern Railroad
• COEH - Conecuh Valley Railroad
• COER - Crab Orchard and Egyptian Railroad
• COEZ - Crab Orchard and Egyptian Railroad
• COLX - Alliant Energy
• COMX - Commonwealth Edison Company
• CONU - Contrans
• CONX - Conoco Inc.
• COOK - Cook Transit
• COOX - Cooperative Producers, Inc.; First Union Rail
• COP - City of Prineville Railway
• COPX - CanadianOxy Industrial Chemicals, LP
• CORP - Central Oregon and Pacific Railroad
• CORU - CATU Containers, SA
• CORX - Coors Brewing Company
• COSU - China Ocean Steamship, Ltd.
• COSX - Cabot Corporation (CAB-O-SIL Division)
• COTX - Consolidated Transportation Corporation; GLNX Corporation
• COZ - CSX Transportation
• CP - Canadian Pacific Railway
• CPAA - Canadian Pacific Railway
• CPAX - CITGO Petroleum Corporation
• CPBU - Soo Line; Canadian Pacific Railway
• CPBZ - Soo Line; Canadian Pacific Railway
• CPCX - Chevron Phillips Chemical Company
• CPDR - South Carolina Central Railroad (Carolina Piedmont Division); Carolina Piedmont Railway
• CPDU - Delaware and Hudson Railway
• CPDX - Chevron USA, Inc.
• CPDZ - Delaware and Hudson Railway
• CPGZ - ContainerPort Group, Inc.
• CPHX - Ontario Hydro; Ontario Power Generation
• CPI - Canadian Pacific Railway
• CPIX - Continental Polymers, Inc.; ICI Acrylics, Inc.
• CPLJ - Camp Lejeune Railroad
• CPLT - Camino, Placerville and Lake Tahoe Railroad
• CPLX - CPLX Leasing
• CPMY - Coopersville and Marne Railway
• CPOX - Consumers Power Company
• CPPU - Canadian Pacific Railway
• CPPX - Consolidated Papers, Inc.
• CPPZ - Canadian Pacific Railway
• CPRS - Canadian Pacific Railway
• CPRX - Carolina Power and Light Company
• CPRZ - Canadian Pacific Railway
• CPSX - Commercial Plastics Systems, Inc.
• CPSU - CP Ships
• CPT - Canadian Pacific Railway End Of Train Devices
• CPVU - Containers and Pressure Vessels, Ltd.
• CPWX - Canadian Wheat Board
• CQPA - Central Columbiana and Pennsylvania Railway
• CR - Norfolk Southern
• CRAX - Crystal Hopper Associates
• CRAZ - Cornucopia Transportation, Inc.
• CRCR - Crete Carrier Corporation
• CRCX - Conrail Shared Assets Operations - Legal Name: Conrail
• CRCZ - Norfolk Southern
• CRDX - Chicago Freight Car Leasing Company
• CREU - Canadian Retail Shippers Association
• CREX - Merchants Investment Company; Citicorp Railmark, Inc.
• CREZ - Canadian Retail Shippers Association
• CRGX - Cargill, Inc.
• CRIJ - Carolina Rail Services, Inc.
• CRIX - GE Railcar Services Corporation; Citicorp Railmark, Inc.
• CRL - Chicago Rail Link
• CRLE - Coe Rail, Inc.
• CRLU - Carlisle Leasing International
• CRLX - Canadian Railserve, Ltd.
• CRMU - Norfolk Southern
• CRMX - The Cropmate Company
• CRMZ - Norfolk Southern
• CRN - Carolina and Northwestern Railway; Norfolk Southern
• CRNX - Coffeyville Resources Nitrogen Fertilizers, LLC
• CROX - Sylvachem Corporation
• CRP - Central Railroad of Pennsylvania; Norfolk Southern
• CRPU - Norfolk Southern
• CRPX - Centennial Gas Liquids
• CRQU - Norfolk Southern
• CRR - Clinchfield Railroad; Seaboard System Railroad; CSX Transportation
• CRRR - Copper Range Refrigerator
• CRRX - Cañon City and Royal Gorge Railroad, LLC
• CRSX - Cost Rail Service
• CRTZ - Norfolk Southern
• CRXU - Cronos Containers (UK)
• CRYX - Cryo-Trans, Inc.
• CRZ - Norfolk Southern
• CS - Colorado and Southern Railway; Burlington Northern Railway; Burlington Northern and Santa Fe Railway; BNSF Railway
• CSAU - Costa Line
• CSBX - Cargill (Salt Division)
• CSCD - Cascade and Columbia River Railroad
• CSCX - Oglebay Norton; Coal Supply Corporation
• CSDX - Metropolitan Water Reclamation District of Greater Chicago
• CSGX - Central Sand and Gravel Company
• CSKR - C and S Railroad
• CSKU - Consolidated Services, Inc.
• CSL - Chicago Short Line Railway
• CSMX - Carol and Andy Muller
• CSNX - Cities Service Oil and Gas Corporation; Trident NGL, Inc.
• CSO - Connecticut Southern Railroad
• CSOR - Connecticut Southern Railroad
• CSOX - CITGO Petroleum Corporation
• CSP - Camas Prairie RailNet
• CSPX - Chesapeake Speciality Products; Cities Service Company
• CSRX - Conway Scenic Railroad
• CSRZ - CSX Transportation
• CSS - Chicago South Shore and South Bend Railroad
• CSTX - Canadian Starch Company (Casco)
• CSUX - City of Colorado Springs Department of Electric Generation
• CSVU - Compania Sud Americana de Vapores, GmbH
• CSWX - Central and South West Services, Inc.
• CSX - Central Transportation Company, Inc.
• CSXE - CSX Transportation End Of Train Devices
• CSXT - CSX Transportation
• CSXU - CSX Transportation
• CSXZ - CSX Transportation
• CSYX - Central Soya
• CT - Columbia Terminal Railroad
• CTCU - Container Trading Company
• CTCX - GE Railcar Services Corporation; Endasa, SA de CV
• CTE - Cen-Tex Rail Link
• CTEU - Spanish Lines
• CTEX - Canterra Energy, Ltd.; PLM International, Inc.
• CTGZ - Combined Transport Group, Inc.
• CTIE - Kansas City Southern Railway
• CTIU - CTI-Container Transport International, Inc.
• CTIX - Southeastern Industrial Enterprises, Inc.
• CTIZ - CTI-Container Transport International, Inc.
• CTKU - Container Tank Services, Ltd.
• CTLX - Endasa, SA de CV
• CTML - Cairo Terminal Railroad
• CTN - Canton Railroad
• CTNX - Continental Carbon
• CTOU - Chem-Rail Logistics, LLC
• CTPX - Certain Teed Corporation; Courtesy Corporation
• CTR - Clinton Terminal Railroad; Carlton Trail Railway
• CTRN - Central of Tennessee Railway and Navigation Company
• CTRR - Cloquet Terminal Railroad
• CTRU - Container Trading Company
• CTRW - Carlton Trail Railway
• CTRX - C and T Refinery, Inc.
• CTSU - Bibby Bros Company
• CTSX - CTS Cement Manufacturing, Inc. (Chem Comp Systems)
• CTSZ - Carotrans International
• CTTX - TTX Company
• CTUU - Container Trading Company
• CTVX - Cleveland Terminal and Valley Railway
• CTWU - Container Trading Company
• CTZZ - Continental Transportation Company
• CUEX - Colorado-Utility Electric Association
• CUOH - Columbus and Ohio River Rail Road
• CURB - Curtis Bay Railroad
• CUST - Chicago Union Station Company
• CUT - Cincinnati Union Terminal
• CUVA - Cuyahoga Valley Railway; ISG Cleveland Works Railway
• CV - Central Vermont Railway; Grand Trunk Western; Canadian National Railway
• CVC - Central Vermont Railway; Canadian National Railway
• CVQ - Grand Trunk Western Railroad; Canadian National Railway
• CVR - Cimarron Valley Railroad
• CVRX - Locomotive and Tower Preservation Fund, Ltd.
• CVRY - Caddo Valley Railroad
• CVRZ - Grand Trunk Western Railroad; Canadian National Railway
• CVSR - Cuyahoga Valley Scenic Railroad
• CVYR - Caddo Valley Railroad
• CW - Colorado and Wyoming Railway
• CWBX - C. W. Brooks, Inc.
• CWCX - Canandaigua Wine Company, Inc.
• CWCY - Caldwell County Railroad
• CWEX - Commonwealth Edison Company; Midwest Generation, LLC
• CWI - Chicago and Western Indiana Railroad
• CWIU - Con-Way Intermodal
• CWIZ - Con-Way Intermodal
• CWMX - Chemical Waste Management, Inc.
• CWP - Chicago, West Pullman and Southern Railroad; Chicago Rail Link
• CWR - California Western Railroad; CWR, Inc.
• CWRC - Central Wisconsin Railroad
• CWRL - Central Western Railway
• CWRO - Cleveland Works Railway
• CWRY - Commonwealth Railway
• CWRZ - Providence and Worcester Railroad
• CWSX - USS Fabrication Division (United States Steel Corporation)
• CWTX - ChemWest Industries, Inc.
• CWTZ - Con-Way Truckload Services
• CXCZ - CSX Lines, LLC
• CXIX - Chemical Exchange Industries, Inc.
• CXPZ - CSX Transportation
• CXR - Colorado Pacific Railroad
• CXRG - Colorado Pacific Rio Grande Railroad
• CXRZ - CSX Transportation
• CXVZ - CSX Intermodal, Inc.
• CYCY - Crystal City Railroad
• CYDX - Conrad Yelvington Distributors, Inc.
• CYTX - Construcciones Y Trituaraciones, SA de CV
• CYX - American Cyanamid Company
• CZ - Coahuila and Zacatecas Railway
• CZCX - Crown Zellerbach Corporation
• CZRY - Carrizo Gorge Railway