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.

G

• GA - Georgia Railroad, Seaboard System Railroad, CSX Transportation
• GAAB - South Carolina Central Railroad (Georgia and Alabama Division)
• GABX - General American Marks Company
• GACX - General American Marks Company, GATX Corporation
• GAEX - General American Marks Company
• GAFX - Fuller Company
• GALX - Georgia Power Company
• GAMX - General American de Mexico, Arrendadora Nacional De Carros De Ferrocaril
• GANO - Georgia Northern Railway
• GAOX - General American Transportation Corporation
• GAPX - Georgia-Pacific Corporation (Plaquemine Division), Georgia Gulf Corporation
• GARX - General American Transportation Corporation, GATX de Mexico, SA de CV
• GASC - Georgia, Ashburn, Sylvester & Camilla Railroad
• GASX - General American Marks Company
• GATU - Gateway Container Leasing
• GATX - General American Marks Company, GATX Corporation
• GAUX - General American Transportation Corporation
• GAYX - General American Transportation Corporation
• GBRX - Greenbrier Leasing Corporation
• GBRY - Gettysburg Railway
• GBRZ - Greenbrier Leasing Corporation
• GBW - Green Bay and Western Railroad; Fox Valley and Western Railroad; Wisconsin Central Railway; Canadian National Railway
• GBWX - Gerber Products Company; Sandoz; Novartis
• GC - Georgia Central Railway
• GCAU - GCA Transport
• GCCX - General American Marks Company
• GCDU - Overseas Container
• GCEU - Genstar Container Corporation
• GCEZ - Genstar Container Corporation
• GCFX - Alstom Canada Transport
• GCGX - Gulf Coast Grain
• GCIX - Gabriel Chemicals
• GCLX - Gold Coast Limited
• GCLZ - Global Chassis Leasing
• GCMX - National Railway Historical Society (Gold Coast Chapter)
• GCOX - Gold Coast Railroad Museum
• GCPU - Genstar (Burlington Northern and Santa Fe Railway; BNSF Railway)
• GCPX - Georgia Gulf Corporation (PVC Division)
• GCRX - Grand Canyon Railway
• GCSF - Gulf, Colorado and Santa Fe Railway
• GCSR - Gulf, Colorado and San Saba Railway
• GCSU - G.C.S. Containers Service, SA
• GCTU - Gulf Container Lines
• GCTX - General Chemical Corporation
• GCW - Garden City Western Railway
• GCX - Alltank Equipment Corporation, Honeywell
• GDCX - General American Marks Company
• GDJX - Grimmel Industries
• GDLK - Grand Elk Railroad
• GEAX - Trinity Rail Management
• GECX - GE Transportation
• GECZ - GE Capital Container Finance Corporation
• GEGX - GE Gas Turbine
• GELX - Garvey Elevators, Grain Marketing
• GEMX - GE Rail Services
• GENX - GE Rail Services
• GEOX - GEO Specialty Chemicals
• GEPX - Trinity Rail Management
• GETX - Getty Refining and Marketing Company, General American Marks Company
• GETY - Gettysburg Railroad (1976-1996)
• GETZ - Transport International Pool
• GEX - General Electric Company
• GEXR - Goderich-Exeter Railway (RailAmerica)
• GF - Central of Georgia Railroad, Norfolk Southern
• GFAX - Gordon Fay Associates
• GFC - Grand Falls Central Railway
• GFCX - Glens Falls Lehigh Cement Company
• GFCZ - General Foods Corporation
• GFHX - Commercial Credit Capital Corporation
• GFJX - Garret Railroad Car & Equipment
• GFLX - Greenfield Logistics
• GFR - Grand Forks Railway
• GFRR - Georgia & Florida Railroad
• GFSX - General American Marks Company
• GGCX - Georgia Gulf Corporation (Plaquemine Division)
• GGIX - Garvey International (Garvey Grain Division)
• GGMX - Golden Gate Railroad Museum
• GGPX - General American Marks Company
• GGS - South Carolina Central Railroad (Georgia Great Southern Division)
• GHBX - G. Heileman Brewing Company
• GHH - Galveston, Houston and Henderson Railroad
• GHRD - Green Hills Rural Development (Chillicothe-Brunswick Rail Maintenance Authority)
• GHRX - GHR Energy Corporation
• GIEX - General American Marks Company
• GIHX - Gifford-Hill & Company (Cornerstone C & M Incorporated); Hanson
• GILX - Gilman Paper Company
• GIMX - General American Marks Company
• GITM - Golden Isles Terminal Railroad
• GJ - Greenwich and Johnsonville Railway
• GJR - Guelph Junction Railway
• GKLX - Gold Kist
• GLBZ - Trac Lease
• GLC - Great Lakes Central Railroad
• GLCU - Flex-Van Leasing
• GLCX - Great Lakes Carbon
• GLKU - Great Lakes Chemical Corporation
• GLKX - Great Lakes Chemical Corporation
• GLLX - Great Lakes Locomotive Leasing
• GLNX - GLNX Corporation
• GLRX - Georgetown Loop Railroad
• GLSR - Gloster Southern Railroad
• GLSX - Glacier State Distribution Services
• GMCX - General Motors Corporation
• GMDX - General Motors Diesel Canada
• GMGX - M and G Polymers USA
• GMHX - General American Marks Company
• GMTX - General American Marks Company
• GMIX - Chicago Freight Car Leasing Company
• GMO - Gulf, Mobile and Ohio Railroad, Illinois Central Gulf Railroad, Illinois Central, Canadian National Railway
• GMRC - Green Mountain Railroad
• GMRY - Great Miami and Scioto Railway
• GMSR - Kansas City Southern Railway
• GN - Great Northern Railway, Burlington Northern Railroad, Burlington Northern and Santa Fe Railway; BNSF Railway
• GNA - Graysonia, Nashville and Ashdown Railroad, Kansas City Southern Railway
• GNAX - Holnam
• GNBC - Grainbelt Corporation, Farmrail
• GNCU - Gallatin National Company
• GNFX - Gainesville, Florida (City of)
• GNLX - Georgia Industrial Leasing Company
• GNRR - Georgia Northeastern Railroad
• GNTX - Railgon Company, TTX Corporation
• GNWR - Genesee and Wyoming Railroad
• GOCU - Greenfield Overseas Container
• GOCX - Gulf Oil Products Company, Chevron Phillips Chemical Company
• GOHX - General American Marks Company
• GONX - Railgon Company, TTX Corporation
• GOT - Greater Toronto Transit Authority
• GOTU - Gulf Overseas Towing
• GPBX - Georgia-Pacific Corporation
• GPCX - General Electric Company (General Purpose Control Department), Georgia-Pacific Corporation
• GPDX - General American Marks Company
• GPEX - General American Transportation Corporation
• GPFX - General American Marks Company, GATX Corporation
• GPIX - General Portland, Sunbelt Cement
• GPLU - Management Control and Maintenance
• GPLX - General American Marks Company
• GPMX - Georgia-Pacific Corporation (Mid Continent Wood Products Manufacturing Division)
• GPPX - Georgia-Pacific Corporation (Portland Division)
• GPSX - Georgia-Pacific Corporation (Eastern Wood Products Manufacturing Division)
• GPUX - GPU Service Corporation
• GR - Grand Rapids Eastern Railroad
• GRCX - Granite Rock Company (Graniterock)
• GRDX - Grand River Dam Authority
• GREX - Georgetown Rail Equipment Company
• GRFF - Georgia and Florida Railroad
• GRIV - Gauley River Railroad
• GRLW - Greenville & Western Railway Company (Western Carolina Railway Service Corporation)
• GRMX - Gopher State Railway Museum
• GRN - Greenville and Northern Railway (retired mark, line now abandoned)
• GRNR - Grand River Railway
• GRNW - Great Northwest Railroad
• GROI - Genesee Rail-One
• GROX - Growth Nonstop Cooperative, First Union Rail
• GRPX - General Chemical, CIT Financial
• GRR - Georgetown Railroad
• GRRX - Wampum Hardware
• GRRY - Grand River Railway
• GRSX - Gunderson Rail Services
• GRTX - Savage-Tolk Energy Services
• GRWR - Great Walton Railroad
• GRYR - Grenada Railway
• GRYX - John H. Grace Company, Transmatrix
• GSAX - Granite State Concrete Company
• GSCU - Eurotainer US
• GSCX - Greenville Leasing Company, General American Marks Company
• GSF - Georgia Southern and Florida Railway
• GSI - Gulf and Ship Island Railroad
• GSIX - Gas Supply, Williams Energy Ventures
• GSLX - George R Silcott Railway Equipment
• GSM - Great Smoky Mountains Railroad
• GSNX - Gulf States Utilities Company, Helm Financial Corporation
• GSOR - Indiana Hi-Rail Corporation
• GSPX - Great Southern Plywood Company
• GSRX - Golden Spike Railroad Services
• GSSX - Gopher State Scrap and Metal
• GSTU - Genstar Container Corporation
• GSUX - Girl Scouts USA
• GSW - Great Southwest Railroad
• GSWR - South Carolina Central Railroad (Georgia Southwestern Division)
• GSWX - G and S Company
• GT - Grand Trunk Railway
• GTA - Grand Trunk Western, Canadian National Railway
• GTAX - Harvest States Cooperative
• GTC - Gulf Transport
• GTEU - General Transport Equipment Company
• GTER - Grafton Terminal Railroad
• GTIS - Guilford Transportation Industries
• GTIZ - G. T. Intermodal USA
• GTLZ - G. T. Leasing
• GTP - Grand Trunk Pacific Railway (expired)
• GTPR - Grand Trunk Pacific Railway
• GTPZ - TIT Services
• GTR - Great River Railroad (Rosedale-Bolivar County Port Commission)
• GTRA - Golden Triangle Railroad
• GTTX - Trailer Train Company, TTX Company
• GTW - Grand Trunk Western, Canadian National Railway
• GTWQ - Grand Trunk Western, Canadian National Railway
• GTZZ - GT Trucking
• GU - Grafton and Upton Railroad
• GUAX - Georgia Power Company
• GUEX - General American Marks Company
• GURZ - Grafton and Upton Railroad
• GVCX - Glen-Valley Corporation
• GVDX - Oxy Vinyls
• GVSR - Galveston Railroad
• GWAX - Railroad Salvage and Restoration
• GWCX - Greenway Centre
• GWER - Gateway Eastern Railway; Kansas City Southern Railway
• GWF - Galveston Wharves
• GWHX - Stevens Energy
• GWIX - GWI Leasing Corporation
• GWR - Great Western Railway of Colorado
• GWRC - Georgia Woodlands Railroad
• GWRS - Great Western Railway (Saskatchewan)
• GWSR - Great Western Railway (Saskatchewan)
• GWSW - GWI Switching Services, LP
• GWWD - Greater Winnipeg Water District
• GWWE - Gateway Eastern Railway
• GWAG - Greenwood And Grizzly RailRoad
• GWWR - Gateway Western Railway
• GYLX - Gaylord Container Corporation