| (FW&D) Fort Worth and Denver Ry. Co. | FWD | 7/65-10/66 | |
| F.M. Yorke & Son, Ltd. | FMYX | 1/52-1/75 | |
| F.S. Royster Guano Co. | RCWX | 1/52-10/57 | |
| RCWX | added 10/59; 4/61-10/66; eliminated 10/68 | ||
| Fabrica de Jabon "La Rainera", S.A. | FLRX | 1/52-10/57; eliminated 1/59 | |
| Fabricated Metals, Inc. | FMIX | added 1/86; eliminated 7/86 | |
| Factor Gas Liquids Inc. | FGLX | added 1/96; 7/2000 | |
| Fagan Tank Line | FTLX | 1/52; eliminated 4/54 | |
| Fairbanks Morse, Inc. | FMIX | Apr-70 | |
| Fairmont and Western R.R. Co. | FWRD | added 1/85; eliminated 10/88 | |
| Fairmont Tamper | FTSX | added 1/97; eliminated 7/99; 7/2000 | |
| Fairport, Painesville & Eastern R.R. Co. | FPE | 4/38-10/66 & 1/75-1/80; eliminated 10/84 | |
| FAIX Leasing, Inc. | FAIX | Jul-00 | |
| Falcon Coal Co. | ABCX | added 10/78; 1/80 | |
| Falk Corp. | FALX | 1/80-7/2000 | |
| Falley Corp. | GALX | added 4/69; eliminated 7/69 | |
| GLPX | added 4/69; eliminated 7/69; 4/70 | ||
| JMBX | added 4/69; eliminated 7/69 | ||
| LEYX | added 4/69; eliminated 1/70 | ||
| PEGX | added 4/69; eliminated 7/69 | ||
| Falley Petroleum Co. | GALX | added 1/69; eliminated 4/69 | |
| GLPX | added 1/69; eliminated 4/69 | ||
| JMBX | added 1/69; eliminated 4/69 | ||
| LEYX | added 1/60; 4/61-10/66; eliminated 4/69 | ||
| LEYX | added 1/70; 4/70; eliminated 10/71 | ||
| PEGX | added 1/69; eliminated 4/69 | ||
| Falling Rock Cannel Coal Co. | FRCX | Apr-38 | |
| Falls Creek R.R. Co. | FCRK | eliminated 4/89 | |
| Falls Road R.R. Co., Inc. | FRR | Jul-00 | |
| Famers Commodities Transportation Co. | FCTX | added 1/97; 7/2000 | |
| Far Port Cooperative, Inc. | FTCX | added 1/81; eliminated 1/89 | |
| Far-Mar-Co., Inc. | EUGX | added 10/68; 4/70-1/80 | |
| WCDX | added 10/68; 4/70-1/80 | ||
| Farm-City Transport, Inc. | FRTX | Jul-00 | |
| Farmers Coop Grain and Supply Co. | MFCX | added 7/80; eliminated 4/89 | |
| Farmers Cooperative Association of York, Nebraska | SCYX | added 4/81; eliminated 7/88 | |
| Farmers Cooperative Co. | FCCX | added 4/80; eliminated 10/89 | |
| Farmers Cooperative Co. of Cleghorn, Ia | FARX | added 7/80; eliminated 1/90 | |
| Farmers Elevator Co. of Arthur, ND | AFEX | added 10/80; eliminated 4/89 | |
| Farmers Elevator Co. of Bondurant, IA | BAEX | added 10/83; eliminated 4/91 | |
| Farmers Elevator Co. of Westhope, N.D. | FELX | added 1/81; eliminated 10/83 | |
| Farmers Elevator, Inc. of Grace City | FEIX | 1/80-7/2000 | |
| Farmers' Grain & Shipping Co. | FG&S | Apr-38 | |
| Farmer's Grain and Feed Co., Inc. | FGIX | 1/75-1/80 | |
| Farmers Grain Cooperative | FGGX | added 10/90; 1/94-7/2000 | |
| Farmers Union Central Exchange, Inc. | FCEX | added 10/74; 1/75-1/94; eliminated 7/94 | |
| Farmland Industries, Inc. | FLIX | added 1/74; 1/75-7/2000 | |
| EUGX | eliminated 1/93; 1/94-7/2000 | ||
| WCDX | 1/94-7/2000 | ||
| Farmrail Corp. | FMRC | added 4/82; 1/94; eliminated 7/94; eliminated 10/95; 7/2000 | |
| Fayblock Materials | FBMX | added 10/96; eliminated 4/97; 7/2000 | |
| Fayette Power Project | FPPX | added 10/78; 1/80-7/2000 | |
| FDJ Leasing | CCAX | added 10/87; eliminated 10/93; 1/94-7/2000 | |
| Federal Barge Lines, Inc. | FBL | 10/57-10/66 & 1/75 | |
| Federal Grain Inspection Service (test scale cars) | FGWX | Jan-94 | |
| Federal Grain Inspection Service (USDA) (test scale cars) | FGWX | Jul-00 | |
| Federal Paper Board Co., Inc. | FPBX | added 4/75; 1/80-1/94; eliminated 10/95 | |
| Federal Rail Car Corp. | FRCX | 1/80; eliminated 7/81 | |
| Feldman Petroleum Co. | FPCX | Apr-38 | |
| Feliciana Eastern R.R. Co. | FERR | 1/75-1/80 | |
| Fels & Co. | FELX | 4/38-4/61; eliminated 7/64 | |
| Fels & Co. (Purez Corp., Ltd.) | FELX | Oct-66 | |
| Ferdinand & Huntingburg R.R. | LNAC | added 4/88 | |
| Ferdinand & Huntingburg R.R. Co. | FHRR | added 4/88; eliminated 10/91; 1/94 | |
| Ferdinand & Huntington R.R. | FRDN | eliminated 4/88 | |
| Ferdinand R.R. | FRDN | 1/75-1/80; added 7/80; eliminated 10/80 | |
| Ferdinand R.R. Co. | FRDN | added 10/80; eliminated 4/88 | |
| Ferrellgas, L.P. | FNAX | Jul-00 | |
| Ferro Standard Corp. | FSCX | added 10/66; 10/66; eliminated 10/68 | |
| Ferrocarril de Minatitlan al Carmen | FDMA | 1/75-1/80 | |
| Ferrocarril de Nacozari, Sct. | FCDN | 1/75-1/80 | |
| Ferrocarril del Chihuahua Al Pacifico, S.A. | CHP | 1/75; eliminated 4/78 | |
| Ferrocarril del Chihuahua Al Pacifico, S.A. de C.V. | CHP | added 4/78; 1/80 | |
| Ferrocarril del Chihuahua Al Pacifico, S.A. de C.V. (transferred to Ferrocarriles Nacionales de Mexico) | CHP | eliminated 10/88 | |
| Ferrocarril del Pacifico, S.A. de C.V. | FCP | 10/57-10/66 & 1/75-1/80; eliminated 4/88 | |
| Ferrocarril del Sureste, S.A. de C.V. | FSRR | Jul-00 | |
| Ferrocarril Mexicano | FCM | 4/61-7/65 | |
| Ferrocarril Mexicano, S.D. de C.V. | FXE | added 4/98; 7/2000 | |
| Ferrocarril Nacional de Tehuantepec (Tehuantepec National) | NDT | 1/75-1/80 | |
| Ferrocarril Sonora Baja California, S.A. de C.V. | SBC | 1/75-1/80 | |
| Ferrocarril Sonora Baja California, S.A. de C.V. (transferred to Ferrocarriles Nacionales de Mexico) | SBC | eliminated 10/88 | |
| Ferrocarriles Mexicano (Mexican) | FCM | 1/75-1/80 | |
| Ferrocarriles Nacionales de Mexico | FCM | 10/66-4/70 | |
| FCM | 1/94-7/2000 | ||
| FCP | 1/94-7/2000 | ||
| FNE | added 4/96; eliminated 10/97 | ||
| FPN | added 4/96; 7/2000 | ||
| FST | added 4/96; 7/2000 | ||
| FUS | added 10/88; 1/94-7/2000 | ||
| CHP | added 10/88; 1/94-7/2000 | ||
| NDM | 1/94-7/2000 | ||
| SBC | added 10/88; 1/94-7/2000 | ||
| TVX | added 4/96 | ||
| Ferrocarriles Nacionales de Mexico (National Rys. of Mexico) | NDM | Jan-75 | |
| Ferrocarriles Nacionales de Mexico (National Rys. of Mexico) (cars actually marked NdeM) | NDM | Jan-80 | |
| Ferrocarriles Nacionales de Mexico-Region Pacifico | FCP | added 4/88; eliminated 10/88 | |
| Ferrocarriles Nacionales de Mexico-Region Pacifico (transferred to Ferrocarriles Nacionales de Mexico) | FCP | added 10/88 | |
| Ferrocarriles Unidos del Sureste, S.A. de C.V. | FUS | 1/75-1/80 | |
| Ferrocarriles Unidos del Sureste, S.A. de C.V. (transferred to Ferrocarriles Nacionales de Mexico) | FUS | eliminated 10/88 | |
| Ferrocarrils Nacionales De Mexico | TVM | Jul-00 | |
| Ferrocarrils Nacionales de Mexico (National Rys. of Mexico) | MGRS | 1/75-1/80 | |
| Ferrocarrils Unidos del Sureste, S.A. de C.V. | SE | 1/75-1/80 | |
| FerroDJJ S.A. de C.V. | ENDX | eliminated 4/2000 | |
| Ferroquadrum, S.A. de C.V. | ENDX | added 1/94; 1/94 | |
| Fiber Industries, Inc. | FILX | added 10/88; eliminated 10/92 | |
| Fibers and Plastics Co. (Allied Chemical Corp.) | AFPX | added 1/80; 1/80; eliminated 5/83 | |
| Fibers and Plastics Co. (Allied Corp.) | AFPX | added 5/83; eliminated 1/90 | |
| Fibers Division (Allied Signal, Inc.) | AFPX | added 1/90; 1/94; eliminated 1/95 | |
| Fidelity Oil Co. (The British American Oil Co., Ltd.) | FOKX | Apr-38 | |
| Filmore Western Ry. Co. | FWRY | Jul-00 | |
| Filtered Rosin Products Co. | FRPX | added 10/69; 4/70; eliminated 4/71 | |
| Finger Lakes Ry. Corp. | FGLK | added 10/95; 7/2000 | |
| Finley Co. Inc. | FINX | 10/57-10/66; eliminated 10/67 | |
| Firestone Plastics Co. | FPCX | added 7/79; 1/80; eliminated 10/81 | |
| First Mississippi Corp. | FMCX | added 10/58; 4/61-10/66; eliminated 1/70 | |
| FMCX | added 1/72; 1/75 | ||
| First Security Bank National Association | ESCX | added 4/2000; 7/2000 | |
| First Union Properties, Inc. | ACDX | 7/65-1/80; eliminated 7/84 | |
| ACSX | 7/65-1/94; eliminated 1/99 | ||
| GCX | Jul-65 | ||
| First Union Rail | FURX | added 7/95; 7/2000 | |
| CHMX | added 4/2001 | ||
| COOX | added 10/96; 7/2000 | ||
| GROX | added 10/96; 7/2000 | ||
| MFCX | added 10/96; 7/2000 | ||
| NDYX | added 10/96; 7/2000 | ||
| PRAX | added 7/96; 7/2000 | ||
| RUSX | added 10/96; 7/2000 | ||
| SCYX | added 10/96; 7/2000 | ||
| TGOX | added 10/96; 7/2000 | ||
| TQEX | added 10/96; 7/2000 | ||
| TRGX | added 4/96; 7/2000 | ||
| UMPX | added 4/96; 7/2000 | ||
| WFIX | added 1/2001 | ||
| WSOX | added 4/96; 7/2000 | ||
| XTRX | added 10/96; 7/2000 | ||
| Fiske Brothers Refining Co. | FBRX | 4/38-10/66; eliminated 1/70 | |
| FIXCOR Industries, Inc. | AFIX | Jul-00 | |
| Flamegas Leasing Corp. | FLGX | added 1/74 | |
| Flamegas Transportation Systems, Inc. | FLGX | Jan-75 | |
| Flamingo Spring Water Co. | FSWX | Apr-38 | |
| Flamingo Water Co. | FSWX | 1/52; eliminated 1/53 | |
| Flats Industrial R.R. Co. | FIR | Jul-00 | |
| Fleishman's Pickles, Inc. | FPX | Apr-38 | |
| Flex Leasing Corp. | FLCX | added 7/97; 7/2000 | |
| FLOX | added 7/97; 7/2000 | ||
| Flexsys America L.P. | FLAX | Jul-00 | |
| Flint River & Northeastern R.R. | FR&N | 4/38-1/52 | |
| Flintkote Co. of Canada Ltd. | FKRX | 1/52-7/65 | |
| Flintkote Roads, Ltd. (Colas Roads, Ltd.) | FKRX | Apr-38 | |
| FLO CO (superscript: 2) Inc. | FCOX | Jul-00 | |
| Float-Away Door Co. | FLOX | Apr-70 | |
| Florida Central R.R. Co., Inc. | FCEN | added 4/87; 1/94 | |
| FCEN | added 4/97; 7/2000 | ||
| Florida Crushed Stone Co. | FCSX | added 7/84; 1/94-7/2000 | |
| Florida East Coast Ry. Co. | FEC | 1/75-7/2000 | |
| Florida Gas Terminals, Inc. | FGTX | eliminated 10/91 | |
| Florida Gulf Coast R.R. Museum, Inc. (passenger cars) | FGCX | 1/94-7/2000 | |
| Florida Midland R.R. Co., Inc. | FMID | added 1/88; 1/94-7/2000 | |
| Florida Northern R.R. Co. Inc. | FNOR | 1/94-7/2000 | |
| Florida Rock Industries, Inc. | HMFX | 1/80; eliminated 5/83; 1/94-7/2000 | |
| Florida West Coast R.R., Inc. | FWCR | added 4/88; 1/94; eliminated 1/98; 7/2000 | |
| Floydada and Plainview R.R. Co. | FAPR | added 7/90; 1/94; eliminated 1/95; 7/2000 | |
| Fluor Daniel Fernald | OHFX | Jul-00 | |
| FMC Corp. | FMLX | 7/65-10/66 | |
| FMLX | 1/94-7/2000 | ||
| FMOX | added 10/65; 10/66 | ||
| FMOX | eliminated 7/93; 1/94; eliminated 10/97; 7/2000 | ||
| AVCX | eliminated 10/66 | ||
| AVDX | added 10/66; 10/66 | ||
| AVDX | eliminated 1/79 | ||
| BECX | Oct-66 | ||
| BECX | eliminated 7/93; 1/94; eliminated 10/97; 7/2000; added 10/2000 | ||
| TGSX | added 4/2000; 7/2000 | ||
| FMC Corp., American Viscose Division | AVCX | Jul-65 | |
| AVDX | 4/70-1/75 | ||
| FMC Corp., Inorganic Chemicals Division | FMLX | 4/70-1/80 | |
| FMOX | 4/70-1/80 | ||
| BECX | Jul-65 | ||
| BECX | 4/70-1/80 | ||
| Foley Butane Co., Inc. | FBCX | 1/52-10/57 | |
| Fonda, Johnstown & Gloversville R.R. Co. | FJG | 1/75; added 4/75; 1/80; eliminated 10/88 | |
| Fonda, Johnstown & Gloversville R.R. Co. (transferred to New York, Susquehanna and Western Ry. Corp.) | FJG | added 10/88 | |
| Foote Mineral Co. | VCAX | added 1/68 | |
| VCAX | added 7/68; eliminated 4/69 | ||
| Foote Mineral Co.--Vancoram Operations | VCAX | eliminated 7/68 | |
| Ford County Historical R.R. Preservation Foundation | FBDC | 1/94-7/2000 | |
| Ford Motor Co. | FRDX | 4/38-4/61 | |
| Fordyce & Princeton R.R. Co. | FP | 1/75-1/80; added 4/81; 1/94-7/2000 | |
| Fore River R.R. Corp. | FOR | 1/75-1/80 | |
| Fore River Ry. Co., Inc. | FRY | eliminated 10/92; 1/94 | |
| Fore Terminal, Inc. | FTIX | added 7/66; 10/66 & 1/75 | |
| Foremost International, S.A. | FFCX | added 4/68; 4/70; eliminated 10/70 | |
| Forest Products Chemical Co. | FPDX | 4/38-7/65; eliminated 10/66 | |
| Formosa Plastics Corp. U.S.A. | FPAX | added 4/81; 1/94; eliminated 1/98 | |
| Formosa Transrail Corp. | FPAX | added 1/98; 7/2000 | |
| Fort Myers Southern R.R. Co. | FMS | 1/75-1/80 | |
| Fort Smith & Van Buren Ry. Co. | FSVB | 1/75-7/2000 | |
| Fort Smith & Western R.R. | FSW | 4/38-1/52 | |
| Fort Smith R.R. Co. | FSR | added 1/92; 1/94-7/2000 | |
| Fort Street Union Depot Co. | FSUD | 1/75-7/2000 | |
| Fort Wayne Union | FWU | 1/75-1/80 | |
| Fort Worth & Dallas Belt R.R. | FWDB | Jul-00 | |
| Fort Worth & Dallas R.R. Co. | FWDR | 1/94-7/2000 | |
| Fort Worth & Denver City Ry. | FW&D | 4/38-10/57 | |
| Fort Worth & Denver Ry. | FW&D | Apr-61 | |
| Fort Worth & Western R.R. Co. | FWWR | added 10/90; 1/94-7/2000 | |
| Fort Worth and Denver Ry. Co. | FWD | 1/75-1/80; eliminated 1/83 | |
| Fort Worth Belt Ry. Co. | FWB | Jan-75 | |
| Fort Worth-Denver (Burlington Refrigerator Express Co.) | FWDX | Apr-38 | |
| Foss Launch & Tug | FLT | 1/75-7/2000 | |
| Foster Poultry Farms, Inc. | FPFX | added 4/80; 1/94; eliminated 4/97 | |
| Foster Wheeler Ltd. | FWLX | added 4/92; 1/94-7/2000 | |
| Fox River Valley R.R. Corp. | FRVR | added 4/89; eliminated 1/94 | |
| Fox Valley & Western, Ltd. | FRVR | added 1/94; 7/2000 | |
| FVW | added 1/94; 7/2000 | ||
| AHW | added 1/94; 7/2000 | ||
| GBW | added 1/94; 1/94-7/2000 | ||
| Foxley Cattle Co. | FCCX | 1/94-7/2000 | |
| FPB Leasing Corp. | FPBX | added 10/95 | |
| Frank Mitacek Railway Service | FSCX | added 1/83; eliminated 1/89 | |
| Frankfort & Cincinnati R.R. Co. | FCIN | 1/75-1/80; eliminated 4/86 | |
| Franklin County R.R. Corp. | FCYR | added 4/86; eliminated 4/88 | |
| Franklin Creek Refining Corp. | FCRX | Apr-38 | |
| Frazier Brokerage Co. | FTCX | 1/52; eliminated 4/54 | |
| Fred Rives Transportation Co. | FRTX | 7/65-10/66 | |
| Fred Rives Transportation Co., Fred Rives Sr., owner | FRTX | 1/52-4/61 | |
| FRTX | Apr-70 | ||
| Fredonia Valley R.R. Inc. | FVRR | Jul-00 | |
| Freeman Gas of N.C., Inc. | BOBX | added 1/71; 1/75-7/2000 | |
| Freeport Mexican Fuel Oil Corp. (Sinclair Refining Co.) | FMTX | Apr-38 | |
| Freeport Sulphur Co. | FSCX | 4/38; added 7/58; eliminated 10/58 | |
| DVLX | added 7/96 | ||
| Freeport Sulphur Co., a Division of Freeport-McMoRan Resource Partners, Ltd. | DVLX | eliminated 4/98 | |
| Freeport-McMoRan Sulphur Inc. | DVLX | added 4/98; eliminated 1/99 | |
| Freeport-McMoRan Sulphur LLC | DVLX | added 1/99; 7/2000 | |
| Freight Equipment Management Co. | FEMX | added 7/78; 1/80; eliminated 4/89 | |
| Freight Services, Inc. | FSIX | 1/94; added 10/94; eliminated 10/96 | |
| Fremont Elevator Co. | FREX | added 7/70; eliminated 10/74 | |
| Fremont Grain Co. | FGEX | added 1/88 | |
| FGFX | eliminated 7/89 | ||
| Fremont, West Point & Pacific Ry., Inc. | FWPP | added 4/88; eliminated 1/91 | |
| Frit Industries | FRTX | added 7/78 | |
| Frit Industries, Inc. | FRTX | eliminated 1/79 | |
| Frit Transportation, Inc. | FRTX | added 1/79; 1/80; eliminated 4/91 | |
| Frontier Cooperative Co. | DDDX | added 4/91; eliminated 10/92; 1/94-7/2000 | |
| Frontier Tank Car Co. | FTX | 1/52; eliminated 4/55 | |
| FRP Co. | FRPX | added 4/71; 1/75; eliminated 4/76 | |
| Fruehauf Corp. | MACX | 1/75-1/80 | |
| Fruit Growers Express | TICX | Jul-65 | |
| Fruit Growers Express Co. | FCEX | 1/52; eliminated 10/53 | |
| FDEX | 4/38-4/70; eliminated 10/74; 1/75 | ||
| FGCX | 4/61-1/80; eliminated 10/81; eliminated 1/82 | ||
| FGER | added 1/80; 1/80-7/2000 | ||
| FGEX | 4/38-10/66 & 1/75-1/80; eliminated 10/80 | ||
| FGMR | added 10/80; 1/94-7/2000 | ||
| FHIX | 1/52-1/75; eliminated 7/78 | ||
| FOBX | 1/52-1/75; eliminated 4/75 | ||
| FRMR | eliminated 1/95 | ||
| CPDX | Jan-52 | ||
| CSNX | Jan-52 | ||
| EKSX | 1/52-7/65 | ||
| EMPX | 1/52-4/61 | ||
| GEPX | 10/57-7/65 | ||
| JSSX | 10/57-4/61 | ||
| NRBX | added 7/99; 7/2000 | ||
| NX | 1/52-7/65 | ||
| NX | Apr-70 | ||
| NX | added 1/72; 1/75-1/80; eliminated 4/82 | ||
| OMX | 10/57-4/61 | ||
| PPIX | 1/52-10/57 | ||
| RBNX | 10/57-1/80; eliminated 10/89; 1/94 | ||
| TICX | Apr-70 | ||
| TICX | added 1/72; 1/75; eliminated 1/75 | ||
| WPRX | added 7/68; 4/70-1/75; eliminated 7/78 | ||
| WPWX | added 7/81; eliminated 4/82 | ||
| Frye & Co. | FRYX | 4/38-4/61 | |
| FSIX Inc. | FSIX | Jul-00 | |
| FTIX Associates | FTIX | Jan-80 | |
| Fuel Supply Trust | FSTX | added 1/97; 7/2000 | |
| Fuelane Corp. | FCX | 1/52-10/57; eliminated 7/59 | |
| Fuller Co. | GAFX | 1/94-7/2000 | |
| Fulton County R.R., Inc. | FC | Jul-00 | |
| Fun Trains, Inc. | FFTX | Jul-00 | |
| Funding Systems Railcars Leasing, Inc. | FSRX | added 4/81; eliminated 7/82 | |