| Abbreviation | Definition |
|---|---|
| FANU | Brenner Tank Incorporated |
| FAPR | Floydada and Plainview Railroad |
| FARL | Fully Automated Rail Layer |
| FARX | Farmers Cooperative of Cleghorn, Iowa |
| FAZU | STP Shipping And Trading |
| FBAU | Ahlers Lines NV |
| FBDC | Ford County Historical Railroad Preservation Foundation |
| FBFU | Marine Transworld Equipment Corporation |
| FBG | Fredricksburg Station (Virginia Railway Express - AMTK) |
| FBMU | CIE Maritime Belge |
| FBMU | CIE Maritime Belge S. A. |
| FBMX | Fayblock Materials |
| FBSU | Franco Belgian Services |
| FBZU | China Ocean Shipping |
| FBZU | China Ocean Shipping Company |
| FC | Fulton County Railroad |
| FC | Fulton County Railroad Incorporated |
| FCCM | Compania de Ferrocarriles Chiapas Mayab de CV |
| FCCR | First Coast Commuter Rail |
| FCCX | Farmers Cooperative (Finova Capital Corporation) |