| Abbreviation | Definition |
|---|---|
| BFIX | Bethlehem Steel Corporations |
| BFJR | Brillion and Forest Junction Railroad |
| BFPX | Besse Forest Products |
| BFRR | Bloemfontein Railway |
| BFRR | Buffalo Ridge Railroad Incorporated |
| BFRT | Bruce Freeman Rail Trail |
| BFRX | Bakery Trading |
| BFSU | Bailee Freight Services |
| BFSU | Bailee Freight Services Limited |
| BFTX | Bill Frank Rail Service |
| BG | Broad Gauge |
| BGCM | Bountiful Grain and Craig Mountain Railroad |
| BGEX | GATX Capital Corporation |
| BGEX | General American Marks (GATX Corporation) |
| BGFX | Barnabas Group Foundation |
| BGKU | Bayer Pharma |
| BGKU | Schering AG |
| BGSX | Strata Corporation |
| BH | Bath and Hammondsport Railroad (B and H Rail Corporation) |
| BHCR | Black Hills Central Railroad |