| Abbreviation | Definition |
|---|---|
| BSLU | Blue Star Line |
| BSLU | Blue Star Line Limited |
| BSM | Blue Streak Merchandise |
| BSMFF | Blue Streak Merchandise Fast Freight |
| BSMX | Bay State Milling |
| BSMX | Bay State Milling Company |
| BSOR | Buffalo Southern Railroad |
| BSOR | Buffalo Southern Railroad Incorporated |
| BSPX | Otter Tail Power |
| BSPX | Otter Tail Power Company |
| BSRX | Branson Scenic Railway |
| BSRX | Branson Scenic Railway Incorporated |
| BST | Bi-State Transit (MetroLink) |
| BSTRA | Bay State Trail Riders Association |
| BSTX | Bay State Milling (Trinitas Corporation) |
| BSTX | Trinitas Corporation |
| BSVY | Boone and Scenic Valley Railroad |
| BTAX | Air Liquide America Corporation. |
| BTAX | Big Three Lincoln-Alaska (Air Liquide America Corporation) |
| BTC | Birmingham Terminal |