| Abbreviation | Definition |
|---|---|
| BPRC | Bergen Passaic Railway Corporation |
| BPRR | Buffalo and Pittsburgh Railroad |
| BPRR | Buffalo and Pittsburgh Railroad Incorporated |
| BPRX | Bergen Passaic Railway Corporation |
| BPTR | Bergen Passaic Terminal Railroad |
| BQCU | Bechtel International |
| BQR | Bay of Quinte Railway |
| BR | Barry Railway |
| BR | Bradford Industrial Rail |
| BR | Bradford Industrial Rail Incorporated |
| BR | British Rail |
| BRAN | Brandon Corporation |
| BRAX | Brae Corporation (CIT Equipment Finance Corporation) |
| BRAX | General Electric Railcar Services Corporation |
| BRB | British Railways Board |
| BRBX | Bombardier Transportation |
| BRC | Belt Railway Company of Chicago |
| BRC | Belt Railway of Chicago |
| BRCX | Bunge Corporation |
| BRCX | Bunge North America |