| Abbreviation | Definition |
|---|---|
| BITY | Bristol Industrial Terminal Railway (Penn Eastern Rail Lines) |
| BITY | Penn Eastern Rail Lines Incorporated |
| BJGX | B. J. Gas Supply Incorporated |
| BJGX | BJ Gas Supply |
| BJHX | B. J. Hughes (BJ Titan Services) |
| BJHX | BJ Titan Services Company |
| BJOX | BJO Corp (Citicorp Railmark) |
| BJOX | Citicorp Railmark Incorporated |
| BJR | Brunswick Junior Railroaders |
| BJRY | Burlington Junction Railway |
| BKLU | Bank Line Limited |
| BKRR | Batten Kill Railroad |
| BKRR | Batten Kill Railroad Company Incorporated |
| BKRU | Baker Tanks |
| BKTY | Missouri-Kansas-Texas Railroad (Union Pacific Railroad) |
| BKTY | Union Pacific Railroad Company |
| BL | Branch Line |
| BLA | Baltimore and Annapolis Railroad |
| BLCX | Bankers Leasing Corp (The Commonwealth Plan) |
| BLCX | Commonwealth Plan Incorporated |