| Abbreviation | Definition |
|---|---|
| RJCR | R. J. Corman Railroad Corporation |
| RJCR | R.J. Corman Railroad Bardstown Line |
| RJCW | R. J. Corman Railroad Company/ Western Ohio Line |
| RJCW | R.J. Corman Railroad Western Ohio Line |
| RJIS | Rail Journey Information Service |
| RJNX | R. H. Bogle |
| RJPM | Rajapalayam |
| RJRX | A C F Industries Incorporated |
| RJRX | R.J. Roesling & Co. (ACF Industries) |
| RKCX | Knox Kershaw |
| RKCX | Knox Kershaw, Incorporated |
| RKGX | River King Coal |
| RKMW | Chicago, Rock Island and Pacific Railroad |
| RKTZ | TAL International |
| RKTZ | Transamerica Leasing, Incorporated |
| RL | Rutland Line |
| RL | Rutland Line Incorporated |
| RLA | Railway Labor Act |
| RLAX | Rail Logix |
| RLCX | RELCO |