| 1 | IRN | Consolidated Rail Corp. | 1/1980-1/1994 | | NAKINA |
| 2 | IRN | (The) Ironton R.R. Co. | 8/1920-10/1966 & 1/1975; eliminated 4/1976 | | NAKINA |
| 3 | IRN | Ironton R.R. Co. | 4/38-10/66 & 1/75; eliminated 4/76 | | NRHS |
| 4 | IRN | Consolidated Rail Corp. | 1/80-1/94 | | NRHS |
| 5 | IRN | CONSOLIDATED RAIL CORP. [IRONTON RAILROAD] | | | PWRC |
| 6 | IRN | Ironton Railroad (Conrail) | | | RSRV |
| 7 | IRN | Illinois RailNet, Inc. | Real: IR | USA | TRAFFIC |
| 8 | IRNB | IRONBOUND EXPRESS INC | | | SCAC4 |
| 9 | IRNK | INTERNATIONAL RACK USA | | | SCAC4 |
| 10 | IRNO | IRONHORSE TRANSPORT | | | SCAC4 |
| 11 | IRNU | SEACUBE CONTAINERS LLC | | USA | BIC |
| 12 | IRNU | Seacube Container Leasing | | | RSRV |
| 13 | IRNU | SEACASTLE CONTAINER LEASING LLC | | | SCAC4 |
