| Abbreviation | Definition |
|---|---|
| IBCX | Indiana Boxcar Corporation |
| IBKU | Interbulk,Inc |
| IBMZ | International Business Corporation |
| IBNU | Interpool Container Pty |
| IBNU | Interpool Container Pty Limited |
| IBORAILWAY | Irondale Bancroft & Ottawa Railway |
| IBPX | Iowa Beef Packers (Trinity Industries Leasing Co.) |
| IBPX | Trinity Industries Leasing Company |
| IBT | International Bridge and Terminal |
| IBT | International Bridge and Terminal Company |
| IBVE | Iberia and Vermillion Railroad |
| IBYU | Tuscola and Saginaw Bay Railway |
| IBYU | Tuscola and Saginaw Bay Railway Company |
| IC | Illinois Central Railroad (Canadian National Railway) |
| IC | Illinois Central Railroad Company |
| ICAU | Icon International Container Service |
| ICCU | ICCU Containers |
| ICCU | ICCU Containers Incorporated |
| ICCX | International Catalyst Corporation |
| ICCZ | International Mineral Corporation |