Real world company prefixes
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I& IA IB IC ID IE IF IG IH II IJ IK IL IM IN IO IP IQ IR IS IT IU IV IW IX IY IZ
IUI IUK IUM IUS IUT IUX
I& IA IB IC ID IE IF IG IH II IJ IK IL IM IN IO IP IQ IR IS IT IU IV IW IX IY IZ
IUI IUK IUM IUS IUT IUX
| 1 | IU | Illinois Union Ry. Co. | Apr-38 | NRHS | |
| 2 | IU | INDIANAPOLIS UNION RAILWAY | PWRC | ||
| 3 | IU | Indianapolis Union | added 10/1976; 7/2000-7/2005 | NAKINA | |
| 4 | IU | (The) Indianapolis Union Ry. (Co.) | 7/1923-1/1975; eliminated 10/1976; 1/1980-1/1994; eliminated 1/1998 | NAKINA | |
| 5 | IU | Indianapolis Union | RSRV | ||
| 6 | IU | Indianapolis Union Ry. | 1/52-1/94; eliminated 1/98 | NRHS | |
| 7 | IU | Indianapolis Union | Jul-00 | NRHS | |
| 8 | IUIC | ITL USA INC | SCAC4 | ||
| 9 | IUKG | ISLANDWIDE COURIER INC | SCAC4 | ||
| 10 | IUMC | INTERUNITY MANAGEMENT CORPORATION S | SCAC4 | ||
| 11 | IUS | Icarus | ICAO1 | ||
| 12 | IUSI | INTERLOG USA INC | SCAC4 | ||
| 13 | IUTR | IMPERIAL TRANSPORT CO LTD | SCAC4 | ||
| 14 | IUX | Industrias Unidas de Nuevo Laredo, S.A. | 1/52-7/65; eliminated 10/65 | NRHS | |
| 15 | IUX | INDUSTRIAS UNIDAS DE NUEVO LAREDO, SA | PWRC | ||
| 16 | IUX | Industrias Unidas de Nuevo Laredo, S.A. | 1/1943-7/1965; eliminated 10/1965 | NAKINA |