| 1 | GMO | Illinois Central R.R. Co. | added 4/1988; 1/1994-7/2005 | | NAKINA |
| 2 | GMO | Illinois Central Gulf R.R. Co. | eliminated 4/1988 | | NAKINA |
| 3 | GMO | Illinois Central Gulf R.R. Co. (Gulf, Mobile & Ohio R.R. Co.) | 1/1975-1/1980 | | NAKINA |
| 4 | GMO | Illinois Central Gulf R.R. Co. (Gulf, Mobile & Ohio R.R. Co.) | 1/75-1/80 | | NRHS |
| 5 | GMO | Illinois Central Gulf R.R. Co. | eliminated 4/88 | | NRHS |
| 6 | GMO | Illinois Central R.R. Co. | added 4/88; 1/94-7/2000 | | NRHS |
| 7 | GMO | CANADIAN NATIONAL RAILWAY [ILLINOIS CENTRAL RAILROAD; GULF, MOBILE & OHIO RR] | | | PWRC |
| 8 | GMO | Gulf, Mobile and Ohio Railroad (Canadian National Railway) | | | RSRV |
| 9 | GMO | Gulf, Mobil & Ohio Railroad | | USA | TRAFFIC |
| 10 | GMOC | GAS MART OIL COMPANY | | | SCAC4 |
| 11 | GMOI | GRUPO MANUFACTURERO RIO GRANDE SA D | | | SCAC4 |
| 12 | GMOL | G & M OIL CO NC | | | SCAC4 |
| 13 | GMOM | GRUPO MONARCA | | | SCAC4 |
| 14 | GMON | GROUPE MONITRANS | | | SCAC4 |
| 15 | GMOS | Migros Ostschweiz | | CH | VKM |
| 16 | GMOT | GLEN MOORE TRANSPORT, INC. | | | SCAC1 |
| 17 | GMOT | GLEN MOORE TRANSPORT INC | | | SCAC4 |
| 18 | GMOU | GOLD STAR LINE LTD | | HK | BIC |
| 19 | GMOV | GUARDIAN MOVING & STORAGE | | | SCAC4 |
