| 1 | GACX | General American Marks Co. | added 1/1998; 7/2000-7/2005 | | NAKINA |
| 2 | GACX | General American Transportation Corp. | 7/1937-1/1994; eliminated 1/1998 | | NAKINA |
| 3 | GACX | General American Transportation Corp. | 4/38-1/94; eliminated 1/98 | | NRHS |
| 4 | GACX | General American Marks Co. | added 1/98; 7/2000 | | NRHS |
| 5 | GACX | GENERAL AMERICAN MARKS CO. [{GENERAL AMERICAN TRANSPORTATION CORP.] | | | PWRC |
| 6 | GACX | General American Marks (GATX Corporation) | | | RSRV |
| 7 | GACX | General American Marks Company | | USA | TRAFFIC |
