| 1 | GROX | First Union Rail | added 10/1996; 7/2000-7/2005 | | NAKINA |
| 2 | GROX | USL Capital Rail Services | added 4/1994; eliminated 10/1996 | | NAKINA |
| 3 | GROX | U.S. Rail Services, Inc. | added 1/1993; 1/1994; eliminated 4/1994 | | NAKINA |
| 4 | GROX | Chrysler Rail Transportation Corp. | eliminated 1/1993 | | NAKINA |
| 5 | GROX | Growth Nonstock Cooperative, Inc. | added 7/1980; eliminated 10/1988 | | NAKINA |
| 6 | GROX | Georgia Rosin Products Co. | 8/1920-4/1947 | | NAKINA |
| 7 | GROX | Georgia Rosin Products Co. | Apr-38 | | NRHS |
| 8 | GROX | Growth Nonstock Cooperative, Inc. | added 7/80; eliminated 10/88 | | NRHS |
| 9 | GROX | Chrysler Rail Transportation Corp. | eliminated 1/93 | | NRHS |
| 10 | GROX | U.S. Rail Services, Inc. | added 1/93; 1/94; eliminated 4/94 | | NRHS |
| 11 | GROX | USL Capital Rail Services | added 4/94; eliminated 10/96 | | NRHS |
| 12 | GROX | First Union Rail | added 10/96; 7/2000 | | NRHS |
| 13 | GROX | *GEORGIA ROSIN PRODUCTS CO. | | | PWRC |
| 14 | GROX | +FIRST UNION RAIL[(RUSX) USL CAPITAL RAIL SERVICES; CHRYSLER RAIL TRANSPORTAION CORP.; GROWTH NONSTOP COOPERATIVE] | | | PWRC |
| 15 | GROX | Growth Nonstop Cooperative (First Union Rail) | | | RSRV |