| 1 | RCMX | Services Unlimited | added 1/1994; eliminated 4/2000; 7/2000-7/2005 (not listed) | | NAKINA |
| 2 | RCMX | Railroad Car Management Co., Inc. | added 4/1985; eliminated 1/1994 | | NAKINA |
| 3 | RCMX | Ringgold Coal Mining Co. | added 10/1975; eliminated 10/1977; 1/1980 | | NAKINA |
| 4 | RCMX | Red ""C"" Oil Manufacturing Co. | 8/1920-7/1923 | | NAKINA |
| 5 | RCMX | Ringgold Coal Mining Co. | Jan-80 | | NRHS |
| 6 | RCMX | Railroad Car Management Co., Inc. | added 4/85; eliminated 1/94 | | NRHS |
| 7 | RCMX | Services Unlimited | added 1/94; eliminated 4/2000; 7/2000 | | NRHS |
| 8 | RCMX | *RED "C" OIL MANUFACVTURING CO. | | | PWRC |
| 9 | RCMX | *RINGGOLD COAL MINING CO. | | | PWRC |
| 10 | RCMX | +SERVICES UNLIMITED [RAILROAD CAR MANAGEMENT CO.] | | | PWRC |
| 11 | RCMX | Services Unlimited | | | RSRV |
| 12 | RCMX | SERVICES UNLIMITED | | | SCAC4 |
