| 1 | CMCX | Sweetman Construction Co. | added 7/1991; 1/1994-7/2005 | | NAKINA |
| 2 | CMCX | Climax Molybdenum Co. | 4/1938-1/1943 (not listed) | | NAKINA |
| 3 | CMCX | J.J. Clifford | 1/1950 | | NAKINA |
| 4 | CMCX | Chem-Met Corp. | added 4/1960; 4/1961; eliminated 7/1964 | | NAKINA |
| 5 | CMCX | Chem-Met Corp. | 4/61; eliminated 7/64 | | NRHS |
| 6 | CMCX | Sweetman Construction Co. | added 7/91; 1/94-7/2000 | | NRHS |
| 7 | CMCX | *CLIMAX MOLYBDENUM CO. | | | PWRC |
| 8 | CMCX | *J. J. CLIFFORD | | | PWRC |
| 9 | CMCX | *CHEM-MET CORP. | | | PWRC |
| 10 | CMCX | *CMC RAILROAD INC | | | PWRC |
| 11 | CMCX | +SWEETMAN CONSTRUCTION COMPANY | | | PWRC |
| 12 | CMCX | CMC Railroad (Sweetman Construction) | | | RSRV |
| 13 | CMCX | SWEETMA | | | SCAC4 |
| 14 | CMCX | Cuban Molasses Co. | | USA | TRAFFIC |
