| 1 | SIMX | Simms Oil Co. | 7/1930-7/1935 | | NAKINA |
| 2 | SIMX | Shippers Car Line Corp. | 7/1937 | | NAKINA |
| 3 | SIMX | North American Car Corp. | added 7/1964; 7/1965-4/1970; eliminated 7/1972 | | NAKINA |
| 4 | SIMX | Sierra Bag Co. | added 1/1983; eliminated 1/1989 | | NAKINA |
| 5 | SIMX | Sturgis Iron & Metal Co., Inc. | 7/2005 (not listed) | | NAKINA |
| 6 | SIMX | Ominsource Corp. | added 1/2009 | | NAKINA |
| 7 | SIMX | North American Car Corp. | added 7/64; 7/65-4/70 | | NRHS |
| 8 | SIMX | Sierra Bag Co. | added 1/83; eliminated 1/89 | | NRHS |
| 9 | SIMX | *SIMMS OIL CO. (SHIPPER' CAR LINE CORP.) | | | PWRC |
| 10 | SIMX | *NORTH AMERICAN CAR CORP. | | | PWRC |
| 11 | SIMX | *SIERRA BAG CO. | | | PWRC |
| 12 | SIMX | +STURGIS IRON & METAL CO., INC. | | | PWRC |
| 13 | SIMX | Sierra Bag | | | RSRV |
| 14 | SIMX | STURGIS IRON & METAL CO INC | | | SCAC4 |
