| 1 | SCIX | Samuel Cabot Inc. | 8/1920-4/1970; eliminated 7/1970 | | NAKINA |
| 2 | SCIX | Skeena Celluose, Inc. | added 10/1987; 1/1994; eliminated 7/1994 | | NAKINA |
| 3 | SCIX | General Electric Railcar Services Corp. | added 7/1994; eliminated 4/1998; added 4/1999; eliminated 1/2000 | | NAKINA |
| 4 | SCIX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 5 | SCIX | Samuel Cabot Inc. | 4/38-4/70; eliminated 7/70 | | NRHS |
| 6 | SCIX | Skeena Celluose, Inc. | added 10/87; 1/94; eliminated 7/94 | | NRHS |
| 7 | SCIX | General Electric Railcar Services Corp. | added 7/94; eliminated 4/98; added 4/99; eliminated 1/2000 | | NRHS |
| 8 | SCIX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 9 | SCIX | *SAMUEL CABOT INC | | | PWRC |
| 10 | SCIX | *SUNRISE COOPERATIVE, INC. | | | PWRC |
| 11 | SCIX | *SKEENA CELLULOSE, INC. | | | PWRC |
| 12 | SCIX | +(NATX) GENERAL ELECTRIC RAIL SERVICES CORPORATION | | | PWRC |
| 13 | SCIX | General Electric Rail Services Corporation | | | RSRV |
| 14 | SCIX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |