| 1 | MWSX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 2 | MWSX | General Electric Railcar Services Corp. | added 10/1994; eliminated 1/2000 | | NAKINA |
| 3 | MWSX | Midwest Grain Products, Inc. | added 1/1986; 1/1994; eliminated 10/1994 | | NAKINA |
| 4 | MWSX | Midwest Solvents Co., Inc. | 1/1980; eliminated 1/1986 | | NAKINA |
| 5 | MWSX | Midwest Solvents Co., Inc. | 1/80; eliminated 1/86 | | NRHS |
| 6 | MWSX | Midwest Grain Products, Inc. | added 1/86; 1/94; eliminated 10/94 | | NRHS |
| 7 | MWSX | General Electric Railcar Services Corp. | added 10/94; eliminated 1/2000 | | NRHS |
| 8 | MWSX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 9 | MWSX | *MIDWEST GRAIN PRODUCTS, INC. [MIDWEST SOLVENTS CO.] | | | PWRC |
| 10 | MWSX | +GENERAL ELECTRIC RAILCAR SERVICES CORPORATION | | | PWRC |
| 11 | MWSX | Midwest Solvents (GE Rail Services) | | | RSRV |
| 12 | MWSX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |