| 1 | MIDX | Mitsui Rail Capital, LLG | 7/2005, eliminated 1/2010 | | NAKINA |
| 2 | MIDX | MRC Rail Services, LLC | added 4/1998; 7/2000 | | NAKINA |
| 3 | MIDX | Unitrain, Inc. | added 1/1994; eliminated 4/1998 | | NAKINA |
| 4 | MIDX | Midwest Energy Services Co. | added 4/1989; 1/1994 | | NAKINA |
| 5 | MIDX | Merchants Despatch Transportation Co. | added 10/1962; 7/1965-4/1970; eliminated 1/1973 | | NAKINA |
| 6 | MIDX | Midland Packing Co. | 8/1920 | | NAKINA |
| 7 | MIDX | Merchants Despatch Transportation Co. | 7/65-4/70; eliminated 1/73 | | NRHS |
| 8 | MIDX | Midwest Energy Services Co. | added 4/89; 1/94 | | NRHS |
| 9 | MIDX | Unitrain, Inc. | added 1/94; eliminated 4/98 | | NRHS |
| 10 | MIDX | MRC Rail Services, LLC | added 4/98; 7/2000 | | NRHS |
| 11 | MIDX | *MIDLAND PACKING CO. | | | PWRC |
| 12 | MIDX | *MERCHANTS DESPATCH TRANSPORTATION CO. | | | PWRC |
| 13 | MIDX | +MITSUI RAIL CAPITAL, LLC [MRC RAIL SERVICES LLP ; UNITRAIN, INC.; MIDWEST ENERGY SERVICES] | | | PWRC |
| 14 | MIDX | MRC Rail Services | | | RSRV |
| 15 | MIDX | Middlesex Bus Company | | US-NJ | TRAFFIC |
