| 1 | MACX | Mac Acquisitions, L.P. | added 10/1996; 7/2000-7/2005 | | NAKINA |
| 2 | MACX | Fruehauf Corp. | added 11/1973; 1/1975-1/1980; eliminated 7/1983 | | NAKINA |
| 3 | MACX | Magor Railcar Division, Fruehauf Corp. | eliminated 11/1973 | | NAKINA |
| 4 | MACX | Fruehauf Railcar Division, Fruehauf Corp. | added 7/1970 | | NAKINA |
| 5 | MACX | Magor Railcar Division, Fruehauf Corp. | added 7/1968; 4/1970; eliminated 7/1970 | | NAKINA |
| 6 | MACX | Magor Car Corp. | added 7/1961; 7/1965-10/1966; eliminated 10/1967 | | NAKINA |
| 7 | MACX | Mahaffey Commission Co. | 7/1935 | | NAKINA |
| 8 | MACX | Magor Car Corp. | 7/65-10/66; eliminated 10/67 | | NRHS |
| 9 | MACX | Magor Railcar Division, Fruehauf Corp. | added 7/68; 4/70 | | NRHS |
| 10 | MACX | Fruehauf Corp. | 1/75-1/80 | | NRHS |
| 11 | MACX | Mac Acquisitions, L.P. | added 10/96; 7/2000 | | NRHS |
| 12 | MACX | *MAGOR RAILCAR DIV., FRUEHOF CORP. | | | PWRC |
| 13 | MACX | +MAC ACQUISITIONS. L.P. | | | PWRC |
| 14 | MACX | Mac Acquisitions | | | RSRV |
| 15 | MACX | MAC ACQUISITIONS L P | | | SCAC4 |