| 1 | KPX | Kaw Paving Co. | 1/1943-4/1961 (not listed) | | NAKINA |
| 2 | KPX | Kaw Paving Co. | 1/52-4/61 | | NRHS |
| 3 | KPX | KAW PAVING CO. | | | PWRC |
| 4 | KPXI | KAPEX | | | SCAC3 |
| 5 | KPXN | KP TRANSPORTATION | | | SCAC4 |
| 6 | KPXX | The Andersons-Rail Group | added 10/2004; 7/2005 | | NAKINA |
| 7 | KPXX | Progress Rail Services Corp. | added 7/1996; 7/2000; eliminated 10/2004 | | NAKINA |
| 8 | KPXX | Electric Fuels Corp. | added 7/1994; eliminated 7/1996 | | NAKINA |
| 9 | KPXX | Electric Fuels Corp. | added 7/94; eliminated 7/96 | | NRHS |
| 10 | KPXX | Progress Rail Services Corp. | added 7/96; 7/2000 | | NRHS |
| 11 | KPXX | THE ANDERSONS-RAIL GROUP [PROGRESS RAIL SERVICES CORP.; ONE EQUITY PARTNERS LLC](ELECTRIC FUELS CORP.) | | | PWRC |
| 12 | KPXX | Progress Rail Services Corporation (The Andersons) | | | RSRV |
| 13 | KPXX | ANDERSONS INC, THE | | | SCAC4 |
