| 1 | PPHX | PCS Phosphate Co., Inc. | added 10/1997; 7/2000-7/2005 | | NAKINA |
| 2 | PPHX | National Car Co. | 1/1950-7/1954; eliminated 10/1955 | | NAKINA |
| 3 | PPHX | National Car Co. | Jan-52 | | NRHS |
| 4 | PPHX | PCS Phosphate Co., Inc. | added 10/97; 7/2000 | | NRHS |
| 5 | PPHX | *PEORIA, PEORIA HEIGHTS & WESTERN RAILROAD | | | PWRC |
| 6 | PPHX | *NATIONAL CAR CO. | | | PWRC |
| 7 | PPHX | +PCS PHOSPHATE COMPANY | | | PWRC |
| 8 | PPHX | PCS Phosphate | | | RSRV |
| 9 | PPHX | PCS PHOSPHATE COMPANY, INC. | | | SCAC4 |
