| 1 | AEPX | American Electric Power Service Corp. | added 4/1975; 1/1980-7/2005 | | NAKINA |
| 2 | AEPX | American Electric Power Service Corp. (cars being restencilled from APWX) | 1/1975 | | NAKINA |
| 3 | AEPX | Appalachian Power Co. | added 10/1958; 4/1961-4/1970; eliminated 4/1975 | | NAKINA |
| 4 | AEPX | Appalachian Electric Power Co. | 1/1943-10/1957; eliminated 10/1958 | | NAKINA |
| 5 | AEPX | Appalachian Electric Power Co. | 1/52-10/57; eliminated 10/58 | | NRHS |
| 6 | AEPX | Appalachian Power Co. | added 10/58; 4/61-4/70; eliminated 4/75 | | NRHS |
| 7 | AEPX | American Electric Power Service Corp. (cars being restencilled from APWX) | Jan-75 | | NRHS |
| 8 | AEPX | American Electric Power Service Corp. | added 4/75; 1/80-7/2000 | | NRHS |
| 9 | AEPX | AMERICAN ELECTRIC POWER SERVICE CORPORATION [APPALACHIAN POWER] | | | PWRC |
| 10 | AEPX | American Electric Power Service Corporation | | | RSRV |