| 1 | ETRX | Arkansas Power & Light Co. | added 1/1996; 7/2000-7/2005 | | NAKINA |
| 2 | ETRX | Richards Tank Car Service | added 10/1961; 7/1965-10/1966; eliminated 7/1967 | | NAKINA |
| 3 | ETRX | Riley Bros. Oil Corp. (Evans-Thwing Refining Co.) | 8/1920 | | NAKINA |
| 4 | ETRX | Arkansas Power & Light Co. | added 1/96; 7/2000 | | NRHS |
| 5 | ETRX | *RILEY BROS. OIL CORP. [EVANS-THWING REFINING CO.] | | | PWRC |
| 6 | ETRX | +ARKANSAS POWER AND LIGHT COMPANY (RICHARDS TANK CAR SERVICE) | | | PWRC |
| 7 | ETRX | Evans-Thwing Refining (Arkansas Power and Light) | | | RSRV |
| 8 | ETRX | RICHARDS TANK CAR SERVICE | | | SCAC3 |
