| 1 | POX | Alabama Power Co. | added 1/2000 | | NAKINA |
| 2 | POX | Union Tank Car Co. | 7/1937-4/1938 | | NAKINA |
| 3 | POX | The Pure Oil Co. | 8/1920-7/1932 | | NAKINA |
| 4 | POX | The Pure Oil Co. (Union Tank Car Co.) | 7/1935 | | NAKINA |
| 5 | POX | Alabama Power Co. | added 1/2000 | | NRHS |
| 6 | POX | *PURE OIL CO. (UNION TANK CAR CO.) | | | PWRC |
| 7 | POX | *ALABAMA POWER CO. | | | PWRC |
| 8 | POXC | PRIORITY ONE TRANSPORT INC L | | | SCAC4 |
| 9 | POXD | PASSARO TRANSPORT LTD | | | SCAC4 |
| 10 | POXE | POTOMAC XPRESS LLC | | | SCAC4 |
| 11 | POXI | PETRO EXPRESS INC | | | SCAC3 |
| 12 | POXI | POOH TRANS INC | | | SCAC4 |
| 13 | POXL | PETRO OIL TRANSPORT LLC | | | SCAC4 |
| 14 | POXP | POLAR EXPRESS | | | SCAC3 |
| 15 | POXR | PATRIOT EXPRESS, INC | | | SCAC3 |
| 16 | POXR | PATRIOT EXPRESS INC | | | SCAC4 |
| 17 | POXS | PRONTO EXPRESS INC | | | SCAC3 |
| 18 | POXS | PETRO EXPRESS INC | | | SCAC4 |
