| 1 | FTX | General American Transportation Corp. | added 4/1955; eliminated 7/1955 | | NAKINA |
| 2 | FTX | Frontier Tank Car Co. | 1/1952-7/1954; eliminated 4/1955 | | NAKINA |
| 3 | FTX | Federal Tank Line | 8/1920-7/1923 | | NAKINA |
| 4 | FTX | Frontier Tank Car Co. | 1/52; eliminated 4/55 | | NRHS |
| 5 | FTX | General American Transportation Corp. | added 4/55; eliminated 7/55 | | NRHS |
| 6 | FTX | *FEDERAL TANK LINE | | | PWRC |
| 7 | FTX | *GENERAL AMERICAN TRANSPORTATION CORP. [FRONTIER TANK CAR CO.] | | | PWRC |
| 8 | FTXA | FALCO TEXOMA LLC | | | SCAC4 |
| 9 | FTXB | FAB TRANSPORTATION INC | | | SCAC4 |
| 10 | FTXC | FELTS TRANSPORT LLC | | | SCAC4 |
| 11 | FTXD | FORST TRANSFER INC | | | SCAC4 |
| 12 | FTXE | FORTONS EXPRESS INC | | | SCAC4 |
| 13 | FTXG | FRONTIER TRANSPORT LOGISTICS | | | SCAC4 |
| 14 | FTXH | FLEET TRANSPORTATION | | | SCAC4 |
| 15 | FTXI | FLA-TEX INC | | | SCAC3 |
| 16 | FTXJ | FTX INC | | | SCAC3 |
| 17 | FTXJ | FOUR T (4T) TRANSPORTATION INC | | | SCAC4 |
| 18 | FTXK | F & T AUTO TRANSPORT LLC | | | SCAC4 |
| 19 | FTXL | FURTEX LEASING INC | | | SCAC3 |
| 20 | FTXM | FATHER TRANSPORT INC, THE | | | SCAC4 |
| 21 | FTXO | FREDS TOWING AND TRANSPORT INC | | | SCAC4 |
| 22 | FTXR | FLEET EXPRESS | | | SCAC4 |
| 23 | FTXU | FTX CONSULTING SERVICES, INC | | USA | BIC |
| 24 | FTXW | FER TRANSPORT INC | | | SCAC4 |
| 25 | FTXY | FTX LLC | | | SCAC4 |
