| 1 | TTFX | Trailer Train Co. | added 4/1981; eliminated 1/1992 | | NAKINA |
| 2 | TTFX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 3 | TTFX | Trailer Train Co./TTX Co. (assigned lightweight, four platform TOFC car capable of carrying 4 45' trailers. 2 trailers may be equipped with nose-mounted refrigeration units, and the other 2 trailers without nose-mounted reefer units. This intermodal flat is for operation between lift-on/lift-off terminals only) | added 4/1981; 7/1985-1/1994 | | NAKINA |
| 4 | TTFX | Trailer Train Co. | added 4/81; eliminated 1/92 | | NRHS |
| 5 | TTFX | TTX Co. | added 1/92 | | NRHS |
| 6 | TTFX | TTX Co. (lightweight, four platform TOFC car capable of carrying 4 45' trailers. 2 trailers may be equipped with nose-mounted refrigeration units, and the other 2 trailers without nose-mounted reefer units. This intermodal flat is for operation between lift on/lift off terminals only) | Jan-94 | | NRHS |
| 7 | TTFX | TTX COMPANY {TRAILER TRAIN COMPANY} | | | PWRC |
| 8 | TTFX | Trailer Train (TTX Corporation) | | | RSRV |
| 9 | TTFX | TTX COMPANY | | | SCAC4 |