| 1 | TTUX | Trailer Train Co. | added 7/1983; eliminated 1/1992 | | NAKINA |
| 2 | TTUX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 3 | TTUX | Trailer Train Co./TTX Co. (single platform TOFC cars with single axle trucks and rigid hitch, capable of carrying one trailer 40' to 48' long and up to 102"" wide, with nose-mounted refrigeration unit between lift-on/lift-off facilities only) | added 7/1983; 7/1985-1/1994 | | NAKINA |
| 4 | TTUX | Trailer Train Co. | eliminated 1/92 | | NRHS |
| 5 | TTUX | TTX Co. | added 1/92; 1/94 | | NRHS |
| 6 | TTUX | TTX COMPANY {TRAILER TRAIN COMPANY} | | | PWRC |
| 7 | TTUX | Trailer Train (TTX Corporation) | | | RSRV |
| 8 | TTUX | TTX COMPANY | | | SCAC4 |
