| 1 | TTAX | Trailer Train Co. | added 4/1968; 10/1968-1/1980; eliminated 1/1992 | | NAKINA |
| 2 | TTAX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 3 | TTAX | Trailer Train Co. | added 4/1968 | | NAKINA |
| 4 | TTAX | Trailer Train Co. (89'4"" FC flats equipped with container adaptors, trailer hitches and bridge plates. Equipped with hydraulic draft gear) | 10/1968 | | NAKINA |
| 5 | TTAX | Trailer Train Co. (flush deck flat cars equipped with movable foldaway container pedestals, knock-down hitches and bridge plates; for transporting trailers or containers or combinations of both) | 4/1970 | | NAKINA |
| 6 | TTAX | Trailer Train Co. (flush deck flat cars equipped with foldaway container pedestals, knock-down hitches and bridge plates; for transporting trailers or containers or combinations of both) | 1/1975 | | NAKINA |
| 7 | TTAX | Trailer Train Co. (flush deck flat cars equipped with foldaway container pedestals, hitches and bridge plates; for transporting trailers or containers or combinations of both) | 1/1980-7/1985 | | NAKINA |
| 8 | TTAX | Trailer Train Co./TTX Co. (skeletonized, 5-unit, articulated all-purpose car for use between lift-on/lift-off facilities only, capable of carrying various combinations of trailers and/or containers of various lengths and widths) | 10/1991-7/2000 | | NAKINA |
| 9 | TTAX | Trailer Train Co. | added 4/68 | | NRHS |
| 10 | TTAX | Trailer Train Co. (89'4" FC flats equipped with container adaptors, trailer hitches and bridge plates. Equipped with hydraulic draft gear) | Oct-68 | | NRHS |
| 11 | TTAX | Trailer Train Co. | Apr-70 | | NRHS |
| 12 | TTAX | Trailer Train Co. (flush deck flat cars equipped with foldaway container pedestals, knock-down hitches and bridge plates; for transporting trailers or containers or combinations of both) | Jan-75 | | NRHS |
| 13 | TTAX | Trailer Train Co. (flush deck flat cars equipped with foldaway container pedestals, hitches and bridge plates; for transporting trailers or containers or combinations of both) | Jan-80 | | NRHS |
| 14 | TTAX | Trailer Train Co. | eliminated 1/92 | | NRHS |
| 15 | TTAX | TTX Co. | added 1/92 | | NRHS |
| 16 | TTAX | TTX Co. (skeletonized, 5-unit, articulated all-purpose car for use between lift on/lift off facilities only, capable of carrying various combinations of trailers and/or containers of various lengths and widths) | 1/94-7/2000 | | NRHS |
| 17 | TTAX | TTX COMPANY {TRAILER TRAIN COMPANY} | | | PWRC |
| 18 | TTAX | Trailer Train (TTX Corporation) | | | RSRV |
| 19 | TTAX | TTX COMPANY | | | SCAC4 |