| 1 | DTTX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 2 | DTTX | Trailer Train Co. | added 1/1985; eliminated 1/1992 | | NAKINA |
| 3 | DTTX | Trailer Train Co./TTX Co. (well-type COFC cars, capable of carrying double-stacked containers) | added 1/1985; 7/1985-1/1994 | | NAKINA |
| 4 | DTTX | TTX Co. (well-type cars, capable of carrying double-stacked containers, and in some cases trailers) | 7/2000 | | NAKINA |
| 5 | DTTX | Trailer Train Co. | added 1/85; eliminated 1/92 | | NRHS |
| 6 | DTTX | TTX Co. | added 1/92 | | NRHS |
| 7 | DTTX | TTX Co. (well-type COFC cars, capable of carrying double-stacked containers) | Jan-94 | | NRHS |
| 8 | DTTX | TTX Co. (well-type cars, capable of carrying double-stacked containers, and in some cases trailers) | Jul-00 | | NRHS |
| 9 | DTTX | TTX COMPANY | | | PWRC |
| 10 | DTTX | Trailer Train (TTX Corporation) | | | RSRV |
| 11 | DTTX | TTX COMPANY | | | SCAC4 |