| 1 | TTWX | Trailer Train Co. | added 10/1982; eliminated 1/1992 | | NAKINA |
| 2 | TTWX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 3 | TTWX | Trailer Train Co. (flush deck flat cars equipped with movable foldaway container pedestals and collapsible hitches, capable of handling 2 45' dry trailers with 36"" kingpin spacing, at either lift-on/lift-off or end loading facilities using portable bridge plates provided by carrier. | added 10/1982; 7/1985 | | NAKINA |
| 4 | TTWX | Trailer Train Co./TTX Co. (flush deck flat cars equipped with movable foldaway container pedestals and collapsible hitches, capable of handling 2 45' dry trailers with 36"" kingpin spacing, at either lift-on/lift-off or end loading facilities using portable bridge plates provided by carrier, and/or various combinations of 20' and 40' containers. In TOFC service the load limit is 130000 lbs. (65000 lbs. per hitch). In COFC service the load limit is approximately 150000 lbs., depending on the light weight of | 10/1991-7/2000 | | NAKINA |
| 5 | TTWX | Trailer Train Co. | added 10/82; eliminated 1/92 | | NRHS |
| 6 | TTWX | TTX Co. | added 1/92 | | NRHS |
| 7 | TTWX | TTX Co. (flush deck flat cars equipped with movable foldaway container pedestals and collapsable hitches, capable of handling 2 45' dry trailers with 36" kingpin spacing, at either lift on/lift off or end loading facilities using portable bridge plates provided by carrier, and/or various combinations of 20' and 40' containers. In TOFC service the load limit is 130000 lbs. (65000 lbs. per hitch). In COFC service the load limit is approximately 150000 lbs., depending on the light weight of the car) | 1/94-7/2000 | | NRHS |
| 8 | TTWX | TTX COMPANY {TRAILER TRAIN COMPANY} | | | PWRC |
| 9 | TTWX | Trailer Train (TTX Corporation) | | | RSRV |
| 10 | TTWX | TTX COMPANY | | | SCAC4 |
