| 1 | WTTC | WEATHERSBY, TOMMY TRUCKING LLC | | | SCAC4 |
| 2 | WTTD | W & T TRUCKING | | | SCAC4 |
| 3 | WTTE | WATT'S EXPRESS, INC | | | SCAC1 |
| 4 | WTTG | WILKEY, TIM TRUCKING | | | SCAC4 |
| 5 | WTTH | WESTERN TRANSPORTATION SERVICES | | | SCAC4 |
| 6 | WTTK | WATKINS TRUCKING | | | SCAC4 |
| 7 | WTTM | WIEGEL, TONY TRANSFER LLC | | | SCAC4 |
| 8 | WTTQ | WAHLMAN, TIM TRUCKING | | | SCAC4 |
| 9 | WTTS | WHITE TRANSPORTATION SERVICES INC | | | SCAC4 |
| 10 | WTTT | WHITTIER TRANSFER & STORAGE CO | | | SCAC1 |
| 11 | WTTV | WTTS | | | SCAC4 |
| 12 | WTTW | WATT & STEWART TRUCKING INC | | | SCAC4 |
| 13 | WTTX | Trailer Train Co./TTX Co. (standard deck flat cars equipped with 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) | added 4/1982; 7/1985-7/2000 | | NAKINA |
| 14 | WTTX | Wichita Tank Line Co. | 7/1923 | | NAKINA |
| 15 | WTTX | Trailer Train Co. | added 4/1982; eliminated 1/1992 | | NAKINA |
| 16 | WTTX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 17 | WTTX | Trailer Train Co. | added 4/82; eliminated 1/92 | | NRHS |
| 18 | WTTX | TTX Co. | added 1/92 | | NRHS |
| 19 | WTTX | TTX Co. (standard deck flat cars equipped with 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) | 1/94-7/2000 | | NRHS |
| 20 | WTTX | *WICHITA TANK LINE CO. | | | PWRC |
| 21 | WTTX | +TTX COMPANY | | | PWRC |
| 22 | WTTX | Trailer Train (TTX Corporation) | | | RSRV |
| 23 | WTTX | TTX COMPANY | | | SCAC4 |
