| 1 | WTLX | Washington Tank Car Co. | 8/1920 | | NAKINA |
| 2 | WTLX | White Tank Line | 7/1930-7/1932 | | NAKINA |
| 3 | WTLX | Western Tank Line | 4/1947-1/1950 | | NAKINA |
| 4 | WTLX | Wilmot Transportation & Logistics Ltd. | added 1/2004; 7/2005; eliminated 4/2007 | | NAKINA |
| 5 | WTLX | WT&L Corp. | added 4/2007 | | NAKINA |
| 6 | WTLX | *WASHINGTON TANK CAR CO. | | | PWRC |
| 7 | WTLX | *WHITE TANK LINE | | | PWRC |
| 8 | WTLX | *WESTERN TANK LINE | | | PWRC |
| 9 | WTLX | +WT&L CORP. [WILMOT TRANSPORTATION & LOGISTICS LTD.] | | | PWRC |
| 10 | WTLX | WILMOT TRANSPORTATION & LOGISTICS L | | | SCAC4 |
