| 1 | WWR | Washington Western | 1/1975-1/1980 | | NAKINA |
| 2 | WWR | Washington Western | 1/75-1/80 | | NRHS |
| 3 | WWR | WASHINGTON WESTERN RAILWAY | | | PWRC |
| 4 | WWR | Washington Western | | | RSRV |
| 5 | WWRC | Wilmington & Western Ry. Corp. | added 7/1985; eliminated 1/1993; 1/1994-7/2005 | | NAKINA |
| 6 | WWRC | Wilmington & Western Ry. Corp. | eliminated 1/93; 1/94-7/2000 | | NRHS |
| 7 | WWRC | WILMINGTON & WESTERN RAILROAD CORPORATION | | | PWRC |
| 8 | WWRC | Wilmington and Western Railroad | | | RSRV |
| 9 | WWRF | WORLD WIDE RACING FUELS LLC | | | SCAC4 |
| 10 | WWRN | WHITE WATER RENTALS LLC | | | SCAC4 |
| 11 | WWRX | WHITE WATER RAILROAD, INC. | | | PWRC |
