| 1 | SDRX | Sinclair Refining Co. | 8/1920-7/1954; eliminated 1/1958 | | NAKINA |
| 2 | SDRX | Union Tank Car Co. | 10/1957; added 1/1958; 4/1961-4/1970; eliminated 7/1973 | | NAKINA |
| 3 | SDRX | Central Puget Sound Regional Transit Authority | 7/2000-7/2005 (not listed) | | NAKINA |
| 4 | SDRX | Sinclair Refining Co. | 4/38-1/52; eliminated 1/58 | | NRHS |
| 5 | SDRX | Union Tank Car Co. | 10/57; added 1/58; 4/61-4/70; eliminated 7/73 | | NRHS |
| 6 | SDRX | Central Puget Sound Regional Transit Authority | Jul-00 | | NRHS |
| 7 | SDRX | *SINCLAIR REFINING CO. (UNION TANK CAR CO.) | | | PWRC |
| 8 | SDRX | +CENTRAL PUGET SOUND REGIONAL TRANSIT AUTHORITY (SEATTLE) | | | PWRC |
| 9 | SDRX | Sounder Commuter Rail | | | RSRV |
| 10 | SDRX | CENTRAL PUGET SOUND REGIONAL TRANSI | | | SCAC4 |
| 11 | SDRX | Sinclair Refining Co. | | USA | TRAFFIC |
