| 1 | WRWK | Warwick Ry. Co. | added 1/1974; 1/1975-1/1980; eliminated 1/1983 | | NAKINA |
| 2 | WRWK | Providence and Worcester R.R. Co. | added 1/1983; 1/1994-7/2005 | | NAKINA |
| 3 | WRWK | Warwick Ry. Co. | added 1/74; 1/75-1/80; eliminated 1/83 | | NRHS |
| 4 | WRWK | Providence and Worcester R.R. Co. | added 1/83; 1/94-7/2000 | | NRHS |
| 5 | WRWK | Trinity Rail Management, Inc. | Jul-00 | | NRHS |
| 6 | WRWK | (PW) PROVIDENCE & WORCESTER RAILROAD CO. [WARWICK RAILWAY] | | | PWRC |
| 7 | WRWK | Warwick Railway (Providence and Worcester Railroad) | | | RSRV |
| 8 | WRWL | WESTERN REFINING WHOLESALE INC | | | SCAC4 |
| 9 | WRWR | Warwick Railway | Real: WR | USA | TRAFFIC |
| 10 | WRWS | WASTE RECOVERY WEST INC | | | SCAC4 |
| 11 | WRWX | Trinity Rail Management, Inc. | 7/2000-7/2005 | | NAKINA |
| 12 | WRWX | TRINITY RAIL MANAGEMENT, INC. | | | PWRC |
| 13 | WRWX | Trinity Rail Management | | | RSRV |
| 14 | WRWX | TRINITY RAIL | | | SCAC4 |
