| 1 | WSOC | WOSCA TRANSPORTATION SERVICES | | | SCAC1 |
| 2 | WSOC | WHITE STONE CALCIUM INC | | | SCAC4 |
| 3 | WSOG | WILSON LOGISTICS INC | | | SCAC4 |
| 4 | WSOI | WHITE STAR OIL | | | SCAC4 |
| 5 | WSOL | WALSH OIL COMPANY INC | | | SCAC4 |
| 6 | WSON | WILSON OIL INC | | | SCAC4 |
| 7 | WSOQ | WST COOP TRANSPORT | | | SCAC4 |
| 8 | WSOR | Wisconsin & Southern R.R. Co. | added 10/1980; 1/1994-7/2005 | | NAKINA |
| 9 | WSOR | Wisconsin & Southern R.R. Co. | added 10/80; 1/94-7/2000 | | NRHS |
| 10 | WSOR | WISCONSIN & SOUTHERN RAILROAD COMPANY | | | PWRC |
| 11 | WSOR | Wisconsin and Southern Railroad | | | RSRV |
| 12 | WSOR | WISCONSIN & SOUTHERN RAILROAD COMPA | | | SCAC4 |
| 13 | WSOR | Wisconsin & Southern Railroad | | USA | TRAFFIC |
| 14 | WSOX | Wisconsin & Southern Leasing Co. | added 7/1981; eliminated 1/1991 | | NAKINA |
| 15 | WSOX | Upper Merion and Plymouth Leasing Co. | added 1/1991; 1/1994 | | NAKINA |
| 16 | WSOX | Upper Merion and Plymouth Co. | eliminated 4/1996 | | NAKINA |
| 17 | WSOX | First Union Rail | added 4/1996; 7/2000-7/2005 | | NAKINA |
| 18 | WSOX | Wisconsin & Southern Leasing Co. | added 7/81; eliminated 1/91 | | NRHS |
| 19 | WSOX | Upper Merion and Plymouth Leasing Co. | added 1/91; 1/94 | | NRHS |
| 20 | WSOX | Upper Merion and Plymouth Co. | eliminated 4/96 | | NRHS |
| 21 | WSOX | First Union Rail | added 4/96; 7/2000 | | NRHS |
| 22 | WSOX | FIRST UNION RAIL [(UMPX) UPPER MERION AND PLYMOUTH LEASING CO.; WISCONSIN & SOUTHERN LEASING CO.] | | | PWRC |
| 23 | WSOX | Wisconsin and Southern Leasing | | | RSRV |
| 24 | WSOX | FIRST UNION RAIL | | | SCAC4 |
| 25 | WSOZ | (WSOR) WISCONSIN & SOUTHERN RAILROAD COMPANY | | | PWRC |
| 26 | WSOZ | Wisconsin and Southern Railroad | | | RSRV |
| 27 | WSOZ | WISCONSIN & SOUTHERN RAILROAD | | | SCAC4 |
