| 1 | WHSX | North American Car Corp. | added 7/1966; 10/1966-1/1980; eliminated 1/1984 | | NAKINA |
| 2 | WHSX | General Electric Railcar Services Corp. | added 1/1984; eliminated 7/1986 | | NAKINA |
| 3 | WHSX | North American Car Corp. | added 7/66; 10/66-1/80 | | NRHS |
| 4 | WHSX | General Electric Railcar Services Corp. | eliminated 7/86 | | NRHS |
| 5 | WHSX | GE RAIL SERVICES [NORTH AMERICAN CAR CORP.] | | | PWRC |
| 6 | WHSX | GE Rail Services | | | RSRV |
