| 1 | ROLX | Empire Railcar Corp. | 7/2005 (not listed) | | NAKINA |
| 2 | ROLX | Robson Leather Co., Ltd. | added 7/1960; 4/1961-4/1970; eliminated 7/1970 | | NAKINA |
| 3 | ROLX | Royal Manufacturing Co. of Duquesne | 1/1945-4/1947 | | NAKINA |
| 4 | ROLX | Robson Leather Co., Ltd. | added 7/60; 4/61-4/70; eliminated 7/70 | | NRHS |
| 5 | ROLX | *ROYAL MANUFACTURING CO. OF DUQUESNE | | | PWRC |
| 6 | ROLX | *ROBSON LEATHER CO., LTD. | | | PWRC |
| 7 | ROLX | +EMPIRE RAILCAR CORP. | | | PWRC |
| 8 | ROLX | ROBSON LEATHER CO LTD | | | SCAC3 |
| 9 | ROLX | EMPIRE RAILCAR CORPORATION | | | SCAC4 |
