| 1 | NRMX | Merchants Despatch Transportation Corp. | added 7/1962; eliminated 10/1962 | | NAKINA |
| 2 | NRMX | Northern Refrigerator Line, Inc. | added 1/1955; 10/1957-4/1961; eliminated 7/1962 | | NAKINA |
| 3 | NRMX | National Roofing Manufacturing Co. | 7/1937 (not listed) | | NAKINA |
| 4 | NRMX | Northern Refrigerator Line, Inc. | 10/57-4/61 | | NRHS |
| 5 | NRMX | *NATIONAL ROOFING MANUFACTURING CO. | | | PWRC |
| 6 | NRMX | *NORTHERN REFRIGERATOR LINE INC. | | | PWRC |
| 7 | NRMX | +NATIONAL RAILROAD MUSEUM, INC. | | | PWRC |
| 8 | NRMX | NATIONAL RAILROAD MUSEUM INC | | | SCAC4 |
