| 1 | NRM | NATIONAL RAILWAYS OF MEXICO (FERROCARRILES NACIONALES DE MEXICO) | | | PWRC |
| 2 | NRMA | NORMANDIN TRANSIT INC | | | SCAC4 |
| 3 | NRMC | NORMAC INC | | | SCAC3 |
| 4 | NRML | NORTON RAMSEY MOTOR LINES INC | | | SCAC3 |
| 5 | NRML | NORTH ARM TRANSPORTATION LTD | | | SCAC4 |
| 6 | NRMO | NORAMCO TRANSPORT CORP | | | SCAC4 |
| 7 | NRMQ | NORMS DELIVERY SERVICE | | | SCAC3 |
| 8 | NRMT | NRM TRUCKING CO | | | SCAC3 |
| 9 | NRMT | NORMAN TRANSPORT INC | | | SCAC4 |
| 10 | NRMX | Merchants Despatch Transportation Corp. | added 7/1962; eliminated 10/1962 | | NAKINA |
| 11 | NRMX | Northern Refrigerator Line, Inc. | added 1/1955; 10/1957-4/1961; eliminated 7/1962 | | NAKINA |
| 12 | NRMX | National Roofing Manufacturing Co. | 7/1937 (not listed) | | NAKINA |
| 13 | NRMX | Northern Refrigerator Line, Inc. | 10/57-4/61 | | NRHS |
| 14 | NRMX | *NATIONAL ROOFING MANUFACTURING CO. | | | PWRC |
| 15 | NRMX | *NORTHERN REFRIGERATOR LINE INC. | | | PWRC |
| 16 | NRMX | +NATIONAL RAILROAD MUSEUM, INC. | | | PWRC |
| 17 | NRMX | NATIONAL RAILROAD MUSEUM INC | | | SCAC4 |
