| 1 | MRRX | Murphy Road Recycling LLC | added 1/2004; 7/2005 | | NAKINA |
| 2 | MRRX | General Electric Railcar Services Corp. | added 1/1984; 1/1994; eliminated 10/1994 | | NAKINA |
| 3 | MRRX | North American Car Corp. | added 7/1955; 10/1957-1/1980; eliminated 1/1984 | | NAKINA |
| 4 | MRRX | Mather Refrigerator Express (Mather Stock Car Co.) | 7/1930-7/1954; eliminated 7/1955 | | NAKINA |
| 5 | MRRX | Mather Refrigerator Express (Mather Horse & Stock Car Co.) | 8/1920-7/1923 | | NAKINA |
| 6 | MRRX | Mather Refrigerator Express (Mather Stock Car Co.) | Apr-38 | | NRHS |
| 7 | MRRX | Mather Stock Car. Co. | 1/52; eliminated 7/55 | | NRHS |
| 8 | MRRX | North American Car Corp. | added 7/55; 10/57-1/80 | | NRHS |
| 9 | MRRX | General Electric Railcar Services Corp. | 1/94; eliminated 10/94 | | NRHS |
| 10 | MRRX | *(NATX) GEN. ELECT. RAILCAR SERVICES CORP. [MATHER REFRIG. EXPRESS (NCCO); MATHER HORSE & STOCK CAR CO.] | | | PWRC |
| 11 | MRRX | *JOHN MORRELL & CO. (NCCO) | | | PWRC |
| 12 | MRRX | +MURPHY ROAD RECYCLING LLC | | | PWRC |
| 13 | MRRX | Murphy Road Recycling | | | RSRV |
| 14 | MRRX | MURPHY ROAD RECYCLING LLC | | | SCAC4 |
