| 1 | MPZ | UP [MISSOURI PACIFIC RAILROAD] | | | PWRC |
| 2 | MPZ | Missouri Pacific Railroad (Union Pacific Railroad) | | | RSRV |
| 3 | MPZ | UNION PACIFIC RAILROAD COMPANY | | | SCAC4 |
| 4 | MPZ | Muzeum Prumyslovych Zeleznic Mladejov | | CZ | TRAFFIC |
| 5 | MPZS | MANTENIMIENTO DE POZOS SA DE CV | | | SCAC4 |
| 6 | MPZX | Mineral Point Zinc Co. | 8/1920-4/1938 | | NAKINA |
| 7 | MPZX | Mineral Point Zinc Division, The New Jersey Zinc Co. | 1/1941-10/1957; eliminated 10/1958 | | NAKINA |
| 8 | MPZX | Mineral Point Zinc Co. | Apr-38 | | NRHS |
| 9 | MPZX | Mineral Point Zinc Division, The New Jersey Zinc Co. | 1/52-10/57; eliminated 10/58 | | NRHS |
| 10 | MPZX | MINERAL POINT ZINC DIV., NEW JERSEY ZINC CO. | | | PWRC |
