| 1 | NPLX | North Pacific Lumber Co. | added 10/1979; 1/1980; eliminated 1/1981 | | NAKINA |
| 2 | NPLX | Nickel Plate-Lackawanna Dairy Line | 7/1932 | | NAKINA |
| 3 | NPLX | Nickel Plate-Lackawanna Dairy Line (New York, Chicago & St. Louis R.R. Co.) | 7/1930 | | NAKINA |
| 4 | NPLX | Nickel Plate-Lackawanna Dairy Line (Mid-West Despatch Car Co./Atlantic Seaboard Despatch) | 7/1923 | | NAKINA |
| 5 | NPLX | North Pacific Lumber Co. | 1/80; eliminated 1/81 | | NRHS |
| 6 | NPLX | *NICKEL PLATE-LACKAWANNA DAIRY LINE | | | PWRC |
| 7 | NPLX | *NORTH PACIFIC LUMBER CO. | | | PWRC |
