| Rank | Country | dual gauge | Railways |
| Monaco | | void |
| Mongolia | | total: 1,908 km broad gauge: 1,908 km 1.520-m gauge note: the railway is 50 percent owned by the Russian State Railway (2010) |
| Montenegro | | total: 250 km standard gauge: 250 km 1.435-m gauge (169 km electrified) (2010) |
| Montserrat | | void |
| Morocco | | total: 2,067 km standard gauge: 2,067 km 1.435-m gauge (1,022 km electrified) (2010) |
| Mozambique | | total: 4,787 km narrow gauge: 4,787 km 1.067-m gauge (2010) |
| Namibia | | total: 2,626 km narrow gauge: 2,626 km 1.067-m gauge (2010) |
| Nauru | | void |
| Navassa Island | | void |
| Nepal | | total: 59 km narrow gauge: 59 km 0.762-m gauge (2010) |
| Netherlands | | total: 2,896 km standard gauge: 2,896 km 1.435-m gauge (2,195 km electrified) (2010) |
| New Caledonia | | void |
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This page was last updated on 2 February, 2012 |
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