| Rank | Country | standard gauge | Railways |
| Liechtenstein | | 9 km 1.435-m gauge (electrified)
note: belongs to the Austrian Railway System connecting Austria and Switzerland (2006) |
| Macau | | void |
| Madagascar | | total: 854 km
narrow gauge: 854 km 1.000-m gauge (2006) |
| Malawi | | total: 797 km
narrow gauge: 797 km 1.067-m gauge (2006) |
| Maldives | | void |
| Mali | | total: 729 km
narrow gauge: 729 km 1.000-m gauge (2006) |
| Malta | | void |
| Marshall Islands | | void |
| Mauritius | | void |
| Mayotte | | void |
| Micronesia, Federated States of | | void |
| Monaco | | void |
| Mongolia | | total: 1,810 km
broad gauge: 1,810 km 1.524-m gauge (2006) |
| Montserrat | | void |
| Mozambique | | total: 3,123 km
narrow gauge: 2,983 km 1.067-m gauge; 140 km 0.762-m gauge (2006) |
| Namibia | | total: 2,382 km
narrow gauge: 2,382 km 1.067-m gauge (2006) |
| Nauru | | void |
| Navassa Island | | void |
| Nepal | | total: 59 km
narrow gauge: 59 km 0.762-m gauge (2006) |
| Netherlands Antilles | | void |
| New Caledonia | | void |
| New Zealand | | total: 4,128 km
narrow gauge: 4,128 km 1.067-m gauge (506 km electrified) (2006) |
| Nicaragua | | total: 6 km
narrow gauge: 6 km 1.067-m gauge (2006) |
| Niger | | void |
| Nigeria | | total: 3,505 km
narrow gauge: 3,505 km 1.067-m gauge (2006) |
| Niue | | void |
| Norfolk Island | | void |
| Northern Mariana Islands | | void |
| Oman | | void |
| Pacific Ocean | | void |
| Pakistan | | total: 8,163 km
broad gauge: 7,718 km 1.676-m gauge (293 km electrified)
narrow gauge: 445 km 1.000-m gauge (2006) |
| Palau | | void |
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