| Rank | Country | Railways |
16 | Mexico | total: 17,665 km standard gauge: 17,665 km 1.435-m gauge (2006) |
| Micronesia, Federated States of | void |
85 | Moldova | total: 1,138 km broad gauge: 1,124 km 1.520-m gauge standard gauge: 14 km 1.435-m gauge (2006) |
| Monaco | void |
77 | Mongolia | total: 1,810 km broad gauge: 1,810 km 1.524-m gauge (2006) |
127 | Montenegro | total: 250 km standard gauge: 250 km 1.435-m gauge (electrified 169 km) (2006) |
| Montserrat | void |
75 | Morocco | total: 1,907 km standard gauge: 1,907 km 1.435-m gauge (1,003 km electrified) (2006) |
54 | Mozambique | total: 3,123 km narrow gauge: 2,983 km 1.067-m gauge; 140 km 0.762-m gauge (2006) |
67 | Namibia | total: 2,382 km narrow gauge: 2,382 km 1.067-m gauge (2006) |
| Nauru | void |
| Navassa Island | void |
131 | Nepal | total: 59 km narrow gauge: 59 km 0.762-m gauge (2006) |
56 | Netherlands |  total: 2,797 km standard gauge: 2,797 km 1.435-m gauge (2,064 km electrified) (2006) |
| Netherlands Antilles | void |
| New Caledonia | void |
39 | New Zealand | total: 4,128 km narrow gauge: 4,128 km 1.067-m gauge (506 km electrified) (2006) |
134 | Nicaragua | total: 6 km narrow gauge: 6 km 1.067-m gauge (2006) |
| Niger | void |
48 | Nigeria | total: 3,505 km narrow gauge: 3,505 km 1.067-m gauge (2006) |
| Niue | void |
| Norfolk Island | void |
| Northern Mariana Islands | void |
40 | Norway |  total: 4,114 km standard gauge: 4,114 km 1.435-m gauge (2,552 km electrified) (2008) |
| Oman | void |
| Pacific Ocean | void |
25 | 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 |
122 | Panama | total: 355 km standard gauge: 77 km 1.435-m gauge narrow gauge: 278 km 0.914-m gauge (2006) |
| Papua New Guinea | void |