| Rank | Country | narrow gauge | Railways |
| Niue | | void |
| Norfolk Island | | void |
| Northern Mariana Islands | | void |
| Norway | | total: 4,114 km
standard gauge: 4,114 km 1.435-m gauge (2,552 km electrified) (2008) |
| Oman | | void |
| Pacific Ocean | | void |
| Palau | | void |
| Papua New Guinea | | void |
| Paracel Islands | | void |
| Paraguay | | total: 36 km
standard gauge: 36 km 1.435-m gauge (2006) |
| Pitcairn Islands | | void |
| Poland | | total: 23,072 km
broad gauge: 629 km 1.524-m gauge
standard gauge: 22,443 km 1.435-m gauge (20,555 km operational; 11,910 km electrified) (2006) |
| Qatar | | void |
| Rwanda | | void |
| Saint Barthelemy | | void |
| Saint Helena | | void |
| Saint Lucia | | void |
| Saint Martin | | void |
| Saint Pierre and Miquelon | | void |
| Saint Vincent and the Grenadines | | void |
| Samoa | | void |
| San Marino | | void |
| Sao Tome and Principe | | void |
| Saudi Arabia | | total: 1,392 km
standard gauge: 1,392 km 1.435-m gauge (with branch lines and sidings) (2006) |
| Serbia | | total: 3,379 km
standard gauge: 3,379 km 1.435-m gauge (electrified 1,254 km) (2006) |
| Seychelles | | void |
| Sierra Leone | | void |
| Singapore | | void |
| Slovenia | | total: 1,229 km
standard gauge: 1,229 km 1.435-m gauge (504 km electrified) (2006) |
| Solomon Islands | | void |
| Somalia | | void |
| South Georgia and the South Sandwich Islands | | void |
| Southern Ocean | | void |
| Spratly Islands | | void |
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This page was last updated on 29 November, 2008 |
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