| Rank | Country | broad gauge | Railways |
| Togo | | total: 568 km
narrow gauge: 568 km 1.000-m gauge (2006) |
| Tokelau | | void |
| Tonga | | void |
| Trinidad and Tobago | | void |
| Tunisia | | total: 2,153 km
standard gauge: 471 km 1.435-m gauge
narrow gauge: 1,674 km 1.000-m gauge (65 km electrified)
dual gauge: 8 km 1.435 m and 1.000-m gauges (three rails) (2006) |
| Turkey | | total: 8,697 km
standard gauge: 8,697 km 1.435-m gauge (1,920 km electrified) (2006) |
| Turks and Caicos Islands | | void |
| Tuvalu | | void |
| Uganda | | total: 1,244 km
narrow gauge: 1,244 km 1.000-m gauge (2006) |
| United Arab Emirates | | void |
| United States | | total: 226,612 km
standard gauge: 226,612 km 1.435-m gauge (2005) |
| United States Pacific Island Wildlife Refuges | | void |
| Uruguay | | total: 2,073 km
standard gauge: 2,073 km 1.435-m gauge
note: 461 km have been taken out of service and 460 km are in partial use (2006) |
| Vanuatu | | void |
| Venezuela | | total: 682 km
standard gauge: 682 km 1.435-m gauge (2006) |
| Vietnam | | total: 2,600 km
standard gauge: 178 km 1.435-m gauge
narrow gauge: 2,169 km 1.000-m gauge
dual gauge: 253 km three-rail track combining 1.435 m and 1.000-m gauges (2006) |
| Virgin Islands | | void |
| Wake Island | | void |
| Wallis and Futuna | | void |
| West Bank | | void |
| Western Sahara | | void |
| World | | total: 1,370,782 km (2006) |
| Yemen | | void |
| Zambia | | total: 2,157 km
narrow gauge: 2,157 km 1.067-m gauge
note: includes 891 km of the Tanzania-Zambia Railway Authority (TAZARA) (2006) |
| Zimbabwe | | total: 3,077 km
narrow gauge: 3,077 km 1.067-m gauge (313 km electrified) (2006) |
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