| Rank | Country | standard gauge | Railways |
| Swaziland | | total: 301 km
narrow gauge: 301 km 1.067-m gauge (2006) |
| Tajikistan | | total: 482 km
broad gauge: 482 km 1.520-m gauge (2006) |
| Tanzania | | total: 3,690 km
narrow gauge: 969 km 1.067-m gauge; 2,721 km 1.000-m gauge (2006) |
| Thailand | | total: 4,071 km
narrow gauge: 4,071 km 1.000-m gauge (2006) |
| Timor-Leste | | void |
| Togo | | total: 568 km
narrow gauge: 568 km 1.000-m gauge (2006) |
| Tokelau | | void |
| Tonga | | void |
| Trinidad and Tobago | | void |
| Turkmenistan | | total: 2,440 km
broad gauge: 2,440 km 1.520-m gauge (2006) |
| Turks and Caicos Islands | | void |
| Tuvalu | | void |
| Uganda | | total: 1,244 km
narrow gauge: 1,244 km 1.000-m gauge (2006) |
| Ukraine | | total: 22,473 km
broad gauge: 22,473 km 1.524-m gauge (9,250 km electrified) (2006) |
| United Arab Emirates | | void |
| United States Pacific Island Wildlife Refuges | | void |
| Uzbekistan | | total: 3,950 km
broad gauge: 3,950 km 1.520-m gauge (620 km electrified) (2006) |
| Vanuatu | | void |
| 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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