| Rank | Country | dual gauge | Railways |
| Slovenia | | total: 1,229 km standard gauge: 1,229 km 1.435-m gauge (504 km electrified) (2006) |
| Solomon Islands | | void |
| Somalia | | void |
| South Africa | | total: 20,872 km narrow gauge: 20,436 km 1.065-m gauge (8,931 km electrified); 436 km 0.610-m gauge (2006) |
| South Georgia and the South Sandwich Islands | | void |
| Southern Ocean | | void |
| Spain | | total: 14,974 km broad gauge: 11,919 km 1.668-m gauge (6,950 km electrified) standard gauge: 1,099 km 1.435-m gauge (1,054 km electrified) narrow gauge: 1,928 km 1.000-m gauge (815 km electrified); 28 km 0.914-m gauge (28 km electrified) (2006) |
| Spratly Islands | | void |
| Sri Lanka | | total: 1,449 km broad gauge: 1,449 km 1.676-m gauge (2006) |
| Sudan | | total: 5,978 km narrow gauge: 4,578 km 1.067-m gauge; 1,400 km 0.600-m gauge for cotton plantations (2006) |
| Suriname | | void |
| Svalbard | | void |
| Swaziland | | total: 301 km narrow gauge: 301 km 1.067-m gauge (2006) |
| Sweden | | total: 11,528 km standard gauge: 11,528 km 1.435-m gauge (7,527 km electrified) (2006) |
| Switzerland | | total: 4,839 km standard gauge: 3,561 km 1.435-m gauge (3,195 km electrified) narrow gauge: 1,268 km 1.000-m gauge (1,274 km electrified); 10 km 0.800-m gauge (10 km electrified) (2006) |
| Syria | | total: 2,711 km standard gauge: 2,460 km 1.435-m gauge narrow gauge: 251 km 1.050-m gauge (2006) |
| Taiwan | | total: 1,588 km standard gauge: 345 km 1.435-m gauge narrow gauge: 1,093 km 1.067-m gauge note: 150 km .762-m gauge (belonging primarily to Taiwan Sugar Corporation and Taiwan Forestry Bureau; some to other entities) (2007) |
| 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 |
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This page was last updated on 24 August, 2008 |
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