| Rank | Country | dual gauge | Railways |
1 | Brazil | 396 | total: 29,295 km broad gauge: 4,932 km 1.600-m gauge (939 km electrified) standard gauge: 194 km 1.440-m gauge narrow gauge: 23,773 km 1.000-m gauge (581 km electrified) dual gauge: 396 km 1.000 m and 1.600-m gauges (three rails) (78 km electrified) (2006) |
2 | Vietnam | 253 | 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) |
3 | Australia | 230 | total: 38,550 km broad gauge: 3,727 km 1.600-m gauge standard gauge: 20,519 km 1.435-m gauge (1,877 km electrified) narrow gauge: 14,074 km 1.067-m gauge (2,453 km electrified) dual gauge: 230 km dual gauge (2006) |
4 | Greece | 23 | total: 2,571 km standard gauge: 1,565 km 1.435-m gauge (764 km electrified) narrow gauge: 961 km 1.000-m gauge; 22 km 0.750-m gauge dual gauge: 23 km combined 1.435 m and 1.000-m gauges (three rail system) (2006) |
5 | Tunisia | 8 | 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) |
| Afghanistan | | void |
| Akrotiri | | void |
| Albania | | total: 447 km standard gauge: 447 km 1.435-m gauge (2006) |
| Algeria | | total: 3,973 km standard gauge: 2,888 km 1.435-m gauge (283 km electrified) narrow gauge: 1,085 km 1.055-m gauge (2006) |
| American Samoa | | void |
| Andorra | | void |
| Angola | | total: 2,761 km narrow gauge: 2,638 km 1.067-m gauge; 123 km 0.600-m gauge (2006) |
| Anguilla | | void |
| Antarctica | | void |
| Antigua and Barbuda | | void |
| Arctic Ocean | | void |
| Argentina | | total: 31,902 km broad gauge: 20,858 km 1.676-m gauge (141 km electrified) standard gauge: 2,885 km 1.435-m gauge (26 km electrified) narrow gauge: 7,922 km 1.000-m gauge; 237 km 0.750-m gauge (2006) |
| Armenia | | total: 839 km broad gauge: 839 km 1.520-m gauge (828 km electrified) note: some lines are out of service (2006) |
| Aruba | | void |