| Rank | Country | dual gauge | Railways |
| Ashmore and Cartier Islands | | void |
| Atlantic Ocean | | void |
| Austria | | total: 6,383 km
standard gauge: 5,924 km 1.435-m gauge (3,772 km electrified)
narrow gauge: 371 km 1.000-m gauge; 88 km 0.760-m gauge (25 km electrified) (2006) |
| Azerbaijan | | total: 2,122 km
broad gauge: 2,122 km 1.520-m gauge (1,278 km electrified) (2006) |
| Bahamas, The | | void |
| Bahrain | | void |
| Bangladesh | | total: 2,768 km
broad gauge: 946 km 1.676-m gauge
narrow gauge: 1,822 km 1.000-m gauge (2006) |
| Barbados | | void |
| Belarus | | total: 5,512 km
broad gauge: 5,497 km 1.520-m gauge (874 km electrified)
standard gauge: 15 km 1.435 m (2006) |
| Belgium | | total: 3,536 km
standard gauge: 3,536 km 1.435-m gauge (2,950 km electrified) (2006) |
| Belize | | void |
| Benin | | total: 758 km
narrow gauge: 758 km 1.000-m gauge (2006) |
| Bermuda | | void |
| Bhutan | | void |
| Bolivia | | total: 3,504 km
narrow gauge: 3,504 km 1.000-m gauge (2006) |
| Bosnia and Herzegovina | | total: 608 km
standard gauge: 608 km 1.435-m gauge (2006) |
| Botswana | | total: 888 km
narrow gauge: 888 km 1.067-m gauge (2006) |
| Bouvet Island | | void |
| British Indian Ocean Territory | | void |
| British Virgin Islands | | void |
| Brunei | | void |
| Bulgaria | | total: 4,294 km
standard gauge: 4,049 km 1.435-m gauge (2,710 km electrified)
narrow gauge: 245 km 0.760-m gauge (2006) |
| Burkina Faso | | total: 622 km
narrow gauge: 622 km 1.000-m gauge
note: another 660 km of this railway extends into Cote D'Ivoire (2006) |
| Burma | | total: 3,955 km
narrow gauge: 3,955 km 1.000-m gauge (2006) |
| Burundi | | void |
| Cambodia | | total: 602 km
narrow gauge: 602 km 1.000-m gauge (2006) |
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