| Rank | Country | broad gauge | Railways |
| 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) |
| Cameroon | | total: 987 km
narrow gauge: 987 km 1.000-m gauge (2006) |
| Canada | | total: 48,068 km
standard gauge: 48,068 km 1.435-m gauge (2006) |
| Cape Verde | | void |
| Cayman Islands | | void |
| Central African Republic | | void |
| Chad | | void |
| China | | total: 75,438 km
standard gauge: 75,438 km 1.435-m gauge (20,151 km electrified) (2005) |
| Christmas Island | | void |
| Clipperton Island | | void |
| Cocos (Keeling) Islands | | void |
| Colombia | | total: 3,304 km
standard gauge: 150 km 1.435-m gauge
narrow gauge: 3,154 km 0.914-m gauge (2006) |
| Comoros | | void |
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