| Rank | Country | dual gauge | Railways |
| 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 |
| Chile | | total: 6,585 km broad gauge: 2,831 km 1.676-m gauge (1,317 km electrified) narrow gauge: 3,754 km 1.000-m gauge (2006) |
| 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 |
| Congo, Democratic Republic of the | | total: 5,138 km narrow gauge: 3,987 km 1.067-m gauge (858 km electrified); 125 km 1.000-m gauge; 1,026 km 0.600-m gauge (2006) |
| Congo, Republic of the | | total: 894 km narrow gauge: 894 km 1.067-m gauge (2006) |
| Cook Islands | | void |
| Coral Sea Islands | | void |
| Costa Rica | | total: 278 km narrow gauge: 278 km 1.067-m gauge note: none of the railway network is in use (2007) |