| Rank | Country | narrow gauge | Railways |
| Kazakhstan | | total: 15,079 km broad gauge: 15,079 km 1.520-m gauge (4,000 km electrified) (2010) |
| Kiribati | | void |
| Korea, North | | total: 5,242 km standard gauge: 5,242 km 1.435-m gauge (3,500 km electrified) (2009) |
| Korea, South | | total: 3,381 km standard gauge: 3,381 km 1.435-m gauge (1,843 km electrified) (2008) |
| Kosovo | | total: 430 km standard gauge: 430 km 1.435-m gauge (2007) |
| Kuwait | | void |
| Kyrgyzstan | | total: 470 km broad gauge: 470 km 1.520-m gauge (2010) |
| Laos | | void |
| Lesotho | | void |
| Libya | | void |
| Liechtenstein | | total: 9 km standard gauge: 9 km 1.435-m gauge (electrified) note: belongs to the Austrian Railway System connecting Austria and Switzerland (2011) |
| Lithuania | | total: 1,767 km broad gauge: 1,745 km 1.524-m gauge (122 km electrified) standard gauge: 22 km 1.435-m gauge (2010) |
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This page was last updated on 2 February, 2012 |
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