| Rank | Country | standard gauge | Railways |
| Guinea-Bissau | | void |
| Guyana | | void |
| Haiti | | void |
| Heard Island and McDonald Islands | | void |
| Holy See (Vatican City) | | void |
| Honduras | | total: 699 km narrow gauge: 279 km 1.067-m gauge; 420 km 0.914-m gauge (2006) |
| Hong Kong | | void |
| Iceland | | void |
| India | | total: 63,221 km broad gauge: 46,807 km 1.676-m gauge (17,343 km electrified) narrow gauge: 13,290 km 1.000-m gauge (165 km electrified); 3,124 km 0.762-m gauge and 0.610-m gauge (2006) |
| Indian Ocean | | void |
| Indonesia | | total: 6,458 km narrow gauge: 5,961 km 1.067-m gauge (125 km electrified); 497 km 0.750-m gauge (2006) |
| Ireland | | total: 3,237 km broad gauge: 1,872 km 1.600-m gauge (37 km electrified) narrow gauge: 1,365 km 0.914-m gauge (operated by the Irish Peat Board to transport peat to power stations and briquetting plants) (2006) |
| Jamaica | | void |
| Jan Mayen | | void |
| Jersey | | void |
| Jordan | | total: 505 km narrow gauge: 505 km 1.050-m gauge (2006) |
| Kazakhstan | | total: 13,700 km broad gauge: 13,700 km 1.520-m gauge (3,700 km electrified) (2006) |
| Kenya | | total: 2,778 km narrow gauge: 2,778 km 1.000-m gauge (2006) |
| Kiribati | | void |
| Kosovo | | total: 430 km (2005) |
| Kuwait | | void |
| Kyrgyzstan | | total: 470 km broad gauge: 470 km 1.520-m gauge (2006) |
| Laos | | void |
| Latvia | | total: 2,303 km broad gauge: 2,270 km 1.520-m gauge (257 km electrified) narrow gauge: 33 km 0.750-m gauge (2006) |
| Lesotho | | void |
| Libya | | 0 km note: Libya has announced plans to build seven lines totaling 2,757 km of 1.435-m gauge track (2006) |
| Liechtenstein | | 9 km 1.435-m gauge (electrified) note: belongs to the Austrian Railway System connecting Austria and Switzerland (2006) |