Japan
total: 23,168 km (15,995 km electrified)
standard gauge: 3,204 km 1.435-m gauge (3,204 km electrified)
narrow gauge: 77 km 1.372-m gauge (77 km electrified); 19,855 km
1.067-m gauge (12,683 km electrified); 31 km 0.762-m gauge (31 km
electrified) (2002)
Jersey
0 km
Jordan total: 505 km narrow gauge: 505 km 1.050-m gauge (2002)
Juan de Nova Island total: NA km; short line going to a jetty
Kazakhstan
total: 13,601 km
broad gauge: 13,601 km 1.520-m gauge (3,661 km electrified) (2002)
Kenya
total: 2,778 km
narrow gauge: 2,778 km 1.000-m gauge (2002)
Kiribati
0 km
Korea, North
total: 5,214 km
standard gauge: 4,549 km 1.435-m gauge (3,500 km electrified)
narrow gauge: 665 km 0.762-m gauge (2002)
Korea, South total: 3,125 km standard gauge: 3,125 km 1.435-m gauge (661 km electrified) (2002)
Kuwait 0 km