broad gauge: 1,328 km 1.520-m gauge (1992)
Monaco: total: 1.7 km
standard gauge: 1.7 km 1.435-m gauge
Mongolia: 1,815 km
broad gauge: 1,815 km 1.524-m gauge (2001)
Montserrat:
0 km
Morocco:
total: 1,907 km
standard gauge: 1,907 km 1.435-m gauge (1,003 km electrified; 540
km double track)
Mozambique:
total: 3,131 km
narrow gauge: 2,988 km 1.067-m gauge; 143 km 0.762-m gauge (1994)