Martinique
0 km
Mauritania 717 km standard gauge: 717 km 1.435-m gauge (2002)
Mauritius
0 km
Mayotte
0 km
Mexico total: 19,510 km standard gauge: 19,510 km 1.435-m gauge (2002)
Micronesia, Federated States of 0 km
Moldova
total: 1,300 km
broad gauge: 1,300 km 1.520-m gauge (2002)
Monaco
total: 1.7 km
standard gauge: 1.7 km 1.435-m gauge (2002)
Mongolia
1,815 km
broad gauge: 1,815 km 1.524-m gauge (2002)
Montserrat
0 km