Martinique:
0 km
Mauritania:
total: 750 km (single track); note - owned and operated
by government mining company
standard gauge: 750 km 1.435-m gauge (1995)
Mauritius:
0 km
Mayotte:
0 km
Mexico:
total: 31,048 km
standard gauge: 30,958 km 1.435-m gauge (246 km electrified)
narrow gauge: 90 km 0.914-m gauge (1998 est.)
Micronesia, Federated States of:
0 km
Moldova:
total: 1,328 km