The Moscow Metro (Russian: Московский метрополитен, Moskovsky metropoliten) is a rapid transit system serving a large part of Moscow, Russia as well as the neighbouring city of Krasnogorsk, Moscow oblast. With its first section opening in 1935, it was the first underground railway system in Soviet Union. Most of the system is situated underground, sometimes reaching a depth of more than 60 metres (200 ft) below ground.
There are 182 stations and 301.2 kilometres (187.2 mi) of route length. Moscow Metro is the world's second most heavily used rapid transit system after Tokyo's twin subway.