Metro (Underground/ Tube) is an alternative to the ground public transport. It is a quick way to get to another part of a city. No traffic jams and only two-and-a-half-minute break between trains during the daytime.
Here Russia-InfoCentre presents metro line maps for the largest Russian cities: Moscow, Saint Petersburg, Yekaterinburg, Nizhny Novgorod, Novosibirsk, Samara, Kazan, and Volgograd. This can help you to plan your journey and to select the best out of all possible routes to get to your destination.