Metro, Tram and Commuter are only operated in Helsinki areas, including Espoo and Vantaa.

• Metro: giving you fastest moving between East Helsinki and Helsinki center. There are 16 metro stops and it takes only 20 minutes to travel from the begining stop to the last stop.
• Tram: providing you moving around Helsinki center. There are 10 trams which launches to most of common places in Helsinki center.
• Commuter: also called local rail, helping you moving Helsinki - Vantaa or Helsinki - Espoo.

Website http://www.ytv.fi/eng gives you the good way to find your routes in Helsinki areas.