The M3 route AKA Cityringen is the red line stopping at 17 stations in inner Copenhagen

On 29 September Copenhagen finally opened the doors to the long-awaited metro line Cityringen (The City Cirle/Ring). The project has been under construction for the past 10 years, where it has been part of the daily life for citizens of Copenhagen.
The opening of Cityringen comes with 17 new metro stations mostly covering the center of Copenhagen, which will make life easier and greener for locals and tourist.