This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
M line. svg geographically accurate path of the line of the Copenhagen Metro The dashed line represents the extension to Copenhagen Airport that will be finished in en Image line en User Ghent Public domain If anybody does recreate this image as svg please notice that the name of one of the metro stations has recently been changed