The U2 is a line of the Hamburg U-Bahn which has a length of 24.543 kilometres. It serves 25 stations. The line opened in 1913. It starts in Niendorf Nord and leads via the city center at Hauptbahnhof Nord to MĂĽmmelmannsberg. From Wikipedia
Replacement buses extend U3 travel times by up to 20 minutes, while U2 now offers uninterrupted service after two years of construction.