The industrial areas in the Copenhagen suburbs are next in line for urban development. A new light rail is planned to interconnect 20 development zones with a total area of 11 Km2, the size of the entire inner city. We are proposing to turn the light rail line into a spine of dense urbanity with a series of peaks at the stations. By combing the rail with strategies for energy exchange, waste management, water treatment and electric car stations, the infrastructure could become the base for a new sustainable ring of development around Copenhagen, and an artery of true urbanity pumping life into the heart of the suburbs. At certain points the rail becomes a building itself almost like a Roman aqueduct passing through the suburbs, at other points it forms small pockets of urbanity around the stations.