The new line runs from the Altstetten railway station, crosses the Zürich HB station throat on a bridge, and leads into the underground Löwenstrasse station. From there, it goes through the new, approximately 5 km (3.1 mi) long Weinberg Tunnel in a long left-hand curve under the existing Zürich HB–Stadelhofen line. It then ends at the level of the portals of the existing Wipkinger Tunnels in Oerlikon, where it connects with the northbound lines, including the line to Zürich Airport and Winterthur.[6]