The new section of the New Western Railway begins at the exit of Wien Meidling station and runs through the Lainz Tunnel, which leads directly to Hadersdorf junction. Up to that point the traditional link to and from the Old Western Railway can be operated at 160 km/h. The start of the high-speed line at the entrance of the Vienna Woods Tunnel is west of Hadersdorf junction. From this point, the line can be run at up to 250 km/h. The line resurfaces after 13 km at Chorherrn near to the Tulln Basin.