The Sihl passes through the station in a tunnel, with platforms above and below the river, and public circulation areas to either side. The tunnel comprises 5 culverts with a length of 190 metres (623 ft) and a clear opening of 12 metres (39 ft) by 3 metres (10 ft) each. This limits the river's flow capacity, raising concerns about the capacity of the tunnel to deal with extreme flood events.