Stadelhofen Train Station, built in the early 1980s, is a major transportation junction for the Zurich area. The original design consisted of a 300 metres long terminal building, running along a curved railway line, which itself runs along a hillside in the town's centre. In 1990, Santiago Calatrava received the assignment to add a new third track to the existing train station. In order to accomplish this, his design envolved excavating part of the hillside to add the track, only to restore the hillside in part on top of the new structure. This way the new track has an open, naturally lit platform, while above ground space was created for walkways.