The public foot- and cycle path on the Letten- viadukt links the open spaces along the river Limmat with the adjacent quarter Kreis 5. Offering the former railway viaduct as a route for pedestrians and cyclists generates a new viewing angle into the city.
Within the historically listed building struc- ture of the viaduct the route originally built to transport commuters and goods by train is transformed into an important urban connec- tion. Using railway sleepers as a reference, the path consists of longitudinal concrete planks, sometimes aligned with seating elements. The planks are embedded into a gravel layer marking the extend of the original railway tracks.
This loose gravel surface creates spaces for lizards, which occupy the railway viaduct as one of their main habitats.