For about a decade, beginning in the 1890s, Wagner was involved in engineering projects. As adviser to the Transport Commission in Vienna, Wagner was occupied with the construction of the Stadtbahn, the city's metropolitan railway network. Not only did he design bridges and tunnels for this system, but he also designed the stations, with their complex of platforms, staircases, and ticket offices. Many of these stations survive today. The old entrance pavilions to the former Karlsplatz Stadtbahn station, particularly elegant with their marble slabs and gilded ornamentation, were carefully restored.