The Schweizerische Nordostbahn (NOB - Director Alfred Escher) received a concession in 1870 for the construction of the railway line "Winterthur - Embrach - Bülach - Koblenz". Start of construction was 1874 and there were an average of 1400 workers, 225 trolleys, and 60 horses used. Most of the workers came from Italy. A railway bridge (metal) near the Haumühle spanned the Wildbach in 1875. It was newly built in 1950 as a stone arch bridge. The Dättenberg was drilled through on 23 October 1875. The tunnel and the whole line opened in 1876. The settlement area Embrach developed as a consequence in a northerly direction. The SBB took over the NOB in 1902.