which it would only cross at Turgi. Finally, it was planned to cross the Rhine between Koblenz and Waldshut (then in the nation of Baden) to connect with the planned Baden Mainline between Basel and Konstanz. With an assurance that Alois Negrelli would be direct the engineering and that a branch line would be later built from Baden to Lenzburg and Aarau, the Aargau parliament approved the project in July 1845. The first stage of construction would be the section from Zürich to Baden. Negrelli relocated of the station in Baden to the north side of town, requiring the construction of the 80-meter-long Schlossberg tunnel. Gustav Albert Wegmann designed the Zürich railway station, while Ferdinand Stadler designed the Baden station. At the end of 1845 the Nordbahn company was founded with a share capital of 20 million francs, in the spring of 1846 construction work started. The route for the most part was easy, although there were small landslides between Neuenhof and Baden. The greatest challenge was the construction of the Schlossberg tunnel, where prisoners were initially used for this work, later unskilled workers were also used there. There were three fatalities in a blasting accident and an additional six workers died of typhoid. The tunnel was broken through on 14 April 1847. The line opened on 7 August 1847 with four trips in each direction. The 20 km journey took 45 minutes with the trains stopping at Altstetten, Schlieren and Dietikon. Soon after the opening of the line began to be called the "Spanisch-Brötli bahn" ("Spanish bun railway") because the Zürich gentry sent their servants by train to Baden to buy these pastries in order to impress their clients at Sunday morning teas. The railway was not a commercial success. Its passenger numbers were reduced by the Sonderbund war and the Revolutions of 1848 in neighboring countries. The Nordbahn dropped one of the daily services and indefinitely delayed the construction of further stages. Construction of the branch line from Baden to Lenzburg and Aarau was abandoned. Extension to Brugg and Olten Only after the enactment of the Federal Railways Act of 1852—made possible by the new constitution of 1848—and the merger of the company with Alfred Escher's Lake Constance and Rhine Falls Railway (German: Bodensee und Rheinfallbahnen) to form the Swiss Northeast Railway (German: Schweizerische Nordostbahn, NOB) in 1853 were construction plans resumed. The Baden–Aarau railway was extended to