The first Swiss railway line, the
Zürich–Baden railway (known as the
Spanisch-Brötli-Bahn) was opened by the
Swiss Northern Railway on 9 August 1847. It was planned to continue the line via Turgi, through the lower Aare valley to
Koblenz and along the
Rhine to
Basel. However, this initially failed due to financial difficulties. In 1850, a national council commission with the help of the English railway engineer
Robert Stephenson recommended, among other things, that the connection between Zurich and Basel should not run via Koblenz, but instead via Olten. Therefore, the
Swiss Northeastern Railway (
Schweizerische Nordostbahn) planned the continuation from Baden along the Limmat to Turgi, then along the Aare to Aarau. The Baden–Brugg section was opened on 30 September 1856 and the extension to Aarau was opened on 15 May 1858. The line was initially completely single-track, as was the Spanisch-Brötli-Bahn. Doubing of the Zürich–Turgi line was completed in 1861 and it was extended to Aarau in 1862. The electrification with the usual
Swiss Federal Railway (SBB) system of
15 kV 16 2/3 Hz was completed on 21 January 1925. Until the nationalisation of the large private railway companies to form the SBB, the Northeastern Railway was responsible for the operation of the line. For more than 100 years—until the opening of the
Heitersberg line in 1975—this was the main east-west transversal of the Swiss railway network. However, the
Bözberg railway line was opened in 1875, which allowed a shorter connection between Zurich and Basel than the Aarau–Olten–
Hauenstein line. The originally planned line between Zürich and Basel via Koblenz was also built: it was opened between Turgi and Koblenz in 1859 and extended via
Laufenburg to Basel in 1892. == References ==