Russian Revolution, Vladimir Lenin, traveled from Zurich via Stuttgart to Petrograd in a special train. The line also gained in importance in terms of freight service, and in 1897 the Royal Württemberg State Railways already carried 400,000 tonnes of freight on the Gäubahn. Initially, the freight was largely made up of agricultural goods from the rich agrarian area of the Gäu, but soon industrial areas sprang up alongside the railway, which then used the Gäubahn to transport their goods. The Royal Württemberg State Railways started to lay a second track alongside the originally single-track railway on short sections of the line in the 1880s and 1890s. In 1886, the first section to be made into a twin-track line was the 4.4-kilometer-long piece between Horb am Neckar and Eutingen im Gäu, which was shared between the Gäubahn and Nagoldtalbahn. In 1895, the 8.6-kilometer-long section between Stuttgart Hauptbahnhof and Stuttgart Westbahnhof, which was closed in 1993, received a second track. Extension and heyday of the Gäubahn (1919–1945) In the period between World War I and World War II, the transport infrastructure in Germany received numerous improvements. On 22 October 1922, the new main station in Stuttgart (Stuttgart Hauptbahnhof) was officially opened. This removed the chokepoint at the terminus of the Gäubahn and enabled the expansion of the capacity of rail traffic. Once the new station was open for service, the Deutsche Reichsbahn altered the route taken by the Gäubahn in the center of Stuttgart, which avoided the station Stuttgart Nordbahnhof. In the 1920s, the Free People's State of Württemberg, as Württemberg was known during the Weimar Republic, undertook to expand the single-track lines constructed in the 19th century. The goal was to enable rail traffic from Berlin to Switzerland and Italy to utilize not just the railways in the neighboring territories of Baden and Bavaria, but also to use the Gäubahn, and therefore tracks owned by Württemberg. In addition, the Reichswehr had an interest in a high-capacity rail connection between Berlin and the southwestern border, which, particularly after the return of Alsace-Lorraine to France in 1918, was not as close to the French border as the Rhine Valley Railway from Mannheim to Basel, and would not be as easy to disrupt in the event of war. The occupation of the city of Offenburg by French troops in 1923 reinforced the desire for an effective and efficient Gäubahn. On the 23 and 24