The U1 is a line of the Hamburg U-Bahn which has a length of . It starts in Norderstedt Mitte and leads via the city center at Jungfernstieg and Hauptbahnhof Süd to Volksdorf where it divides in two branches, leading to Ohlstedt and Großhansdorf and serves 47 stations.
History.
The first part of the line was opened on 1 December 1914 from Kellinghusenstraße to Ohlsdorf with electric service. In 1920, the new branch from Wandsbek-Gartenstadt (Walddörfer railway) to Volksdorf opened; the two branches from here to Großhansdorf and to Ohlstedt followed in 1921 and 1925. Also in 1921, the Langenhorn railway to Ochsenzoll was established. On this line, there had been a preliminary service with steam trains since 1918.
On 2 June 1929 the first part and on 25 March 1931 the second part of the KellJung line to Jungfernstieg was added. From 1960 to 1963 the line was built through the city center to Wandsbek-Gartenstadt, which completed the U1 line, connecting the branch to Volksdorf. In 1969 the Langenhorn railway was extended to Garstedt and in 1996 to Norderstedt Mitte.
References.
 ;templatestyles src="Reflist/styles.css" / ;