The story
Founded by AEG and Siemens & Halske on May 27, 1911, in Hamburg.1
The HHA was founded by Siemens & Halske and AEG as a consortium on 27 May 1911. The first chairman was Albert Ballin.
From 1919 until 1978, the HHA operated a large tram network, and from 5 December 1921 the HHA also operated the first motor buses in Hamburg. After the acquisition of the Straßen-Eisenbahn-Gesellschaft (SEG) in 1919 and the Hamburg-Altonaer-Centralbahngesellschaft AG in 1923, the HHA had a rolling stock of 865 power cars and 930 trailers by 1928. The length of tracks was 217.33 km. In 1970 the length of the lines were only 82.7 km, in 1978 they were 89.5 km with 80 stations.
In 1965, HHA was one of the founding members of the Hamburger Verkehrsverbund (HVV).
From Wikipedia’s article on Hamburger Hochbahn, shared under CC BY-SA 4.0.5
