The Starnberg wing station was affected by the construction of the S-Bahn trunk line from 1967 because the trunk line was built under it. The trunk line and the new underground station were taken into operation on 28 April 1972 in time for the 1972 Summer Olympics. During the Summer Olympics the station had a high volume of passengers. On 2 September 1972, there were, for example, 35,000 passengers, excluding S-Bahn operations. The first U-Bahn lines, U8/U1 (now U2/U1) commenced operations through the station on 18 October 1980. As a further development of the S-Bahn, the line to Wolfratshausen as S-Bahn line S 7 was connected to the trunk line with a 260-metre-long tunnel under all the tracks on 31 May 1981. Until then the S-Bahn trains to and from Wolfratshausen, then called line S 10, ended and started in Holzkirchen wing station. The U-Bahn platform on lines U4/U5 opened on 10 March 1984. In the 1980s, the entrance building was converted under the leadership of Ekkehard Fahr, Dieter Schaich and Josef Reindl into a circulating hall with a travel centre in order to create a transparent and open environment. In the timetable of the summer of 1989, the station was the twelfth largest node in the network of Deutsche Bundesbahn, with 269 arrivals and departures by scheduled long-distance services per day.