On 28 May 1972, the Munich S-Bahn network was finally put into service with of tracks and 101 trains of the ET 420 series. Town names in the nearby Munich such as Dachau, Tutzing, Erding and Pasing came into the picture. It was the first time a S-Bahn network that size was put into service on a single date. The route S10 to Wolfratshausen (today S7) was operated with conventional push-pull trains from the southern wing of Munich Central Station. It was electrified later and connected to the core route after the construction of a tunnel crossing the large number of mainline rail tracks leading to Munich Central Station.