The first tram route serving the station forecourt, was a horse tram line that ran from Promenadenplatz to Maillingerstraße and was opened on 21 October 1876. Over the next few years, the horse tram network was expanded and by 1900, four tram routes served the station. The network was electrified and further expanded and by 1938, nine routes served Hauptbahnhof, which had become one of the focal points of the Munich tram system. By 1966, Hauptbahnhof was served by ten tram routes. In the years following, the number of trams and routes in Munich declined, mostly as a result of the construction of the U-Bahn, but they continued to serve Hauptbahnhof, albeit with frequent route number changes and with the number of services serving the station increasing to eleven at one point.