From the point of intersection Gleisdreieck each led a track branch to the west, north and east.
As of March 25, 1902, after the commissioning of the southern tracks of the Gleisdreieck, trains drove from the Stralauer Tor to the Zoologischer Garten.
This oddity, and the fact that the two-line network was simple to navigate anyway, caused line designations to be gradually abandoned there over the years.
In March 1966, West Berlin abandoned the Roman numeral system and instead replaced by the route numbering system that is in place: After the construction of the Berlin Wall initially only the two sections Schlesisches Tor – Warschauer Brücke (continue to the border in the West as a parking facility continue to use) and Thälmannplatz - Gleisdreieck (the route from the underground station Potsdamer Platz to Thälmannplatz was from the BVG East as On 1 January 1972, the section Gleisdreieck - Wittenbergplatz line 2 / route A was shut down for economic reasons.
In both halves of the city, the existing large-profile routes were extended several times, the small profile was a "clip" between the lines 3 and 4 (Wittenbergplatz and Viktoria-Luise-Platz) discussed.
The leases at Nollendorfplatz and Bülowstraße stations, which had been repurposed as a flea market and a Turkish bazaar meant for storing the last West Berlin trams, expired in March 1991.
The connecting to this network small profile routes in the west of Berlin, the line numbers 3, 4 and temporarily assigned to 5.
This route was taken into account during the construction of the community station under the Alexanderplatz as a construction advance and therefore received the designation line F. The West Berlin Senate pursued the old plans for the line F even after the division of the city, so that further Vorratsbauten the now planned to Steglitz route F emerged.
The until 1920 independent city Schöneberg had built for their opened on December 1, 1910 route from Nollendorfplatz to Innsbrucker Platz (then: main street) in the Eisackstraße own operating workshop.
The first line-connecting operating routes were created during the conversion of the Gleisdreieck from previously regular railway tracks.
Already a year before the accident of 1908, the Hochbahngesellschaft had decided to make the Gleisdreieck in the sense of today's construction to a crossing station and to lead a relief route over the Kurfürstenstraße to Nollendorfplatz.
It branches off north of the station Heinrich-Heine-Straße and leads, after it had been further developed as a connecting tunnel D / E, in a stump track of the sweeper of the U5 (former line E) west of Alexanderplatz.
In order to be able to service their small-profile vehicles in the Friedrichsfelde workshop, the BVG-Ost needed a connection from the A- to the E-line leading there.
[4] Between the stations Elsterwerdaer place and Wuhletal represents at the U5 a three-track aboveground plant a connection to the railway network.
The older connection was at the station Warsaw bridge between the elevated railroad tracks and the flat railway line.
The second connection existed in 1988 between the workshop Friedrichsfelde and the tram line in the street Am Tierpark and was abandoned in 1996.
Track changes are located in front of some terminal stations to allow trains to turn at the platform.
The small-profile factory workshops Schöneberg (1932), Warsaw Bridge (1961) and Krumme Lanke (1968) were abandoned.