Most stations consist of a single island platform. At the interchange stations "Hauptbahnhof" and "Altona" there are two island platforms, one for trains to the city centre and one for the other direction. At "Neugraben" and "Pinneberg" termini the two S-Bahn tracks are between a side platform and an island platform, on the other side of which regional rail trains stop. Side platforms are at the triple-track stations at "Bergedorf", "Berliner Tor (lower level)", "Blankenese" and "Harburg Rathaus", the twin-track station at "Billwerder-Moorfleet" and at the only single-track station, "Iserbrook".