The Danube-Iller Regional S-Bahn (Regio-S-Bahn Donau-Iller) is a "regional" S-Bahn system in the Ulm and Neu-Ulm area.
It operates Regionalbahn services on electrified and non-electrified lines.
Its core is Ulm Hauptbahnhof, which acts as a hub between the regional S-Bahn (RS) lines, other regional services and long-distance services.
[1][2][3] In December 2020, the first two RS lines from Ulm to Memmingen (RS 7) and Weißenhorn (RS 71) were put into operation in the Bavarian part of the Danube-Iller planning region (Region Donau-Iller).
[5] The Danube-Iller Regional S-Bahn is administered by the Donau-Iller-Nahverkehrsverbund GmbH (DING, "Danube-Iller local transport association") and two neighbouring transport associations, the Heidenheimer Tarifverbund ("Heidenheim tariff association") and OstalbMobil ("Ostalb Mobile").