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While the Cologne-Minden Railway Company (Cöln-Mindener Eisenbahn-Gesellschaft, CME) was building its trunk line between Cologne and Minden via Duisburg between 1843 and 1847, the shareholders of the Ruhrort-Crefeld District Gladbach Railway Company (Ruhrort–Crefeld−Kreis Gladbach Eisenbahngesellschaft, RCG) were looking for a way to bring coal from the Ruhr to industries on the western bank of the Rhine cheaply.
A name for the Trunk line operator requested in pre-Subscriber trunk dialling telephone systems by a subscriber calling the local operator - British usage
Connection to an upgraded AKN-trunk line via Henstedt-Ulzburg and Kaltenkirchen would create a Kiel–Hamburg Airport–Hamburg line, allowing connections between many parts of Schleswig-Holstein and the airport.
Alternatively, and ultimately selected, was construction of a tunnel eastwards from Oslo to Lillestrøm and an upgrade of the Trunk Line and a new route from a point at Asper to the airport.
Because the S-Bahn trunk line passes under the Isar between the stations of Isartor and Rosenheimerplatz just to the east of the station, both tubes are fitted with flood gates so that the tunnel can be sealed watertight, so that in the event of flooding of the Isar the stations lying to the west are not also flooded.