Electrification
In 1966, Aachen Hauptbahnhof was electrified. Due to its proximity to Belgium, it was decided to implement the switching point from the Deutsche Bahn's 15 kV AC to the 3000 V DC used by the NMBS/SNCB in the station. Tracks 6 to 9 therefore have a switchable catenary and are used for international Thalys, ICE and RegionalExpress services.
Read more about this topic: Aachen Central Station