Previously, there were two local trains and one express train per hour between Groningen and Leeuwarden. These trains could no longer transport the growing number of passengers during rush hour. Therefore, a new train connection has been constructed, allowing passengers to travel quickly and comfortably between the northern cities. ProRail has adapted the tracks between Groningen and Leeuwarden to make space for the extra train within the timetable. An improvement for travellers and for the mobility in the north of the Netherlands.