Transport in Luxembourg is ensured principally by road, rail and air. There are also services along the river Moselle which forms the border with Germany. The road network has been significantly modernised in recent years with motorways to adjacent countries. The advent of the high-speed TGV link to Paris has led to renovation of the capital's main railway station while a new Schengen-only passenger terminal at Luxembourg Airport opened in 2017. Trams in the capital were reintroduced in December 2017 and there are plans for light-rail and/or tram-train lines in adjacent areas.
All public transport in Luxembourg (buses, trams, and trains) has been free to use since 29 February 2020, as part of a larger mobility experiment with goals to increase walking for short trips, increase bicycling, and increase the transit ridership sharply as the network is enlarged and service frequency is increased.[1][2][3][4][5][6]