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 city's railway station while a new passenger terminal at Luxembourg Airport has recently been opened. Trams in the capital were reintroduced in December 2017 and there are plans for light-rail lines in adjacent areas.