"The Verkehrsverbund Rhein-Neckar (VRN) is a transport association covering parts of the German states of Baden-Württemberg, Rhineland-Palatinate and Hesse in south-west Germany. Founded in 1989, it ...
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initially served the Rhein Neckar Area, but has since grown beyond its borders to cover an oblong area of 10,000 km2 with a population of 3 million, including Mannheim and Ludwigshafen, Heidelberg, Kaiserslautern, the entire Palatinate Forest and the northernmost parts of Baden-Württemberg. VRN tickets can also be used for journeys to and from several neighbouring areas, including the French town of Wissembourg." - (en.wikipedia.org 25.10.2023)