Fare category A is generally valid for trips within a city: Category A1 in smaller towns and municipalities; Category A2 in eleven larger towns or cities with a well-developed public transport network: Duisburg, Gelsenkirchen, Hagen, Herne, Krefeld, Mönchengladbach, Mülheim, Neuss/Kaarst, Oberhausen, Remscheid, Solingen; Category A3 in five large cities with very dense and particularly high ...