Trains can have multiple stops, a possible route would be via Brussels, Rotterdam, Amsterdam and Hamburg. It would have plenty of demand. Berlin itself is one of the hub stations of Europe. You can get a train to almost every European country from there.
Trains can have multiple stops, a possible route would be via Brussels, Rotterdam, Amsterdam and Hamburg. It would have plenty of demand. Berlin itself is one of the hub stations of Europe. You can get a train to almost every European country from there.