ICE Trains from Germany to Belgium:
ICE Trains arrive and depart from Brussels South Station and Liège Guillemins Station. They connect with many large German cities such as Aachen, Berlin, Frankfurt, Hannover, Köln, Munich etc.
High Speed Trains from Germany to Belgium:
There is a Thalys high speed train line connecting Dortmund,Essen, Duisburg, Dusseldorf, Köln, Aachen with Liège and Brussels.
For more information and tickets visit https://www.thalys.com/de/en
Flights from Berlin to Brussels:
Ryanair offers flights from Berlin Schoenefield Airport to Brussels Zaventem Airport. Brussels Airlines offers flights from Berlin Tegel airport to Brussels Zaventem Airport.
Flights from Hamburg to Brussels:
Brussels airlines has a direct flight from Hamburg to Brussels Zaventem Airport