http://www.raileurope-world.com/train-tickets/journey-insights/article/cologne-brusselsИ вообще здесь https://www.google.ru/search?q=train+from+cologne+to+brussels&rlz=1C9BKJA_enRU595RU595&oq=train+from+cologne+to+brussels&aqs=chrome..69i57j0l3&sourceid=chrome-mobile&espv=1&ie=UTF-8&hl=ru