In a hall at Brussels' Train World museum, two elderly men stood side by side — one a Holocaust  survivor, the other the son of a Nazi  collaborator. The event earlier this week was part of an exhibition exploring the role of Belgian railways during World War II . Organized by the German Embassy in connection with the museum, it was attended by more than 180 students. Koenraad Tinel, 92 (smiling, at left) and Simon Gronowski, 94 (center) were surrounded by students during the discussion at Train World on Monday Image: Hussna Mohamed/DW Simon Gronowski, a 94-year-old lawyer, recalled vividly what happened one morning in March 1943, in Antwerp, Belgium. "It's breakfast time. The bell rings, the three of us look at each other, my sister is in front of me. My mother is on my right. We were paralyzed. All our plans to escape through the back garden were in vain," he said. He and his family ended up taken by the  Gestapo .…