Yesterday we were on the ICE to Brussels. Part of a long trip that involved 7 trains of 6 different companies, but surprisingly every single train was on time.
But for the American family sitting across the aisle the trip did not go as well as for us. While the train was stopped in Liege someone get one, grabbed a backpack from the overhead bin and left again. It was over in seconds. The guy was quick we couldn't even describe him afterwards. In stead of continuing to Brugge they now had to detrain to file a police report. And then somehow get new passports...
So watch your stuff. I believe the guy had help, and that they specifically scoped out US tourists.