over the past 15 years there has always been trouble (robbing, drunken people, etc) in night-trains crossing the polish - german border, when using 2nd class sitting car.
I got robbed in 1999 on a night train crossing the Polish-German border between Dresden and Legnica. Actually I was GASSED. Woke up with a dreadful headache, with my jacket pockets slashed by a scalpel. The window wide open to vent the carriage. Oh, and dowidzenia my laptop with a week of work...
I am 100% convinced the train crew was in on it all, and perhaps even assisted in the crime. First, they refused to give me a couchette and then acted very coy when I asked if the trains were safe. They looked like shifty little b*ggers and I should have been more suspicious. Scum of Poland. Even today I would not hesitate to kill them on sight (if I could get away with it).
But then I was silly enough to sit alone in a carriage. NEVER, EVER SIT ALONE AT NIGHT IN A POLISH TRAIN CARRIAGE. It was the first time I'd ever been robbed and I've travelled a long, long way in my days. Makes me sick just recalling the whole thing.
My advice - these b*ggers target foreigners, so don't make it obvious that you are one (difficult to do only 10 years ago, but not so hard today). Use the day trains, they're very, very much safer. Avoid long distance night trains unless you can sleep in a couchette or sit in a large car with other people.