I remember in the summer of 89 having to wait several hours in Uzhhorod for exactly this reason. I don't remember if they kicked us of the train or if we wanted to use the opportunity to do some sightseeing, but there were no sights to see in Uzhhorod in 1989. The most notable thing we found was a local "wall of shame": a display case with pictures of local miscreants, together with the listings of their crimes. Being at the height of Gorbachev's prohibition, the most common crime was "drinking alcoholic beverages in public". I think that if I had to live in Uzhhorod in late 1980's, I would probably end up drinking alcoholic beverages in public as well.