On one of my recent Amtrak long distance train rides, the Conductor announced at mid point that folk sitting in the sightseeing lounge car should return to their assigned seats. If they did not, their assigned seats would be given to other passengers boarding at the next stop.
No explanation for this was given, just the bare announcement, which was repeated more than once.
Given that passengers are supposed to have a seat reservation, how do they overbook the train?
Apart from the annoyance of giving up a good view, the "take it or leave it" attitude of the Conductor was not appreciated.