Actually, Amtrak practice airliner pricing with different prices for the same service on the same train, depending on how far ahead you’ve bought the ticket and some other mysterious factors. For example, I just checked a coach seat on the Coast Starlight from Los Angeles to Seattle.
Thursday, July 1, it’s $248
Thursday, July 8, it’s $126 with the note One left at this price.
Thursday, August 12 it’s $101 with no note.
Thursday, September 2 (another pre-holiday) it’s still $101