An Amtrak route that I pre-COVID I rode quite frequently was CHI-SOB generally home from Chicago. I take the South Shore Line there because it's not worth dealing with the unpredictable schedule of the Westbound Capitol and Lake Shore Limiteds, even with today's busitutions.
Anyway in the past even booking these trains same day was never a problem, at most I would get annoyed that the trip would cost $30 instead of $20 because the train was high bucket booked a couple of hours before departure. This has included trips in peak summer months and during holidays.
On Friday I'm presenting at a one day conference in Chicago traveling on buissiness (will take the South Shore in the night before) and have no idea how late I want to stay at the post-conference happy hour before heading home to South Bend. I finally decided to look at Amtrak and confirm that things would be well booking the Capitol Limited same day, and just noticed that coach for the segment from Chicago to South Bend is sold out for the next week (yes a sleeper is avalible for over $300 for a few days but that is not something my job is willing to pay for). Next time you can book a seat is a week from today on the Capitol Limited! The Lake Shore looks like it doesn't have this problem, with the app saying both 49 and 449 are only 70% full.
My office has moved and I no longer see the tracks out my office window (prepandemic I was able to see the Capitol and Lake Shore going through South Bend), just how many fewer coaches the Capitol Limited running now to have such capacity constraints to be sold out for a week, for this one stop ride that generally has decent ridership from South Bend to points east?