Amtrak, and the dots in Minnesota, Wisconsin, and Illinois saw this and added just a second train between Msp And Chicago daily and ridership exploded, trains sold out. A frequent thing that they do to save money is cut trips, but it's doing so much more harm than good. They're now finally realizing that if you want ridership people want options, they want to be able to arrive close to when they want, and some may want to just show up day of and ask when the next train is.
Here in Seattle they just added a 5th or 6th roundtrip to Portland because each time they do, ridership goes up. Turns out there's a lot of people who would rather not drive.