Outside the northeast corridor and a few others, there are many Amtrak trains are only once a day, or less, and often with long routes. It's unfortunate. The network is pretty good in terms of coverage / states covered on the map (since it's optimized for that), but lots of places it's pretty much impractical to use because the one time/day doesn't work.

I really wish they could at least get to a minimum of two trains, a "day" and "night" train on every route. You'd think the marginal cost would be minimal considering all the track/stations are there anyway!