The long-distance Amtraks are more like a rolling hotel or land cruise-ship in some ways. Highly recommended if you have the time - https://www.amtraktrains.com is worth the research, as Amtrak's ticketing system is literally a 70s airline ticketing system and if you learn how to play it you can get sleeper car reservations for relatively cheap.
You can also find destinations that would otherwise be moderately difficult to reach - for example the Empire Builder stops at East Glacier in Montana from spring to fall - extremely small town with wonderful hiking, etc.
You can also have a quite interesting "explore America" trip in both countries with some planning (a travel agent can actually help here if they're knowledgeable) - as you can break the trip up into "daytime travel", stay in a city like Chicago for a few days, and then "overnight" to the next city.
You can also find destinations that would otherwise be moderately difficult to reach - for example the Empire Builder stops at East Glacier in Montana from spring to fall - extremely small town with wonderful hiking, etc.
Here's a song about a similar route in Canada: https://www.youtube.com/watch?v=YXcfRlEGJko
https://www.viarail.ca/en/explore-our-destinations/trains/ro...
You can also have a quite interesting "explore America" trip in both countries with some planning (a travel agent can actually help here if they're knowledgeable) - as you can break the trip up into "daytime travel", stay in a city like Chicago for a few days, and then "overnight" to the next city.