Trains are also pretty miserable for long distance trips. We took an Amtrak from Chicago to LA once for a family vacation a long time ago. It was so miserable that we flew back.
Got to see a lot of the country, though! I'd like to imagine that trains have gotten more comfortable in the last 20 years, but the realist in me very much doubts that, so I probably won't be doing any long train rides again any time soon.