This article on Amtrak Sleeper Cars is an excellent place for you to start your research on Amtrak long-distance trains' accommodations.
You can find a Viewliner roomette on Amtrak's eastern route trains. Although similar to Superliners, these roomettes are slightly different.
Eating is essential, even when you are traveling. This article covers the necessary information on what you should know about Amtrak Café Cars.
This article briefly overviews Amtrak's long-distance trains and includes the old Amtrak Long-Distance Route Guides, which were once available on trains.