[VIDEO] I have some experience with riding in Amtrak First Class/Sleeper especially on a Superliner train. As this lovely couple stated sleeping in the upper bunk will be a bit tight and claustrophobic, I've done it and didn't enjoy it.
If you're out east then a Viewliner sleeper bunk would be best although I have no issue with a bedroom upper bunk on a Superliner, that worked out nice. It was a bit roomy as you're perpendicular to the window as opposed to over the window and parallel with it.
They also suggest what to do if you have a family, especially if you can't afford a family bedroom which is available on a Superliner train.
So you want to know about costs. Roomettes are the cheapest accommodation on a long distance train. Bedrooms have more amenities such as a hand washing sink and toilet/shower and of course more space and in some cases you have more people in your party you can make a suite with another bedroom. There's a door that will allow you access to the other bedroom. However, as Ground Life Travel reports roomettes are half the cost of a bedroom.
There are accommodations for both family and the disabled, I don't know what the cost might be for that. Family bedrooms might be expensive, I can't speak on disabled bedrooms though. And in sleeper class if you want to take a show and don't want to pay for a bedroom, showers are available on a sleeper car. So Bedrooms aren't the only option for that.
