I was planning to add the Empire Builder to my completed routes list but the fares are running between double and triple the pre-Anderson prices for objectively worse service and fewer amenities. Maybe there are some days with better rates but thanks to Amtrak's clumsy website and crackdown on third party tools there is no easy way to find out.
I take a western train from LA, EMY or SEA to Chicago end of Aug or early Sept each year on way back to Florida. Have to fly somewhere instead so cannot make that train trip this year but I checked prices anyway in late February or March and found EB bedroom on a few dates in early September were just under $800 I believe. It was the western train to CHI with best price for a bedroom.
I am still taking the Cardinal CHI to DC in a roomette at ok price and then a Silver back to Florida in a bedroom at not such a great price second week of Sept. Silver prices are always high though, I have points and didn't want a roomette.