Amtrak advertises its “experience” on its website, specifically stating that “it’s about more than just getting from place to place” and describing on-board amenities.Amtrak is a transportation company, not a tourist train. They got you from Chicago to Seattle, which is what they supposed to do. Remember, taxpayers help fund Amtrak. I certainly do not want my taxes funding a tourist train.
I suspect the sightseer lounge car was "bad ordered" at the last minute - the car was not road worthy and they did not have another one available.
As others said, you could ask for some compensation, but they will not, and should not be expected to, refund your fare. They will probably offer you a small voucher for future use.
Even the commuter railroad Metro-North had lounges until recently.Amtrak advertises amenities including dining cars and lounges. I’m not sure how a lounge makes a train a tourist train. All the classic long distance trains offered multiple types of lounge cars. They were definitely not tourist trains.