"I'm indifferent to the AMFLEETs, but I'd go for full-scale AMTRAK high-level cars.
Just finished an 8000+ mile trip aboard AMTRAK and w0uld love to have at least one example of the experience."
You need to check out the GGD website and they have just what you are looking for that was announced earlier this year. There may be an issue, however, due to lack of orders for the Amtrak cars. The Sante Fe version look like a big winner.