Interesting, thank you!

Curiously, on Sept. 16 there are 256 of 256 seats available in Business (zero sold), and on May 13 there are 252 of 256 seats available (4 sold). At the same time, there are allegedly 51 value seats available for Sept. 16 and 21 for May 13.
At least, according to the JSON Amtrak serves on the departure.html "Select Your Trip" page, which may not be reliable (and I don't know what the available seats by fare class numbers mean after the October fare model changes).