Welcome to FlyerTalk!
Even when I'm not logged in, I can see the info on
http://www.amtrakguestrewards.com/redeem...but it's not particularly obvious.
The Wolverine is considered a "Special Route," so a one-way coach trip is 1,000 points, and a one-way business-class trip is 1,500 points. (That's true of any two endpoints on the route.)