The earn side is very straight forward.
Earn 2 points per dollar spent on Amtrak travel. Terms and conditions apply.
Earn a point bonus of 25% for all Business class and 50% for Acela First class travel.
Book Now
https://www.amtrak.com/guestrewards/...ak-travel.html
The burnside as mentioned upthread is dynamic based on the cash price of a ticket.
There used to be zones and flat rate redemptions, but those days are gone.