There’s no mention on whether this is good only for future bookings, or whether, for instance, my already-booked circle trip qualifies. The wording of the entire Terms and Conditions is,
"Earn double points on qualifying Amtrak travel from the time of promotion registration through May 22, 2022. Promotional period begins April 4, 2022 and ends May 22, 2022. Must be an Amtrak Guest Rewards member and register for this offer online at
Amtrak.com/DoublePoints to participate. Members must include their membership number when making reservations for travel to qualify. Amtrak Guest Rewards points will not be awarded for cancelled or refunded reservations or tickets. Other terms and conditions may apply.”
Let’s hope so. It seems the qualifying term is “travel,” not “purchases”.