Update: The current sign-up bonus for the Amtrak Guest Rewards World MasterCard is 12,000 points after spending $500 in the first 3 months, 2 points per dollar spent on Amtrak, and one point per dollar on everything else.
If you don’t currently have an Amtrak Guest Rewards account but will be using Amtrak within the next 90 days, they are now offering an additional 500 point bonus if you sign up using this link. Amtrak is also offering triple points from May 7-21, 2011:
“Ready to spring ahead with Amtrak Guest Rewards®? You only have two weeks left to book your Amtrak® travel through the Spring Ahead promotion. When you do, the Northeast RegionalSM, Acela® and any other Amtrak travel will earn you triple points starting May 7 through May 21, 2011.”
There is no registration link, but you can sign into your amtrakguestrewards.com account and select the bonus or call 1-800-307-5000.