Amtrak's refund policy is available at http://www.amtrak.com/servlet/Conten...=1093553975057

In short, for most tickets, you can get a voucher for its full value, or a refund minus a 10% processing fee, up to a year after issued. Special rules apply for accommodations/upgrades. It used to be the case you could get a full refund provided the ticket had not been printed, but perhaps that has changed.