Amtrak Guest Rewards members can earn double points on all trains, every time you travel on Amtrak from Sept. 14 through Dec. 19, 2009. You must register online before travel at http://www.amtrakguestrewards.com/view/91409 or call (800) 307-5000 (option 2) and use registration code 91409. There is a limit of two qualifying trips per day (one roundtrip or two one-ways) and Amtrak Guest Rewards members must include their membership number when making reservations.