Yes, you can claim Amtrak Guest Rewards points for trips you have already taken, provided you do so within 120 days of your travel date. If you forgot to include your member number when booking, you can log into your account on the Amtrak website or mobile app and navigate to the "Request Missing Points" section. You will need to provide your reservation number (PNR) or ticket number to verify the travel. It is important to wait at least 7 days after your trip before submitting the request, as it can take a full week for the system to process travel records. For new members, there is a "retroactive" window of 21 days; you can claim points for any Amtrak travel taken in the three weeks prior to your enrollment date. Note that points are only awarded to the person who actually traveled, regardless of who paid for the ticket. If the name on the reservation does not exactly match the name on your rewards profile, you may need to call Amtrak customer service at 1-800-307-5000 to have the points manually credited to your account.