I’ve previously recommended the credit card issued by Chase in conjunction with the Amtrak Guest Rewards frequent-rider program as one of the best frequent-traveler credit cards, depending on whether you travel regularly on Amtrak, and if so on which routes. It has high fees for foreign transactions, cash advances, or interest if you don’t pay your bill each month and use it as a credit card rather than a charge card. But for domestic use as a charge card, I’ve found it the best deal available for some years.
Unlike almost all the cards affiliated with airline frequent-flyer programs, the Chase/Amtrak Guest Rewards card has no annual fee. And if you use your points for Amtrak tickets in the Northeast Corridor or the California Corridors, you can get “free” tickets equal in value to about 3% of the amount you charge on the card, which matches or exceeds the best of the cash-rebate cards.