Amtrak is offering a free roundtrip trip on a Northeast regional train after two roundtrips or four one-ways on same between January 7, 2010 and March 13, 2010. Registration is required.
Up to 8 free trips can be earned, and will be valid for use between June 1 and August 31.
They’ve basically outlawed straight mileage running for the promo by limiting folks to one qualifying roundtrip per day, and by imposing a minimum qualifying fare of $49 each way.
Finally the terms and conditions also state, “Other terms and conditions apply.” But of course they don’t tell you what those other terms and conditions are. I suspect there really aren’t any, but they’re covering themselves, this is a program with a history of making significant changes without notice — I don’t really trust Amtrak Guest Rewards, but it’s better for there to be a program for the occasional obligatory train trip than for there to be no program at all.
Ultimately this wouldn’t sway me away from flying the route, but if you’re going to take the train anyway you should certainly register.