I did when I was a kid and it was awful. It was fun for the first few hours, but then it got really boring, and it was really, really long. If you are dead set on it, I'd spring for a sleeper car, trying to sleep in regular coach train seats is like sleeping on an airplane, but they didn't dim the inside lights. Maybe they've improved the food, but when I went it wasn't great, and it was expensive. The bathrooms got pretty gross also. I am a fan of train travel, but if you want the experience, I'd take one of the luxury train vacations they offer, and not Amtrak. If you are going to spend all that money, fly down, then you'll be there much quicker, less tired and not unshowered in yesterdays clothes.