I don't know why, but it sounds like fun. Long dark night on the train, drinking with you're buddies 'til the sun comes up. Sounds like an ideal trip to me.
Do they have trains journeys in America that take like 12 hours to complete? To changes obviously, 'cause changes ruin things.
The longest journey I've done is the sleeper from Inverness to London. Not sure how long it took but I think it was around 10 hours. That was fun but just not as cool as I think the ones in America would be.
Think of all the cool characters you'd meet along the way!
I'm rambling now...