That sounds pretty darned cool. How long does the train trip take? Never thought of doing it this way. Getting off the train with my car in tow would be fun.
Both ways, it departs at 4pm, and (IF ALL GOES WELL) arrives the next morning at 9am.
You need to be at the departing station no later than 2ish. After 2:30 you're SOL so give yourself plenty of travel time, they will not let a car board, barring cars on line to board when 2:30 hits.
There are no additional stops along the route except for an overnight stop in (I think) South Carolina to refuel, get fresh water, probably pump out the septics. At that point, anyone on the train who needs a smoke can go outside and light 'em up but the entire train itself is non-smoking.
They have 3 dinner seatings - 5, 7, 9. When you arrive at the departing station you pick your time so there's always a chance your preferred time will be "sold out." Breakfast is more of a first-come-first-serve deal but they do a pretty good job flipping the tables and getting everyone in. And since it's just a continental breakfast, and people want to get their stuff together for departure, they usually don't linger.
There are sleeper cars available but they can bring the cost up significantly. Some are very small, basically 2 seats facing side to side with a wall and door, and at night the 2 seats slide together for one bed, and a "bunk" folds out from up top. Others are bigger, some include a private toilet/shower.
If you opt for "just a coach seat," it's going to be significantly bigger than any coach seat on any plane, significantly more leg room.
Aside from the dining car there is also a lounge car for drinks, very simple food (reheated burgers and pizzas and pretzels, stuff like that), they show movies on TV, people play cards all night, it can be neat.
Each person can bring 2 bags with them, so if you can't go to sleep without a favorite pillow and blanket, pack it.
Some people love it. Some "snow birds" do it all the time, go back to Flrodia for the winter with their car with them. Some people find it too slow and don't like trying to sleep around so many strangers. You'll never know until you try. You can always try it just one way and then, if you like it and if space is still available, book it for the return.
Oh, one more thing - for an extra $30 (for now) you can pay to have your car be amongst the first 30 to be pulled out from storage.