Hi Tony -
We took the Auto Train from Lorton, Virginia (about 15 miles south of DC) to Sanford, Florida (a few miles north of Orlando) and back, several years ago and thoroughly enjoyed the trip.
The cars are stored in separate enclosed car carrier cars that are attached to the end of the train.
Passengers have a choice of coach seating or roomettes.
The train leaves in the late afternoon - around 4 p.m. I believe, and arrives at the destination fairly early the next morning - around 7 or 8 a.m. I think.
There is a bar car with movies on video screens and a full assortment of drinks.
Dinner is included in the fare (at least for roomette passengers - not sure about coach). There is a nice selection of three or four entrees (including filet mignon) and unlimited wine is included.
There is also a continental breakfast served the next morning.
If you go during daylight savings time you get four or five daylight hours to enjoy the scenery. We went at Christmas time and it was nice seeing all the decorated houses along the way.
I highly recommend the Auto Train, although it is a litttle pricy - well over $1,000 (round trip for two people in a roomette and the car).