We just did a trip on the AT in Aug. Yes you can all squeeze in the booth for dinner. We have done it the last few trip. This trip DH and ODS sat across from us- which gave us more room.
Dinner time is 5/7/9pm. I hear you on feeding the kids late. We have ocassionally gotten the 9pm seating. The 1st time we showed up the staff was mad (well not really but upset) that we let the kids wait. Ours were falling asleep by the time dessert was served. DH is employeed by amtrak so we are suppose to get last seating time. We usually arrive at the station by 11 am and lately have gotten a 5pm serving but the train is not sold out (which makes a difference). Last yr trip we had the 7 pm seating. The cabin attendant was able to get us our food served in our room- on china too. we just explained that the time was pretty late for the kids and he was very accomadating in getting the food by 6pm. We do travel with snacks/juice packs for this purpose.
As for menu selections. If I remember correctly there was crab cakes (soo good we had them down and back) a steak, a chicken and I want to say there was a pasta too. The kids menu was cho cho chewy- chicken tenders with green beans and mac/chees. wine/soda/juice is available. Dessert was cheesecake w or w/o icecream, ice cream, jello and a to die for very chocolate cake. the food is very good.
Breakfast is very early but we usually tend to get up at 630 to see where the train is in terms of arrival. We do eat by 7am. They have the booths set up with muffins, bagels, banana, and cereal(frosted flakes, raisin bran and I want to say special K but I could be wrong on that). OJ is already on the table. Coffee/tea is also available. One yr Dh brought breakfast back to the room (we had 2) bc it was easier w/ ds1 at the time. He took everyone else w/ him. The train generally arrives in Sanford by 830 unless there was some type of delay. They do close the dining room by 8ish if they are arriving early. Also we were advised to arrive early so we could all sit together.
the sleeper cars do have a coffee/tea station in each. It is avail for the duration of your trip. They had hot chocolate too. Each room also has bottles of water available. They will give u more if u ask. There is a seperate dining car for sleepers and for coach.
We did bring our own pillows and blankets since we don't know if we are coach or sleepers until they are calling last call all aboard! They were handy this time in the sleepers. I shared the bed w/ dd7 and she hogged the blankets. The upper bunks may have a vent close to it so it might be chilly up there. I know there is a little deflection piece that can be pulled down to vent it away from the top bunks.
You will be on the lower level of the train. There are 3 different types of bathrooms. DD and I investigated it one year! 1st is your tradition one- very narrow- think airline bathroom, 2nd has a dressing room attached -basically has a seat to sit on to change and then the little bathroom off that. 3rd is more of a makeup area w/ stools and a big mirror and a little bathroom off that. We found the one with the dressing room attached the easiest bc it gave us more room plus a place to sit while waiting for dc to do their thing. the train is rocky so it is important to hold on or in this case you have an extra seat to sit on.
I also found for traveling w/ a 1yr old to wear him in a baby carrier. I have a pikkolo carrier (buckled structured carrier). The train does sway -sometimes alot. You really need to have your hands free to support yourself. With the carrier it made it easier to walk about the train w/o worry of dropping him or losing my balance. Moving btwn cars is very bumpy. DH and i have a long running joke that when the tracks were layed the workers must have been drinking too much!!
I hope this helps. Let me know if you have any more ?'s. We have traveled the last 6 yrs on the AT and absolutely love it. Currently my dc range in ages 20 - 3.
OH the best suggestion I could give about the AT is to remember it is part of the adventure. Be prepared for delays- it can happen. The tracks are owned by CSX and Amtrak has to grant CSX the right of way. Delays can and do happen. Our return train this year was delayed about an hr at the station due to issues with the brakes on some of the cars. Fine with us as long as it is fixed bf we get on board. in 08 our return train was cancelled due to tropical storm fay. We had the option to drive home (NOT) or stay at WDW till the next train that could accomadate us (5 days later). We dont' get upset if there is a delay- we just come prepared. For our DC the train is the best experience next to disney!