I've seen questions about whether or not a meal can be booked in the station lounge when meal time is soon after boarding. I just checked into the lounge in Chicago Union Station to wait for my 6:40 Capitol Limited trip to Pittsburgh and the attendant asked me if I wanted to book my dinner. I did, of course! By the way, I came into Chicago on Dec 1 on the Capitol from Pittsburgh and the car attendant told me the dining car would be open for breakfast from 6 a.m. to 8 a.m. first come first served. He offered to wake me, but forgot. However I still got to the dining car by 6:30, which was good because it actually closed for new seatings before I finished eating.