Not at this time. The manager aboard the CL who was doing the surveys said they used to be able to do it with "available items" but unless they knew the train was running terribly late, they would have no opportunity to order ahead and pick up food. She said it was something they were "figuring out"
When I was on the Silver Meteor a few days ago, I had lunch with a passenger who had been on the Capitol Limited the day before (which I think would have left Chicago on Monday). He stated that the train was running late and in Cumberland, MD, a "Chicken-fil-a" truck brought food to the train. The passenger said a sandwich and cookie was provided to the entire train. I am taking everything that this passenger said with "a grain of salt" since he told me several times that he was provided a boxed salad meal when boarding the train in Chicago for lunch and the same meal for dinner that lunch (which did not make sense to me). He did not like the salad meal, but really liked the "chicken-fil-a."