I always stop by when I go to chicago. I have the biggest crush on one of the waitresses ????????
If you are waiting for your metra train, you don't have too many options, but luckily "Choo Chews" offers decent and cheap (if mildly humiliating) food. I really don't think it's necessary to make the waitstaff say "All aboard!" (they might as well have been saying "Save me from this purgatory") as they send your food off on the train. Half the people eating there were tired travelers waiting for the train and I don't think they appreciated it very much (I certainly didn't).
Wonderful atmosphere. Model trains drive around overhead and the food comes out of the kitchen on a train as well. Friendly staff and cheap prices. The food is decent, especially for the price.