I work in the food service industry, (incubator kitchen manager) and have been curious for some time now, which agency of government would be responsible for food licensing, and food preparation inspection of dining cars on long distance trains? A few years back, on a long distance train, we went through a dry county ( no alcohol served) and wine and beer sales were suspended while in that county. So local laws apply for that. But obviously it would be difficult to inspect every dining car, and every crew that passes through a state. I am guessing maybe FDA?