When you're in a Tokyo train station, there are plenty of foods to be found. These are just the few I took when we were there. The cheese tarts are very popular but if you're looking for some meat, the dumplings are a good choice. There are also onigiri or rice balls with sea weeds. For sweet lovers, there are more desserts like cream puffs and pastries. For long rides like the Shinkansen or the Skyliner train going to the airport, it's fine to bring food and eat inside the train. Just clean up after you're done.
